CN116014361A - Lithium battery diaphragm, lithium battery and preparation method - Google Patents
Lithium battery diaphragm, lithium battery and preparation method Download PDFInfo
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- CN116014361A CN116014361A CN202310055526.9A CN202310055526A CN116014361A CN 116014361 A CN116014361 A CN 116014361A CN 202310055526 A CN202310055526 A CN 202310055526A CN 116014361 A CN116014361 A CN 116014361A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 147
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 145
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 81
- 238000000576 coating method Methods 0.000 claims abstract description 81
- 238000005524 ceramic coating Methods 0.000 claims abstract description 48
- 239000003792 electrolyte Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims abstract description 3
- CVJYOKLQNGVTIS-UHFFFAOYSA-K aluminum;lithium;titanium(4+);phosphate Chemical compound [Li+].[Al+3].[Ti+4].[O-]P([O-])([O-])=O CVJYOKLQNGVTIS-UHFFFAOYSA-K 0.000 claims description 42
- -1 polyethylene Polymers 0.000 claims description 29
- 239000011267 electrode slurry Substances 0.000 claims description 28
- 239000006258 conductive agent Substances 0.000 claims description 20
- 239000004743 Polypropylene Substances 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 239000004698 Polyethylene Substances 0.000 claims description 17
- 239000000853 adhesive Substances 0.000 claims description 17
- 230000001070 adhesive effect Effects 0.000 claims description 17
- 229920000573 polyethylene Polymers 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- 239000007773 negative electrode material Substances 0.000 claims description 15
- 239000007774 positive electrode material Substances 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 14
- 239000011888 foil Substances 0.000 claims description 12
- 229920001155 polypropylene Polymers 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 claims description 7
- 239000011255 nonaqueous electrolyte Substances 0.000 claims description 7
- 239000002985 plastic film Substances 0.000 claims description 7
- 229920006255 plastic film Polymers 0.000 claims description 7
- 229910001593 boehmite Inorganic materials 0.000 claims description 5
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 5
- 239000002041 carbon nanotube Substances 0.000 claims description 5
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 239000003273 ketjen black Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 3
- 239000000347 magnesium hydroxide Substances 0.000 claims description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 2
- 229920001661 Chitosan Polymers 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920002125 Sokalan® Polymers 0.000 claims description 2
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 2
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 claims description 2
- YWJVFBOUPMWANA-UHFFFAOYSA-H [Li+].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O Chemical compound [Li+].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O YWJVFBOUPMWANA-UHFFFAOYSA-H 0.000 claims description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- 239000006230 acetylene black Substances 0.000 claims description 2
- 150000001345 alkine derivatives Chemical class 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 229920001940 conductive polymer Polymers 0.000 claims description 2
- 239000011889 copper foil Substances 0.000 claims description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000011883 electrode binding agent Substances 0.000 claims description 2
- 229910021385 hard carbon Inorganic materials 0.000 claims description 2
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 claims description 2
- 150000003949 imides Chemical class 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 2
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 2
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910021382 natural graphite Inorganic materials 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000004584 polyacrylic acid Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 2
- 239000000661 sodium alginate Substances 0.000 claims description 2
- 235000010413 sodium alginate Nutrition 0.000 claims description 2
- 229940005550 sodium alginate Drugs 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 2
- 229910021384 soft carbon Inorganic materials 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 125000005287 vanadyl group Chemical group 0.000 claims description 2
- 229910000664 lithium aluminum titanium phosphates (LATP) Inorganic materials 0.000 abstract description 72
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 18
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 18
- 239000000919 ceramic Substances 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 239000012528 membrane Substances 0.000 abstract description 6
- 238000004880 explosion Methods 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 17
- 238000006479 redox reaction Methods 0.000 description 9
- 239000011247 coating layer Substances 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 238000007600 charging Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000010416 ion conductor Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000011076 safety test Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a lithium battery diaphragm, a lithium battery and a preparation method. The lithium battery diaphragm is composed of a base film, a ceramic coating and a LATP coating, wherein the ceramic coating and/or the LATP coating are/is arranged on the base film, the ceramic coating is arranged on one side of the base film, which is positioned on the negative electrode of the battery, and the LATP coating is not in direct contact with the negative electrode. The invention also provides a lithium battery, which comprises a positive electrode plate, a negative electrode plate and a lithium battery diaphragm. The invention also provides a preparation method of the lithium battery, which comprises the following steps: and assembling and winding the positive electrode plate, the negative electrode plate and the lithium battery diaphragm, welding, packaging, baking, and injecting electrolyte to obtain the lithium battery. The invention can solve the problem of the existing lithium batteryThe ceramic coated membrane in the cell has poor ionic conductivity and the LATP coated membrane is susceptible to reaction with lithium, resulting in reduced active lithium, reduced battery capacity, and due to Ti during the needling process 4+ And the lithium ion battery reacts with the lithium metal to generate additional heat, so that the separator is invalid, and the short circuit of the positive electrode and the negative electrode is easy to be caused, so that the problem of ignition or explosion of the battery is caused.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery diaphragm, a lithium battery and a preparation method.
