CN102088086A - High-voltage lithium ion battery anode, lithium ion battery using same and preparation method of high-voltage lithium ion battery anode - Google Patents
High-voltage lithium ion battery anode, lithium ion battery using same and preparation method of high-voltage lithium ion battery anode Download PDFInfo
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- CN102088086A CN102088086A CN2010106136115A CN201010613611A CN102088086A CN 102088086 A CN102088086 A CN 102088086A CN 2010106136115 A CN2010106136115 A CN 2010106136115A CN 201010613611 A CN201010613611 A CN 201010613611A CN 102088086 A CN102088086 A CN 102088086A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 67
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 41
- 239000006258 conductive agent Substances 0.000 claims description 39
- 239000007774 positive electrode material Substances 0.000 claims description 30
- 239000002904 solvent Substances 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- -1 polytetrafluoroethylene Polymers 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 18
- 229910002804 graphite Inorganic materials 0.000 claims description 16
- 239000010439 graphite Substances 0.000 claims description 16
- 239000005030 aluminium foil Substances 0.000 claims description 15
- 239000003792 electrolyte Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 230000004888 barrier function Effects 0.000 claims description 12
- 239000007773 negative electrode material Substances 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 9
- 239000011218 binary composite Substances 0.000 claims description 8
- 229910012409 LiNi0.4Mn1.6O4 Inorganic materials 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 239000012298 atmosphere Substances 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 239000011889 copper foil Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 238000012958 reprocessing Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 229910000676 Si alloy Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 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 3
- 239000006230 acetylene black Substances 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910021385 hard carbon Inorganic materials 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000002153 silicon-carbon composite material Substances 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 4
- 239000013543 active substance Substances 0.000 abstract 2
- 238000004513 sizing Methods 0.000 abstract 2
- 229910013716 LiNi Inorganic materials 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 229910002099 LiNi0.5Mn1.5O4 Inorganic materials 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 5
- 150000001721 carbon Chemical class 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229910004493 Li(Ni1/3Co1/3Mn1/3)O2 Inorganic materials 0.000 description 1
- 229910013075 LiBF Inorganic materials 0.000 description 1
- 229910013188 LiBOB Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- SIXOAUAWLZKQKX-UHFFFAOYSA-N carbonic acid;prop-1-ene Chemical compound CC=C.OC(O)=O SIXOAUAWLZKQKX-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 150000004862 dioxolanes Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
Images
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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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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a high-voltage lithium ion battery anode, a lithium ion battery using the same and a preparation method of the high-voltage lithium ion battery anode. The high-voltage lithium ion battery anode comprises a current collector, an anode active substance material, a conduction agent and a binder, wherein 85-95wt% of anode active substance material, 2.5-7.5wt% of conduction agent and 2.5-7.5wt% of binder are prepared into a sizing agent; and the sizing agent is coated on the current collector. The lithium ion battery anode in the invention and the lithium ion battery using the anode have the advantages of high discharging voltage platform, high specific energy and low cost and are easy for large-scale industrial production.
Description
Technical field
The present invention relates to the lithium-ion battery energy technical field, it is anodal and use the lithium ion battery and the preparation method of this positive pole particularly to relate to a kind of high-voltage lithium ion batteries.
Background technology
Lithium ion battery with regard to being subjected to liking of users owing to its high voltage and high-energy-density, also has been subjected to numerous researchers' attention since coming out.Particularly enter 21st century, the fast development and the extensive use of various portable electric appts, radio mobile communication equipment, motor vehicle, for height ratio capacity more, recycle the life-span long, the demand of lithium ion battery seems more urgent cheaply.
The key that improves lithium ion battery high-energy-density index is the exploitation of high-energy-density positive electrode and the design of anode electrode, and most researchers has been put into the exploitation of the positive electrode of high-energy-density to main energy, and has ignored the design of anode electrode.
