CN117727908A - Silicon-carbon composite anode material, lithium ion battery and preparation method of lithium ion battery - Google Patents
Silicon-carbon composite anode material, lithium ion battery and preparation method of lithium ion battery Download PDFInfo
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- CN117727908A CN117727908A CN202410016068.2A CN202410016068A CN117727908A CN 117727908 A CN117727908 A CN 117727908A CN 202410016068 A CN202410016068 A CN 202410016068A CN 117727908 A CN117727908 A CN 117727908A
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- 239000011870 silicon-carbon composite anode material Substances 0.000 title claims abstract description 34
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000002153 silicon-carbon composite material Substances 0.000 claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 31
- 239000010439 graphite Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000010426 asphalt Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 21
- 239000005543 nano-size silicon particle Substances 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 6
- 239000012298 atmosphere Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 229910021382 natural graphite Inorganic materials 0.000 claims description 6
- 238000005229 chemical vapour deposition Methods 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052710 silicon Inorganic materials 0.000 abstract description 9
- 239000010703 silicon Substances 0.000 abstract description 9
- 239000010405 anode material Substances 0.000 abstract description 8
- 238000003756 stirring Methods 0.000 description 10
- 235000015220 hamburgers Nutrition 0.000 description 8
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011868 silicon-carbon composite negative electrode material Substances 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000009818 secondary granulation Methods 0.000 description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000724 energy-dispersive X-ray spectrum Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000011856 silicon-based particle Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a silicon-carbon composite anode material, a lithium ion battery and a preparation method thereof, wherein the preparation method comprises the following steps: obtaining a silicon-carbon composite sheet; granulating the mixture of the silicon-carbon composite sheet, the flake graphite and the asphalt to obtain a silicon-carbon composite prefabricated material; wrapping the surface of the silicon-carbon composite prefabricated material to obtain the silicon-carbon composite anode material; the problem that the cycle efficiency is obviously reduced due to the limitation of charging expansion of the simple silicon anode material is effectively solved.
Description
Technical Field
The invention relates to the field of new energy materials, in particular to a silicon-carbon composite anode material of a long-cycle high-capacity lithium ion battery and a preparation method thereof.
Background
In the new energy field, lithium ion batteries have been widely used in portable electronic appliances such as video cameras, mobile phones, notebook computers, and the like due to their excellent characteristics of high energy density, high power density, good cycle performance, environmental friendliness, structural diversity, low price, and the like. In recent decades, the rapid development of lithium ion batteries has led to the vigorous development of global industries such as communication and energy, and once the energy density and power density of lithium ion batteries can be further and greatly improved, the lithium ion batteries are an ideal power source for high-end energy storage systems such as pure electric vehicles, hybrid electric vehicles, space technologies and the like.
The current lithium ion battery adopts artificial graphite or natural graphite as the negative electrode material, the highest gram charge capacity is 372mAh, the current graphite negative electrode product charge gram capacity reaches 360mAh, and the future improvement space is not large.
The theoretical gram capacity of the silicon-based anode material reaches 4200mAh/g, and a wide development space is available in the field of lithium ion batteries in the future, but the silicon-based anode material has obvious volume expansion in the charging process, so that crystal lattice breakage is caused, the charging gram capacity is obviously reduced, the cycle life is obviously shortened, and the common cycle life is about 500 times. Therefore, development of a silicon-based anode material with better cycle performance is imperative.
Disclosure of Invention
In view of the above, the invention provides a silicon-carbon composite anode material for a lithium ion battery, which solves the problem that the cycle efficiency is obviously reduced due to the limitation of charge expansion of a pure silicon anode material.
In addition, the invention also provides a preparation method of the silicon-carbon composite anode material and a lithium ion battery.
In a first aspect, the preparation method of the silicon-carbon composite anode material includes:
obtaining a silicon-carbon composite sheet;
granulating the mixture of the silicon-carbon composite sheet, the flake graphite and the asphalt to obtain a silicon-carbon composite prefabricated material;
and wrapping the surface of the silicon-carbon composite prefabricated material to obtain the silicon-carbon composite anode material.
In the disclosed and possible embodiments, the weight ratio of the silicon-carbon composite sheet, the flake graphite and the pitch is 0.1-0.5:0.2-0.7: 0.05 to 0.2.
In the disclosed and possible embodiments, the encapsulation treatment is performed on the silicon carbon composite preform by means of methane chemical vapor deposition.
In the present disclosure and possible embodiments, the method of granulating comprises:
and (3) preparing the mixture of the silicon-carbon composite sheet, the flake graphite and the asphalt into particles at the temperature of 500-1000 ℃, carrying out heat preservation treatment on the particles for 0.5-10 h, and then cooling to room temperature to obtain the silicon-carbon composite prefabricated material.