Background
The diaphragm is an important component of the lithium ion battery, is a microporous membrane for separating positive and negative electrode pieces, and has the main functions of preventing the contact of the two electrodes from generating short circuit and simultaneously passing electrolyte lithium ions. In the prior art, most commercial lithium ion battery diaphragm products are made of polyolefin materials and polypropylene, and the products comprise a polyethylene PE single-layer film, a polypropylene PP single-layer film and a PP/PE composite PP/PE/PP multi-layer microporous film, however, the safety performance requirements of the lithium ion battery cannot be met due to the characteristics of the materials of the diaphragms. Therefore, in order to meet the safety performance of the lithium ion battery, in the use process, PE or PP/PE/PP is generally taken as a base film, a layer of aluminum oxide or silicon dioxide or magnesium hydroxide or other inorganic ceramic particles with excellent heat resistance is coated on the surface of the base film, and the base film is tightly adhered together after being treated by a special process, so that the flexibility of the combined organic matters and the thermal stability of the inorganic matters are stabilized, the high-temperature resistance, the heat shrinkage resistance and the puncture strength of the diaphragm are improved, and the safety performance of the battery is further improved. Although the inorganic ceramic coating layer greatly improves the safety performance of the battery, it may cause an increase in the internal resistance of the battery and may also reduce the rate performance of the lithium ion battery.
CN 114583397A discloses a functional membrane, its preparation method and application, the functional membrane comprises a base membrane; and a coating layer formed on the surface of the base film, the coating layer including a heat-resistant material, a high molecular polymer, and a solid electrolyte. By providing a coating layer on the surface of the base film, the coating layer and the battery pole piece are arranged betweenThe battery assembled by the functional diaphragm is not easy to deform and has small internal resistance, good multiplying power and power performance, high needling and high-temperature heat box safety performance and good cycle performance. But the functional membrane is found during practical use that Ti in the solid electrolyte in the coating layer 4+ Oxidation-reduction reaction can occur with lithium metal of the negative electrode, so that active lithium is reduced, the battery capacity is reduced, and in a needling experiment, it is also found that chemical reaction heat can be increased in the reaction process of LATP and the active lithium in the negative electrode, so that the separator contracts along the needling Kong Julie, short circuits of the positive electrode and the negative electrode are caused, and the risk of ignition or explosion of the battery exists.
Disclosure of Invention
The invention aims to provide a lithium battery diaphragm, a lithium battery and a preparation method thereof, which are used for solving the problems that the ion conductivity of a ceramic coating diaphragm in the existing lithium battery is poor, a rapid ion conductor LATP diaphragm is easy to generate oxidation-reduction reaction with metal lithium, so that active lithium is reduced, the battery capacity is reduced, and the titanium dioxide (Ti) is used in the needling process 4+ The oxidation-reduction reaction with the metallic lithium of the negative electrode can generate additional heat for chemical reaction to cause the failure of the diaphragm, thereby easily causing the short circuit of the positive electrode and the negative electrode and causing the problem of ignition or explosion of the battery.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a lithium battery diaphragm is composed of a base film, a ceramic coating and a titanium aluminum lithium phosphate (LATP) coating, wherein the ceramic coating and/or the titanium aluminum lithium phosphate (LATP) coating are/is laminated on the base film, the ceramic coating is arranged on one side of the base film, which is positioned on the negative electrode side of a lithium battery, and the titanium aluminum lithium phosphate (LATP) coating is not in direct contact with the negative electrode of the lithium battery.