At present, dropped into the lithium ion battery of commercialization large-scale application, its anodal active material that adopts is LiCoO mostly
2, LiMn
2O
4, LiFePO
4, Li (Ni
1/3Co
1/3Mn
1/3) O
2, Li (Ni
1/3Co
1/3Al
1/3) O
2The actual specific capacity of these positive electrodes can reach 120-150mAh/g, and to carbon class negative discharge voltage platform mostly in 3.6V-3.8V (except that the discharge voltage plateau of LiFePO4 is the 3.2V), the lithium ion battery of forming with the silicon-based anode alloy collocation of the carbon class negative pole of height ratio capacity and superelevation specific capacity, the raising of its specific energy is still limited, has therefore limited the further raising of the specific energy of lithium ion battery to a great extent.
Summary of the invention
In order to solve the low and low problem of discharge voltage plateau of existing lithium ion battery and anodal specific energy thereof, the lithium ion battery that the object of the invention is to provide a kind of high-voltage lithium ion batteries positive pole and uses this positive pole.
Adopt 5V high voltage binary material LiNi by positive active material
xMn
2-xO
4Carry out composite modifiedly with carbon class material,, produce the high-voltage lithium ion batteries positive pole with advanced person's technical recipe, the electrode design and the manufacture craft thereof of optimization.Adopt this positive pole, the negative pole of arranging in pairs or groups again, barrier film, electrolyte and battery case produce the lithium ion battery of high voltage high-energy-density.
Concrete technical scheme is as follows:
A kind of high-voltage lithium ion batteries positive pole, comprise collector, the positive electrode active material material, conductive agent and binding agent, described positive electrode active material material, conductive agent and binding agent are according to the positive active material of weight proportion 85%-95%, and the conductive agent of 2.5%-7.5% and the binding agent of 2.5%-7.5% constitute slurry, and described slurry is coated on the described collector.
Further, the positive electrode active material material is 5V high voltage binary composite L iNi
xMn
2-xO
4/ C, wherein, 0＜x≤0.5.
Further, the positive electrode active material material is 5V high voltage binary composite L iNi
0.5Mn
1.5O
4/ C or LiNi
0.4Mn
1.6O
4/ C.
Further, described collector is an aluminium foil, thickness 15 μ m-40 μ m, and the coated side density of described positive pole is 26mg/cm
2-35mg/cm
2
Further, described binding agent is one or both the mixture in Kynoar, the polytetrafluoroethylene, described conductive agent is the hybrid conductive agent, form by super conductive black and super electrically conductive graphite, proportioning is 1: 1 (w: w), wherein, the weight proportion of conductive agent and binding agent use amount is (1.0-1.25): 1.
Use the lithium ion battery of above-mentioned high-voltage lithium ion batteries positive pole, comprise each described high-voltage lithium ion batteries positive pole among the claim 1-5, negative pole is inserted in the barrier film between positive pole and the negative pole, electrolyte and battery case.
Further, described barrier film is polyethylene, polypropylene or polyethylene and polypropylene composite film, and described negative pole comprises negative electrode active material, conductive agent, binding agent and collector.
Further, this negative electrode active material is one or more in native graphite, Delanium, carbonaceous mesophase spherules, hard carbon, ashbury metal, silicon alloy, Si-C composite material, 3 SiC 2/graphite composite material and the lithium titanate material, this binding agent is one or both the mixture among Kynoar PVDF, polytetrafluoroethylene PTFE, styrene butadiene rubber sbr, the sodium carboxymethylcellulose CMC, this conductive agent is one or more the mixture in acetylene black, super conductive black, super electrically conductive graphite, the conductive carbon nanotube, and this collector is Copper Foil or aluminium foil.
The preparation method of above-mentioned high-voltage lithium ion batteries positive pole, further, adopt following steps:
(1) binding agent is dispersed in the middle of the solvent;
(2), add in the container that feeds nitrogen or argon gas inert atmosphere with positive electrode active material material and conductive agent composition mixture;
(3) to the mixture ball milling, fully to be ground and evenly mix after join in the middle of the solvent, mix and obtain slurry;
(4) slurry is coated in above the collector aluminium foil, drying rolls, and cuts, and can obtain above-mentioned positive pole.