In the present disclosure and possible embodiments, the method for preparing a silicon-carbon composite sheet includes:
graphite flakes were used to prepare: asphalt: and (3) loading the mixture of nano silicon into a granulating kettle, and granulating the mixture at the temperature of 500-1000 ℃ in an inert atmosphere to obtain the silicon-carbon composite sheet.
In the present disclosure and possible embodiments, the graphite flakes: asphalt: the weight ratio of the nano silicon is 0.7-0.9:0.05-0.2:0.01-0.15.
In the disclosed and possible embodiments, the temperature of the granulating kettle is raised from room temperature to 500-1000 ℃ in a non-isothermal manner at a temperature raising rate of 2-10 ℃/min.
In the disclosed and possible embodiments, the graphite flakes are artificial or natural graphite, and have a particle size D50 of 1-30 microns and a thickness and a maximum width of one side of less than 0.5.
In a second aspect, the silicon-carbon composite anode material is prepared by the method in the first aspect.
In a third aspect, the lithium ion battery includes a negative electrode piece, where the negative electrode piece is made of the silicon-carbon composite negative electrode material in the second aspect.
The invention has the following beneficial effects:
according to the silicon-carbon composite anode material with the hamburger structure for the high-capacity lithium ion battery, firstly, the two-dimensional crystal structure characteristics of flaky graphite particles are utilized, and a multi-layer hamburger structure is formed through stacking of the flaky particles, so that lithium ions can enter a transmission channel of a graphite crystal in a rich manner, the transmission distance is shortened, and the multiplying power performance of the anode material is improved; then, by controlling the proportion of the flaky graphite particles, asphalt and nano silicon, the silicon nano particles are attached to the surfaces of the flaky graphite particles, and further the silicon-carbon composite flaky particles and the flaky graphite particles are mutually stacked to obtain the silicon-carbon composite anode material with a hamburger structure, so that the structural stability and the conductivity of the silicon-based anode material are effectively improved, the limiting field effect of the graphite particles on the volume expansion of the silicon nano particles is improved, the problems of particle breakage and SEI film thickening caused by no release of stress in the expansion process of the silicon-based particles are reduced, and the cycle performance of the anode material is further improved; compared with the negative electrode material obtained by the traditional granulating method, the silicon-carbon composite negative electrode material and the lithium ion battery manufactured by the negative electrode material have better performance.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a silicon-carbon composite anode material prepared in example 1 of the present invention;
FIG. 2 is an electron microscope view of the silicon-carbon composite anode material prepared in example 1 of the present invention;
FIG. 3 is an X-ray diffraction pattern of the silicon-carbon composite anode material prepared in example 1 of the present invention;
fig. 4 is a first cycle charge-discharge curve diagram of a lithium ion battery using a negative electrode tab prepared from the silicon-carbon composite negative electrode material prepared in example 1 of the present invention as a working electrode;
fig. 5 is a cycle chart of a lithium ion battery using a negative electrode tab prepared from the silicon-carbon composite negative electrode material prepared in example 1 of the present invention as a working electrode.
Detailed Description
The present disclosure is described below based on embodiments, but it is worth noting that the present disclosure is not limited to these embodiments. In the following detailed description of the present disclosure, certain specific details are set forth in detail. However, for portions not described in detail, those skilled in the art can also fully understand the present disclosure. It should be noted that: the following comparative examples are not prior art, but are provided merely for comparison with the examples and are not intended to limit the invention.
Meanwhile, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".
The preparation method of the silicon-carbon composite anode material in the embodiment of the disclosure specifically comprises the following steps:
(1) Crushing artificial graphite or natural graphite into flaky particles, wherein the D50 of the flaky particles is 1-30 microns, and the thickness and the maximum width of the flaky particles are less than 0.5;
(2) Flake graphite particles: asphalt (softening point greater than 150 °): the nano silicon is fully mixed according to the weight ratio of 0.7-0.9:0.05-0.2:0.01-0.15 to form a mixture.
(3) And (3) putting the mixture into a granulating kettle for granulating, heating the mixture to 500-1000 ℃ from room temperature in an inert atmosphere at a heating rate of 2-10 ℃/min in a non-isothermal manner, and cooling the mixture to room temperature after the granulating is finished and the temperature is kept for 0.5-10 hours to obtain the silicon-carbon composite prefabricated material with the hamburger structure.
(4) And coating the silicon-carbon composite prefabricated material to finally obtain the silicon-carbon composite anode material of the corresponding embodiment.