According to the technical means, the ceramic coating is arranged on one side of the base film, which is positioned on the negative electrode of the lithium battery, and the titanium aluminum lithium phosphate coating is not in direct contact with the negative electrode of the lithium battery, so that Ti in the titanium aluminum lithium phosphate coating is effectively avoided 4+ Redox reaction with metallic lithium of negative electrodeThe problems of reduced active lithium, reduced battery capacity and increased battery internal resistance are caused, and the problems that the chemical reaction heat is increased due to the reaction of LATP and active lithium in the negative electrode in the needling process are effectively avoided, so that the separator contracts along the needling Kong Julie to cause short circuit of the positive electrode and the negative electrode, and the risk of ignition or explosion of the battery is further avoided.
Preferably, the base film is provided with the Lithium Aluminum Titanium Phosphate (LATP) coating on one side of the lithium battery cathode, and the ceramic coating is arranged on the surface of the Lithium Aluminum Titanium Phosphate (LATP) coating.
Preferably, the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating is between 1.5 and 4.5 μm, and the thickness of the ceramic coating is between 0.5 and 1.5 μm.
Preferably, the base film is provided with the Lithium Aluminum Titanium Phosphate (LATP) coating on one side of the positive electrode of the lithium battery, and the ceramic coating on one side of the negative electrode of the lithium battery.
Preferably, the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating is between 1 and 3 mu m, and the thickness of the ceramic coating is between 1 and 3 mu m.
Preferably, the base film is provided with the Lithium Aluminum Titanium Phosphate (LATP) coating on both sides of the positive electrode and the negative electrode of the lithium battery, and the surface of the Lithium Aluminum Titanium Phosphate (LATP) coating on one side of the negative electrode of the lithium battery is provided with the ceramic coating.
Preferably, the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating on the positive electrode side of the lithium battery is between 1.5 and 4.5 mu m, the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating on the negative electrode side of the lithium battery is between 1 and 3 mu m, and the thickness of the ceramic coating is between 0.5 and 1.5 mu m.
Preferably, the base film is made of Polyethylene (PE), polypropylene (PP) or a mixture of polyethylene (PP) and Polypropylene (PE);
the ceramic coating is made of aluminum oxide, boehmite, silicon dioxide, magnesium hydroxide or calcium hydroxide.
The invention also provides a lithium battery, which comprises a positive pole piece, a negative pole piece and the lithium battery diaphragm.
The invention also provides a preparation method of the lithium battery, which comprises the following steps:
1) Uniformly coating the positive electrode slurry on two sides of a base material, and rolling and cutting to obtain a positive electrode plate; the positive electrode slurry comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode adhesive;
2) Uniformly coating the negative electrode slurry on two sides of a base material, and rolling and cutting to obtain a negative electrode plate; the negative electrode slurry comprises a negative electrode active material, a negative electrode conductive agent and a negative electrode adhesive; the base material is aluminum foil or copper foil;
3) And assembling and winding the positive pole piece, the negative pole piece and the lithium battery diaphragm, packaging the welded tabs in an aluminum plastic film, baking at 85 ℃, and then injecting non-aqueous electrolyte, sealing, forming and exhausting to obtain the lithium battery.
Preferably, the positive electrode active material is one or more of lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium-rich manganese-based material, lithium nickel cobalt aluminate and lithium titanate;
the positive electrode conductive agent is one or more of acetylene black, ketjen black, graphene and carbon nanotubes;
the positive electrode adhesive is one or more of polyvinylidene fluoride, polyacrylonitrile, polytetrafluoroethylene, polyvinyl alcohol and polyurethane;
the negative electrode active material is one or more of natural graphite, artificial graphite, soft carbon, hard carbon, silicon oxide, silicon carbon, silicon-based alloy and lithium titanate;
the negative electrode conductive agent is one or more of alkyne black, ketjen black, graphene, carbon nano tubes and conductive carbon black;
the negative electrode binder is one or more of sodium carboxymethyl cellulose, styrene-butadiene rubber, sodium alginate, conductive polymer polyacrylonitrile, hydroxymethyl chitosan, polyacrylic acid and polyvinyl alcohol;
the electrolyte is lithium hexafluorophosphate, lithium tetrafluoroborate or lithium bisfluorosulfonyl imide electrolyte.
Preferably, the positive electrode active material is lithium nickel cobalt manganese oxide (811/622/523, energy density 811 > 622 > 523, but the higher the energy density, the less safe the battery);
the negative electrode active material is graphite;
the positive electrode conductive agent and the negative electrode conductive agent are carbon nanotubes and conductive carbon black;
the positive electrode adhesive is polyvinylidene fluoride;
the electrolyte is lithium hexafluorophosphate electrolyte.