The preparation method of above-mentioned lithium ion battery, further, adopt following steps:
(1) binding agent is dispersed in the middle of the solvent;
(2) join in the middle of the solvent after negative electrode active material material and conductive agent are evenly mixed, mix, be coated in above the collector;
(3) drying rolls, and cuts, and obtains negative pole;
(4) positive pole, negative pole, the barrier film that is inserted between positive pole and the negative pole are assembled;
(5) by the body that confluxes lug and terminal are linked together, in the battery case of packing into;
(6) inject electrolyte, sealing changes into reprocessing.
Compare with present prior art, the lithium ion cell positive that the present invention prepares and use the lithium ion battery of this positive pole to have the discharge voltage plateau height, the specific energy height, cost is low, is easy to large-scale industrial production.
Description of drawings
Fig. 1: be the charging and discharging curve figure of the invention process example 4 monomer lithium ion battery batteries.
Fig. 2: be the cyclic curve figure of the invention process example 4 monomer lithium ion battery batteries.
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in the numerous embodiments of the present invention.
High voltage 5V LiNi
0.5Mn
1.5O
4And LiNi
0.4Mn
1.6O
4Material all has lithium discharge platform voltage height (about 4.7V), actual specific capacity can reach 120-140mAh/g and cycle performance is good.LiNi wherein
0.4Mn
1.6O
4Material has two discharge voltage plateaus, is respectively 4.7V and 4.0V, and 5V LiNi
0.5Mn
1.5O
4The material discharging voltage platform mainly concentrates on the 4.7V district, with LiNi
0.4Mn
1.6O
4Compare, have the 4.7V discharge platform and increase, and reversible capacity is bigger, the better characteristics of cyclical stability.If this type of material through composite modified, is used for lithium ion cell positive with advanced person's technical recipe and electrode design, will improves the voltage and the specific energy of the lithium ion battery that adopts this positive pole greatly.Therefore, adopt LiNi
0.5Mn
1.5O
4Composite modification material is as the positive electrode active material material, technical recipe and electrode design by the advanced person, it is about 30% that the lithium ion battery specific energy that itself and carbon class negative pole are formed can improve, and has favorable charge-discharge performance and cycle performance simultaneously, is easy to large-scale industrial production.
Present embodiment provides a kind of high-voltage lithium ion batteries positive pole, and this positive pole comprises collector, is coated in positive electrode active material material, conductive agent, binding agent on this collector,
Wherein the positive electrode active material material is 5V high voltage binary composite L iNi
xMn
2-xO
4(0＜x≤0.5, the typical case represents chemical formula LiNi to/C
0.5Mn
1.5O
4/ C and LiNi
0.4Mn
1.6O
4/ C),
Preferentially select LiNi for use
0.5Mn
1.5O
4/ C;
Anode formula is:
The positive active material of 85%-95% weight, the conductive agent of 2.5%-7.5% and the binding agent of 2.5%-7.5%,
Wherein the proportioning of conductive agent and binding agent use amount is (1.0-1.25): 1,
Anodal coated side density is 26mg/cm
2-35mg/cm
2
Present embodiment also provides a kind of lithium ion battery, this battery comprises positive pole, negative pole, is inserted in barrier film, electrolyte, battery case between positive pole and the negative pole, wherein said positive pole comprises collector, is coated in positive electrode active material material, binding agent, conductive agent on this collector, and wherein the positive electrode active material material is 5V high voltage binary composite L iNi
xMn
2-xO
4(0＜x≤0.5, the typical case represents chemical formula LiNi to/C
0.5Mn
1.5O
4/ C and LiNi
0.4Mn
1.6O
4/ C), preferentially select LiNi for use
0.5Mn
1.5O
4/ C; Anode formula is: the positive active material of 85%-95% weight, and the conductive agent of 2.5%-7.5% and the binding agent of 2.5%-7.5%, wherein the proportioning of conductive agent and binding agent use amount is (1.0-1.25): 1, anodal coated side density is 26mg/cm
2-35mg/cm
2
Present embodiment has the following advantages:
The lithium ion battery that present embodiment provides is compared with similar lithium ion battery product, has open circuit voltage height, discharge voltage plateau height, specific energy height, charge-discharge performance and good cycle; Anodal simultaneously high voltage binary composite positive pole and the advanced technical recipe of adopting through the optimal design of electrode, can increase substantially lithium ion battery specific energy and volumetric specific energy, saves volumetric spaces and weight.