The invention has the beneficial effects that:
according to the lithium battery diaphragm, the ceramic and the LATP are arranged to form the lithium battery diaphragm structure in a lamination mode, wherein the LATP can provide a channel for lithium ions, so that the internal resistance of the battery is reduced, the multiplying power performance of the battery is improved, meanwhile, the composite structure of the ceramic coating and the LATP coating enables the diaphragm structure to have high temperature resistance, heat shrinkage resistance and puncture strength, and the ceramic coating is arranged on one side of the base film, which is positioned on the negative electrode of the lithium battery, and the titanium aluminum lithium phosphate coating is not in direct contact with the negative electrode of the lithium battery, so that Ti in the titanium aluminum lithium phosphate coating is effectively avoided 4+ Oxidation-reduction reaction with metallic lithium of the negative electrode, resulting in problems of reduced active lithium, reduced battery capacity and increased internal resistance of the battery, and Ti in LATP during needling 4+ The lithium ion battery reacts with active lithium in the negative electrode, so that chemical reaction heat is increased, and the diaphragm is contracted along the needling Kong Julie, so that the diaphragm is invalid, and the problems of ignition or explosion of the battery caused by short circuit of the positive electrode and the negative electrode are easily caused; and further, the safety performance of the battery is effectively improved, and the method has popularization and application values in the technical field of lithium ion batteries.
Drawings
Fig. 1 is a schematic structural view of a lithium battery separator in example 1;
fig. 2 is a schematic structural view of a lithium battery separator in example 2;
fig. 3 is a schematic structural view of a lithium battery separator in example 3;
FIG. 4 is an interface diagram of the coating on the negative electrode side of the lithium battery after the lithium battery is fully charged and disassembled in comparative example 3;
FIG. 5 is an interface diagram of the coating on the negative electrode side of the lithium battery after the lithium battery in comparative example 4 is fully charged and disassembled;
FIG. 6 is an interface diagram of the coating on the negative electrode side of the lithium ion battery after the full charge needling of the lithium ion battery in example 4 is disassembled;
FIG. 7 is a schematic diagram of a needling experiment;
wherein, 1-base film; 2-ceramic coating; a lithium titanium aluminum 3-phosphate coating.
Detailed Description
Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present application, however, it will be apparent to one skilled in the art that embodiments of the present application may be practiced without these specific details.
Example 1
As shown in fig. 1, a lithium battery separator is composed of a base film 1, a ceramic coating 2 and a titanium aluminum lithium phosphate (LATP) coating 3, wherein the surface of one side of the base film 1, which is positioned at the negative electrode of a lithium battery, is coated with the titanium aluminum lithium phosphate (LATP) coating 3, and the surface of the titanium aluminum lithium phosphate (LATP) coating 3 is coated with the ceramic coating 2;
the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating 3 is 3 μm, the thickness of the ceramic coating 2 is 1 μm, and the thickness of the base film 1 is 9 μm;
wherein, the base film 1 is made of Polypropylene (PE) material, and the ceramic coating 2 is made of aluminum oxide material.
Example 2
As shown in fig. 2, a lithium battery separator is composed of a base film 1, a ceramic coating 2 and a Lithium Aluminum Titanium Phosphate (LATP) coating 3, wherein the surface of the base film 1 on one side of a positive electrode of a lithium battery is coated with the Lithium Aluminum Titanium Phosphate (LATP) coating 3, and the surface of the base film 1 on one side of a negative electrode of the lithium battery is coated with the ceramic coating 2;
the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating 3 is 2 μm, the thickness of the ceramic coating 2 is 2 μm, and the thickness of the base film 1 is 9 μm;
wherein, the base film 1 is made of Polypropylene (PE) material, and the ceramic coating 2 is made of boehmite material.
Example 3
As shown in fig. 3, a lithium battery separator consists of a base film 1, a ceramic coating 2 and a titanium aluminum lithium phosphate (LATP) coating 3, wherein the surface of the base film 1, which is positioned on the two sides of the positive electrode and the negative electrode of the lithium battery, is coated with the titanium aluminum lithium phosphate (LATP) coating 3, and the surface of the titanium aluminum lithium phosphate (LATP) coating 3, which is positioned on the side of the negative electrode of the lithium battery, is also coated with the ceramic coating 2;
the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating on the positive electrode side of the lithium battery is 2 mu m, the thickness of the Lithium Aluminum Titanium Phosphate (LATP) coating on the negative electrode side of the lithium battery is 1 mu m, the thickness of the ceramic coating is 1 mu m, and the thickness of the base film 1 is 9 mu m;
wherein, the base film 1 is made of polyethylene (PP) material, and the ceramic coating 2 is made of boehmite material.
Comparative example 1
A lithium battery diaphragm is composed of a base film 1 and a ceramic coating 2, wherein the ceramic coating 2 is coated on the surfaces of two sides of a positive electrode and a negative electrode of a lithium battery on the base film 1, the thickness of the base film 1 is 9 mu m, and the thickness of the ceramic coating 2 is 2 mu m;
the base film 1 is made of Polypropylene (PE), and the ceramic coating 2 is made of boehmite.
Comparative example 2
A lithium battery diaphragm is composed of a base film 1 and an LATP coating 3, wherein the base film 1 is coated with a titanium aluminum lithium phosphate (LATP) coating 3 on the surfaces of the two sides of the positive electrode and the negative electrode of the lithium battery, the thickness of the base film 1 is 9 mu m, and the thickness of the titanium aluminum lithium phosphate (LATP) coating 3 is 2 mu m;
the base film 1 is made of Polypropylene (PE).
Example 4
A preparation method of a lithium battery comprises the following steps:
1) Uniformly coating the positive electrode slurry on two sides of an aluminum foil through a coating machine, and rolling and cutting to obtain a positive electrode plate; the positive electrode slurry comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode adhesive, wherein the positive electrode active material is nickel cobalt lithium manganate 811;
2) Uniformly coating the negative electrode slurry on two sides of an aluminum foil, and rolling and cutting to obtain a negative electrode plate; the negative electrode slurry comprises a negative electrode active material, a negative electrode conductive agent and a negative electrode adhesive, wherein the negative electrode active material is graphite;
3) The positive electrode sheet, the negative electrode sheet and the lithium battery diaphragm in the embodiment 1 are assembled and wound (the LATP coating 3 is always wound far away from the negative electrode in winding), the tab is packaged in an aluminum plastic film after being welded, baked at the temperature of 85 ℃, and then injected with a non-aqueous electrolyte, sealed, formed and exhausted to obtain the lithium battery, wherein the electrolyte is commercial 4.35V lithium hexafluorophosphate electrolyte.
Example 5
A preparation method of a lithium battery comprises the following steps:
1) Uniformly coating the positive electrode slurry on two sides of an aluminum foil through a coating machine, and rolling and cutting to obtain a positive electrode plate; the positive electrode slurry comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode adhesive, wherein the positive electrode active material is nickel cobalt lithium manganate 811;
2) Uniformly coating the negative electrode slurry on two sides of an aluminum foil, and rolling and cutting to obtain a negative electrode plate; the negative electrode slurry comprises a negative electrode active material, a negative electrode conductive agent and a negative electrode adhesive, wherein the negative electrode active material is graphite;
3) The positive electrode sheet, the negative electrode sheet and the lithium battery diaphragm in the embodiment 2 are assembled and wound (the LATP coating 3 is always wound far away from the negative electrode in winding), the tab is packaged in an aluminum plastic film after being welded, baked at the temperature of 85 ℃, and then injected with a non-aqueous electrolyte, sealed, formed and exhausted to obtain the lithium battery, wherein the electrolyte is commercial 4.35V lithium hexafluorophosphate electrolyte.
Example 6
A preparation method of a lithium battery comprises the following steps:
1) Uniformly coating the positive electrode slurry on two sides of an aluminum foil through a coating machine, and rolling and cutting to obtain a positive electrode plate; the positive electrode slurry comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode adhesive, wherein the positive electrode active material is nickel cobalt lithium manganate 811;
2) Uniformly coating the negative electrode slurry on two sides of an aluminum foil, and rolling and cutting to obtain a negative electrode plate; the negative electrode slurry comprises a negative electrode active material, a negative electrode conductive agent and a negative electrode adhesive, wherein the negative electrode active material is graphite;
3) The positive electrode sheet, the negative electrode sheet and the lithium battery diaphragm in the embodiment 3 are assembled and wound (the LATP coating 3 is always wound far away from the negative electrode in winding), the tab is packaged in an aluminum plastic film after being welded, baked at the temperature of 85 ℃, and then injected with a non-aqueous electrolyte, sealed, formed and exhausted to obtain the lithium battery, wherein the electrolyte is commercial 4.35V lithium hexafluorophosphate electrolyte.