This preferred embodiment provides a kind of high-voltage lithium ion batteries positive pole, and this positive pole comprises collector, is coated in positive electrode active material material, binding agent, conductive agent on this collector, and wherein the positive electrode active material material is 5V high voltage binary composite L iNi
xMn
2-xO
4(0＜x≤0.5, the typical case represents chemical formula LiNi to/C
0.5Mn
1.5O
4/ C and LiNi
0.4Mn
1.6O
4/ C), preferentially select LiNi for use
0.5Mn
1.5O
4/ C.Anode formula is: the positive active material of 85%-95% weight, and the conductive agent of 2.5%-7.5% and the binding agent of 2.5%-7.5%, wherein the proportioning of conductive agent and binding agent use amount is (1.0-1.25): 1, anodal coated side density is 26mg/cm
2-35mg/cm
2
Described collector is an aluminium foil, thickness 15 μ m-40 μ m.
Described binding agent is one or both the mixture in Kynoar, the polytetrafluoroethylene.
Described conductive agent is the hybrid conductive agent, is made up of super conductive black and super electrically conductive graphite, and proportioning is 1: 1 (w: w).
The preparation method of described positive pole is
Earlier binding agent is dispersed in the middle of the solvent,
Again with positive electrode active material material and conductive agent composition mixture, add in the container that feeds nitrogen or argon gas inert atmosphere, ball milling, fully to be ground and evenly mix after join in the middle of the solvent, mix and obtain slurry, prepared slurry is coated in above the collector aluminium foil, dry, roll, cut, can obtain above-mentioned positive pole.
Described solvent is the N-methyl pyrrolidone.
The lithium ion battery that present embodiment provides, this battery comprise positive pole, negative pole, are inserted in barrier film, electrolyte, battery case between positive pole and the negative pole.Described barrier film is polyethylene, polypropylene or polyethylene and polypropylene composite film, is inserted in the middle of anodal and the negative pole.
Described negative pole can adopt the preparation method of lithium ion battery negative known in the art to make, and in general described negative pole comprises negative electrode active material, conductive agent, binding agent and collector.
Described negative electrode active material is one or more in native graphite, Delanium, carbonaceous mesophase spherules, hard carbon, ashbury metal, silicon alloy, Si-C composite material, 3 SiC 2/graphite composite material and the lithium titanate material, preferentially selects Delanium for use.Described binding agent is one or both the mixture in Kynoar (PVDF), polytetrafluoroethylene (PTFE), butadiene-styrene rubber (SBR), the sodium carboxymethylcellulose (CMC).Described conductive agent is one or more the mixture in acetylene black, super conductive black, super electrically conductive graphite, the conductive carbon nanotube.Described collector is Copper Foil or aluminium foil.
The preparation method of described negative pole is for earlier being dispersed in binding agent in the middle of the solvent, joins in the middle of the solvent after negative electrode active material material and conductive agent evenly being mixed again, and mixes, be coated in above the collector, drying rolls, cut, can obtain above-mentioned negative pole.Described solvent is deionized water or N-methyl pyrrolidone.
Described electrolyte is organic liquid electrolyte, and wherein the electrolyte lithium salt of electrolyte is LiPF
6, LiClO
4, LiBOB, LiBF
6, LiAsPF
6, LiCF
3SO
3, LiN (CF
3SO
2)
2, Li (C
2F
5)
3PF
3, Li (C
3F
7)
3PF
3A kind of mixture of or at least 2 kinds of salt; The solvent of electrolyte is the mixed system of a kind of or at least 2 kinds of solvents in ethylene carbonate, propene carbonate, dimethyl carbonate, carbonic acid diethyl ester, methyl ethyl carbonate, oxolane, the dioxolanes.