Comparative example 3
A preparation method of a lithium battery comprises the following steps:
1) Uniformly coating the positive electrode slurry on two sides of an aluminum foil through a coating machine, and rolling and cutting to obtain a positive electrode plate; the positive electrode slurry comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode adhesive, wherein the positive electrode active material is nickel cobalt lithium manganate 811;
2) Uniformly coating the negative electrode slurry on two sides of an aluminum foil, and rolling and cutting to obtain a negative electrode plate; the negative electrode slurry comprises a negative electrode active material, a negative electrode conductive agent and a negative electrode adhesive, wherein the negative electrode active material is graphite;
3) The positive electrode sheet, the negative electrode sheet and the lithium battery diaphragm in comparative example 1 were assembled and wound (the LATP coating 3 was always wound away from the negative electrode during winding), and after tab welding, the lithium battery diaphragm was packaged in an aluminum plastic film, baked at 85 ℃, and then injected with a nonaqueous electrolyte, sealed, formed and exhausted to obtain a lithium battery, wherein the electrolyte was a commercial 4.35V lithium hexafluorophosphate electrolyte.
Comparative example 4
A preparation method of a lithium battery comprises the following steps:
1) Uniformly coating the positive electrode slurry on two sides of an aluminum foil through a coating machine, and rolling and cutting to obtain a positive electrode plate; the positive electrode slurry comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode adhesive, wherein the positive electrode active material is nickel cobalt lithium manganate 811;
2) Uniformly coating the negative electrode slurry on two sides of an aluminum foil, and rolling and cutting to obtain a negative electrode plate; the negative electrode slurry comprises a negative electrode active material, a negative electrode conductive agent and a negative electrode adhesive, wherein the negative electrode active material is graphite;
3) The positive electrode sheet, the negative electrode sheet and the lithium battery diaphragm in comparative example 2 were assembled and wound (the LATP coating 3 was always wound away from the negative electrode during winding), and after tab welding, the lithium battery diaphragm was packaged in an aluminum plastic film, baked at 85 ℃, and then injected with a nonaqueous electrolyte, sealed, formed and exhausted to obtain a lithium battery, wherein the electrolyte was a commercial 4.35V lithium hexafluorophosphate electrolyte.
Detection analysis
Electrochemical and safety performance tests were performed on the lithium batteries prepared in examples 4 to 6, and comparative examples 3 and 4, and specifically included:
1) And (3) testing the internal resistance of the battery: a battery internal resistance tester with the frequency of 1KHZ;
2) Multiplying power charging: step1: charging at 0.33C constant current and constant voltage to 4.35V at 25+ -2 deg.C, stopping at 0.05C, standing for 1h, discharging at 0.33C to 2.8V, and standing for 1h; recording a constant current charging capacity C1 of 0.33C;
step2: 3C constant current and constant voltage charge to 4.35V at 25+ -2 deg.C, stop current at 0.05C, hold for 1h,0.33C discharge to 2.8V, hold for 1h; recording 3C and filling constant current capacity C2;
the calculation formula is as follows: constant current charge ratio = C2/C1 x 100
3) Needling: step1: (25+/-2) DEG C, discharging the 1C constant current to 2.8V, and standing for 60min;
step2: charging at 25+ -2deg.C under constant current and constant voltage of 1C to 4.35V, and standing for 60min with cut-off current of 0.05C;
step3: a 5mm high temperature resistant steel needle (the conical angle of the needle point is 45-60 degrees, the surface of the needle is smooth and clean, no rust, no oxide layer and no greasy dirt) penetrates from the direction perpendicular to the polar plate of the storage battery at the speed of 25+/-2 mm/s, the penetrating position is close to the geometric center of the penetrated surface, and the steel needle stays in the storage battery;
step4: after the above steps are completed, observing for 60min at the test environment temperature;
and collecting the temperature and voltage of the test battery cell in the test process. Determination criteria: does not fire or explode.
Among them, the common safety test of the power battery mainly includes overcharge, overdischarge, extrusion, needling, and the like, and needling is also called as the harshest safety test. Purpose of needling test: simulating the safety of the lithium ion battery under the condition of internal short circuit, wherein the occurrence of the internal short circuit comprises metal foreign matters, pole piece burrs, lithium dendrites generated by low-temperature charging, copper dendrites generated by overdischarge and the like in the production process;
as shown in fig. 7, the principle of the needling experiment: by piercing the diaphragm, the positive and negative poles are caused to short, and a short-circuit point is artificially manufactured in the battery, so that the short-circuit phenomenon caused by conductive redundant substances in the battery is simulated.