Described battery case is plastic casing, plastics and metallic composite shell, metal shell or metallic alloy shell.
Above-mentioned positive pole, negative pole, the barrier film that is inserted between positive pole and the negative pole are assembled, by the body that confluxes lug and terminal are linked together, in the battery case of packing into, and then injection electrolyte, sealing changes into, reprocessing can obtain the lithium ion battery of present embodiment.
Anodal and use the lithium ion battery of this positive pole to be elaborated below by instantiation to a kind of high-voltage lithium ion batteries of present embodiment.
Preferred embodiment example 1
This embodiment is used to prepare the high-voltage lithium ion batteries positive pole of present embodiment
By mass percentage, with 91% positive electrode active material material LiNi
0.5Mn
1.5O
4/ C, 2.5% the super carbon black of leading, 2.5% super electrically conductive graphite, 4% binding agent Kynoar as solvent, is dispersed in binding agent in the middle of the solvent with the N-methyl pyrrolidone earlier; Again conductive agent and positive active material material mixing are stirred, be scattered in again in the middle of the solvent, stir, make its even mixing, make slurry., as collector slurry evenly is coated on the aluminium foil with the thick aluminium foil of 19 μ m, the control temperature is 125 ℃ of dry 8h, and anodal coated side density is 31mg/cm
2
With pole piece roll, 115 ℃ of dry 12h under the inert argon atmosphere again, cut then, make positive pole.
Preferred embodiment example 2
This embodiment is used to prepare the high-voltage lithium ion batteries positive pole of present embodiment
By mass percentage, with 86% positive active material LiNi
0.5Mn
1.5O
4/ C material, 3.75% superconduction carbon black, 3.75% electrically conductive graphite, 6.5% binding agent Kynoar as solvent, is dispersed in binding agent in the middle of the solvent with the N-methyl pyrrolidone earlier; Again conductive agent and positive active material material mixing are stirred, be scattered in again in the middle of the solvent, stir, make its even mixing, make slurry., as collector slurry is coated on the aluminium foil with the thick aluminium foil of 25 μ m, the control temperature is 125 ℃ of dry 8h.The coated side density of positive electrode is 26mg/cm
2
With pole piece roll, 110 ℃ of dry 12h under the inert atmosphere of nitrogen environment again, cut then, make positive pole.
Preferred embodiment example 3
This embodiment is used to prepare the high-voltage lithium ion batteries positive pole of present embodiment
By mass percentage, with 94% positive active material LiNi
0.5Mn
1.5O
4/ C material, 1.5% superconduction carbon black, 1.5% electrically conductive graphite, 3% binding agent Kynoar as solvent, is dispersed in binding agent in the middle of the solvent with the N-methyl pyrrolidone earlier; Again conductive agent and positive active material material mixing are stirred, be scattered in again in the middle of the solvent, stir, make its even mixing, make slurry., as collector slurry is coated on the aluminium foil with the thick aluminium foil of 21 μ m, the control temperature is 125 ℃ of dry 8h.The coated side density of positive electrode is 35mg/cm
2
With pole piece roll, 110 ℃ of dry 12h under the inert atmosphere of nitrogen environment again, cut then, make positive pole.
Preferred embodiment example 4
This embodiment is used to prepare lithium ion battery, and this lithium ion battery adopts the positive pole of the made present embodiment of embodiment 3.
By mass percentage, the negative electrode active material Delanium material with 88%, 4.0% superconduction carbon black, 4.0% electrically conductive graphite, 4% SBR and CMC hybrid adhesive are solvent with the deionized water, binding agent are dispersed in the middle of the solvent earlier; Again conductive agent and negative electrode active material material mixing are stirred, be scattered in again in the middle of the solvent, stir, make its even mixing, make slurry., as collector slurry is coated on the Copper Foil with the thick Copper Foil of 10 μ m, the control temperature is 110 ℃ of dry 8h.The coated side density of negative electrode is 14mg/cm
2
With pole piece roll, 105 ℃ of dry 12h under the inert atmosphere of nitrogen environment again, cut then, make negative pole.
Positive pole, negative pole, barrier film are assembled again, by the body that confluxes lug and terminal are linked together, in the battery case of packing into, and then inject electrolyte, sealing changes into, and reprocessing makes lithium ion battery.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. high-voltage lithium ion batteries positive pole, it is characterized in that, comprise collector, the positive electrode active material material, conductive agent and binding agent, described positive electrode active material material, conductive agent and binding agent are according to the positive active material of weight proportion 85%-95%, the conductive agent of 2.5%-7.5% and the binding agent of 2.5%-7.5% constitute slurry, and described slurry is coated on the described collector.
2. high-voltage lithium ion batteries positive pole as claimed in claim 1 is characterized in that, the positive electrode active material material is 5V high voltage binary composite L iNi
xMn
2-xO
4/ C, wherein, 0＜x≤0.5.
3. high-voltage lithium ion batteries positive pole as claimed in claim 2 is characterized in that, the positive electrode active material material is 5V high voltage binary composite L iNi
0.5Mn
1.5O
4/ C or LiNi
0.4Mn
1.6O
4/ C.
4. as each described high-voltage lithium ion batteries positive pole among the claim 1-3, it is characterized in that described collector is an aluminium foil, thickness 15 μ m-40 μ m, the coated side density of described positive pole is 26mg/cm
2-35mg/cm
2
5. as each described high-voltage lithium ion batteries positive pole among the claim 1-4, it is characterized in that, described binding agent is one or both the mixture in Kynoar, the polytetrafluoroethylene, described conductive agent is the hybrid conductive agent, form by super conductive black and super electrically conductive graphite, proportioning is that (w: w), wherein, the weight proportion of conductive agent and binding agent use amount was (1.0-1.25): 1 in 1: 1.
6. use the lithium ion battery of the described high-voltage lithium ion batteries positive pole of claim 1-5, it is characterized in that, comprise each described high-voltage lithium ion batteries positive pole among the claim 1-5, negative pole, be inserted in the barrier film between positive pole and the negative pole, electrolyte and battery case.
7. use the described lithium ion battery of claim 6, it is characterized in that described barrier film is polyethylene, polypropylene or polyethylene and polypropylene composite film, described negative pole comprises negative electrode active material, conductive agent, binding agent and collector.
8. use the described lithium ion battery of claim 7, it is characterized in that, this negative electrode active material is a native graphite, Delanium, carbonaceous mesophase spherules, hard carbon, ashbury metal, silicon alloy, Si-C composite material, in 3 SiC 2/graphite composite material and the lithium titanate material one or more, this binding agent is Kynoar PVDF, polytetrafluoroethylene PTFE; styrene butadiene rubber sbr; the mixture of one or both among the sodium carboxymethylcellulose CMC; this conductive agent is an acetylene black; super conductive black; super electrically conductive graphite; the mixture of one or more in the conductive carbon nanotube, this collector is Copper Foil or aluminium foil.
9. the preparation method of the described high-voltage lithium ion batteries positive pole of claim 1-5 is characterized in that, adopts following steps:
(1) binding agent is dispersed in the middle of the solvent;
(2), add in the container that feeds nitrogen or argon gas inert atmosphere with positive electrode active material material and conductive agent composition mixture;
(3) to the mixture ball milling, fully to be ground and evenly mix after join in the middle of the solvent, mix and obtain slurry;
(4) slurry is coated in above the collector aluminium foil, drying rolls, and cuts, and can obtain above-mentioned positive pole.
10. claim 7, the preparation method of 8 described lithium ion batteries is characterized in that, adopts following steps:
(1) binding agent is dispersed in the middle of the solvent;
(2) join in the middle of the solvent after negative electrode active material material and conductive agent are evenly mixed, mix, be coated in above the collector;
(3) drying rolls, and cuts, and obtains negative pole;
(4) positive pole, negative pole, the barrier film that is inserted between positive pole and the negative pole are assembled;
(5) by the body that confluxes lug and terminal are linked together, in the battery case of packing into;
(6) inject electrolyte, sealing changes into reprocessing.
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