The results of the measurements are shown in Table 1, FIG. 4 and FIG. 5.
Table 1 lithium battery performance test results
| Examples | Internal resistance of battery (mΩ) | Multiplying power charging/3C | Needling process |
| Example 4 | 12.58 | 67.38％ | 10/10 |
| Example 5 | 15.82 | 63.39％ | 10/10 |
| Example 6 | 14 | 63.96％ | 10/10 |
| Comparative example 3 | 18.12 | 60.32％ | 10/10 |
| Comparative example 4 | 13.02 | 66.69％ | 2/10 |
Note that: in Table 1, a 2/10 definition is to test 10 cells needled through 2.
As can be seen from the combination of table 1 and fig. 6: 1) Comparing comparative example 3, comparative example 4 and examples 4 to 6, comparative example 3 has a large internal resistance of the separator due to the arrangement of the ceramic coating; in the comparative example 4, since LATP is a lithium ion conductor, compared with ceramics, the LATP can reduce the ion transmission impedance of a diaphragm and improve the rate capability, but is easy to react with a lithium-rich cathode, so that the risk of needling failure is greatly improved; in the embodiment 4 to the embodiment 6, through innovatively and reasonably laminating the LATP and the ceramic, the problem of larger internal resistance of the diaphragm is effectively solved, the LATP and the lithium-rich negative electrode are effectively prevented from undergoing chemical reaction, and meanwhile, the advantages of reducing the internal resistance of the battery, reducing the ion transmission impedance of the diaphragm, improving the multiplying power performance and reducing the needling failure risk are achieved, so that the electrochemical performance and the safety performance of the battery are effectively ensured; 2) Compared with examples 4 to 6, the lithium battery with the double-sided coating in example 6 is slightly increased in internal resistance compared with the single-sided coating in example 5 under the influence of the interface between the coating and the diaphragm, and the rate performance is slightly reduced, but the needling is completely passed; 3) The difference in LATP thickness between examples 5 and 6 increases the thickness of the LATP layer, decreases the internal resistance, increases the rate performance, and allows the entire needle to pass through.
As is apparent from fig. 4, the LATP coating provided on the negative electrode side of the lithium battery undergoes an oxidation-reduction reaction with active lithium of the negative electrode, thereby causing reversible lithium loss of the battery, capacity degradation of the battery, and the product generated by side reaction causes SEI film failure, resulting in an increase in internal resistance of the battery. And the battery needling experiment shows that the battery safety failure is accelerated, so that the battery safety risk is caused. As can be seen from fig. 5, the ceramic coating provided on the negative electrode side of the lithium battery did not undergo oxidation-reduction reaction with lithium ions of the negative electrode.
From experimental comparative analysis, the results of the analyses of the merits and demerits of the separator according to the present invention (including, but not limited to, any one of examples 1 to 3), the separator according to comparative example 1 and the separator according to comparative example 2 are shown in table 2.
TABLE 2 comparison of diaphragm Performance advantages and disadvantages
In summary, experiments show that the lithium battery separator of the invention has the same thickness as compared with the separator coated with pure ceramic (berbambusae or aluminum oxide)The internal resistance of the battery of the diaphragm is small, and the LATP has good lithium ion conductivity, so that the multiplying power performance of the battery is better than that of the battery coated with the diaphragm made of pure ceramics, and meanwhile, the battery has the advantages of high temperature resistance, heat shrinkage resistance and puncture strength performance due to the ceramic coating. The lithium battery separator of the invention does not react (Ti +4 Oxidation-reduction reaction with lithium to form Li x TiO 2 ) Meanwhile, the high temperature resistance, the heat shrinkage resistance and the puncture strength of the ceramic are maintained. Wherein, the coating of the mixture of ceramic and LATP still contacts the negative electrode of the lithium battery, so that the oxidation-reduction reaction of LATP and metallic lithium is still avoided. Compared with the existing battery directly coated with ceramic or directly coated with LATP (contact surface with a negative electrode) or coated with ceramic and LATP mixture, the lithium battery diaphragm provided by the invention has good lithium ion conductivity, keeps ceramic high temperature resistance, heat shrinkage resistance and puncture strength, has better safety characteristic than pure LATP (a coating ceramic is not contacted with the negative electrode), keeps good lithium ion conductivity of LATP, and simultaneously has high temperature resistance, heat shrinkage resistance and puncture strength, and has popularization and application value in the technical field of lithium batteries.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present application. It is therefore contemplated that the appended claims will cover all such equivalent modifications and changes as fall within the true spirit and scope of the disclosure.
Claims (11)
1. The lithium battery diaphragm is characterized by comprising a base film, a ceramic coating and a titanium aluminum lithium phosphate coating, wherein the ceramic coating and/or the titanium aluminum lithium phosphate coating are/is laminated on the base film, the ceramic coating is arranged on one side of the base film, which is positioned on the negative electrode of a lithium battery, and the titanium aluminum lithium phosphate coating is not in direct contact with the negative electrode of the lithium battery.
2. The lithium battery separator according to claim 1, wherein the titanium aluminum lithium phosphate coating is arranged on one side of the base film, which is positioned on the negative electrode of the lithium battery, and the ceramic coating is arranged on the surface of the titanium aluminum lithium phosphate coating.
3. The lithium battery separator according to claim 2, wherein the thickness of the titanium aluminum lithium phosphate coating is between 1.5 and 4.5 μm, and the thickness of the ceramic coating is between 0.5 and 1.5 μm.
4. The lithium battery separator according to claim 1, wherein the base film is provided with the titanium aluminum lithium phosphate coating on a side located at a positive electrode of the lithium battery and the ceramic coating on a side located at a negative electrode of the lithium battery.
5. The lithium battery separator according to claim 4, wherein the thickness of the titanium aluminum lithium phosphate coating is between 1 and 3 μm, and the thickness of the ceramic coating is between 1 and 3 μm.
6. The lithium battery diaphragm according to claim 1, wherein the titanium aluminum lithium phosphate coating is provided on both sides of the positive electrode and the negative electrode of the lithium battery on the base film, and the ceramic coating is provided on the surface of the titanium aluminum lithium phosphate coating on the negative electrode side of the lithium battery.
7. The lithium battery separator according to claim 6, wherein the thickness of the titanium aluminum lithium phosphate coating on the positive electrode side of the lithium battery is 1.5-4.5 μm, the thickness of the titanium aluminum lithium phosphate coating on the negative electrode side of the lithium battery is 1-3 μm, and the thickness of the ceramic coating is 0.5-1.5 μm.
8. The lithium battery separator according to claim 1, wherein the base film is made of polyethylene, polypropylene or a mixture of polyethylene and polypropylene;
the ceramic coating is made of aluminum oxide, boehmite, silicon dioxide, magnesium hydroxide or calcium hydroxide.
9. A lithium battery comprising a positive electrode sheet, a negative electrode sheet and a lithium battery separator according to any one of claims 1 to 8.
10. A method of preparing a lithium battery as claimed in claim 9, comprising the steps of:
1) Uniformly coating the positive electrode slurry on two sides of a base material, and rolling and cutting to obtain a positive electrode plate; the positive electrode slurry comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode adhesive;
2) Uniformly coating the negative electrode slurry on two sides of a base material, and rolling and cutting to obtain a negative electrode plate; the negative electrode slurry comprises a negative electrode active material, a negative electrode conductive agent and a negative electrode adhesive; the base material is aluminum foil or copper foil;
3) And assembling and winding the positive pole piece, the negative pole piece and the lithium battery diaphragm, packaging the welded tabs in an aluminum plastic film, baking at 85 ℃, and then injecting non-aqueous electrolyte, sealing, forming and exhausting to obtain the lithium battery.
11. The method for producing a lithium battery according to claim 10, wherein the positive electrode active material is one or more of lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium iron phosphate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium-rich manganese-based material, lithium nickel cobalt aluminate and lithium titanate;
the positive electrode conductive agent is one or more of acetylene black, ketjen black, graphene and carbon nanotubes;
the positive electrode adhesive is one or more of polyvinylidene fluoride, polyacrylonitrile, polytetrafluoroethylene, polyvinyl alcohol and polyurethane;
the negative electrode active material is one or more of natural graphite, artificial graphite, soft carbon, hard carbon, silicon oxide, silicon carbon, silicon-based alloy and lithium titanate;
the negative electrode conductive agent is one or more of alkyne black, ketjen black, graphene, carbon nano tubes and conductive carbon black;
the negative electrode binder is one or more of sodium carboxymethyl cellulose, styrene-butadiene rubber, sodium alginate, conductive polymer polyacrylonitrile, hydroxymethyl chitosan, polyacrylic acid and polyvinyl alcohol;
the electrolyte is lithium hexafluorophosphate, lithium tetrafluoroborate or lithium bisfluorosulfonyl imide electrolyte.
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