Example 1
1. Preparation of silicon-carbon composite anode material
(1) Pulverizing artificial graphite or natural graphite into flake particles with D50 of 10.89 μm and average thickness to maximum width of 0.42;
(2) Lamellar graphite particles are formed: asphalt: the nano silicon is fully mixed according to the weight ratio of 0.8:0.1:0.1 to form a mixture.
(3) And (3) loading the mixture into a high-temperature reaction kettle for granulating, carrying out non-isothermal temperature rise from room temperature to 800 ℃ at a temperature rise rate of 5 ℃/min in an inert atmosphere, and cooling to room temperature after heat preservation for 4 hours to obtain the silicon-carbon mixed sheet.
(4) Fully mixing the silicon-carbon mixed sheet layer, the lamellar graphite particles and the asphalt according to the weight ratio of 0.5:0.45:0.05, and filling the mixture into a high-temperature reaction kettle for secondary granulation to obtain the silicon-carbon composite prefabricated material.
(5) And performing methane chemical vapor deposition on the silicon-carbon composite prefabricated material to finally obtain the hamburger structure silicon-carbon composite anode material.
The carbon material prepared in example 1 of the present invention was prepared into a lithium ion battery according to the following method, and the electrochemical properties thereof were measured.
2. Manufacturing of lithium ion battery
Weighing a carbon material, a conductive agent (Super P) and a binder (CMC 2200& SBR 307) according to a certain mass ratio for standby (the mass ratio of the four materials is 8:1:0.5:0.5 respectively), firstly adding a proper amount of deionized water as a solvent into a stirring tank, then adding the weighed CMC2200 into the stirring tank, and stirring for 30min at a rotating speed of 600 revolutions per minute in vacuum; adding the weighed conductive agent (Super P) into a stirring tank, firstly stirring for 10min at a rotation speed of 100 rpm in vacuum, and then stirring for 90min at a rotation speed of 600 rpm in vacuum; adding the weighed carbon material, firstly stirring for 10min at a rotating speed of 100 rpm in vacuum, and then stirring for 60min at a rotating speed of 600 rpm in vacuum; finally, adding the weighed SBR307 into a stirring tank, and stirring for 30min in vacuum at the rotating speed of 600 revolutions per minute; the prepared slurry was coated on a copper foil current collector with a coating thickness of 15 μm. After coating, drying in a vacuum oven at 110℃for 12h, followed by rolling (a roll thickness of 5um, a compaction density of 1.5-2.0). After rolling, the grade sheet was cut into round pole pieces with a diameter of 14mm using a sheet punching machine. And (3) putting the punched grade sheet into a glove box filled with high-purity argon atmosphere to assemble the CR2032 button cell. The method comprises the steps of taking a lithium metal sheet as a counter electrode, taking a pole piece as a working electrode, taking a polypropylene macroporous membrane as a diaphragm (Celgard 2400), putting the lithium metal sheet into a negative electrode shell, putting the diaphragm stained with electrolyte, injecting 100 mu L of electrolyte (the electrolyte is a mixed solution of 1mol/L lithium hexafluorophosphate dissolved in Ethylene Carbonate (EC) and dimethyl carbonate (DMC) (volume ratio is 1:1)), putting an electrode surface with an active substance towards the diaphragm, and then putting a gasket, a spring piece and a positive electrode shell in sequence. After excess electrolyte is pressed out lightly, the battery is packaged on a sealing machine and kept stand for 24 hours at room temperature.
3. Electrochemical performance test of lithium ion battery, the results are shown in fig. 2-5:
as can be seen from fig. 1, the silicon nanoparticles are coated on the surface of the graphite flake particles and stacked in a hamburger structure.
As can be seen from the EDS spectrum of fig. 3, the nano-particles on the surface of the graphite flake particles mainly contain silicon.
Table 1 below shows the EDS scan results for position 1 in the electron microscope view of FIG. 2; as can be seen from the EDS spectrum of table 1, the nanoparticle of the surface of the graphite flake particles at 1 in fig. 2 is mainly composed of silicon.
Table 1 EDS scan results at 1 in fig. 2
| Element | Atomic％ | Atomic％Error | Weight％ |
| C | 65.6 | 0.7 | 44.9 |
| Si | 34.4 | 0.1 | 55.1 |
As can be seen from fig. 3, a sharp graphite peak is generated near 26 °, which indicates that the silicon-carbon anode uses graphite material as a matrix, and a silicon crystal peak of silicon nanoparticles is generated near 28 °, which indicates that the loaded silicon nanoparticles are crystalline silicon-based materials.
As can be seen from FIGS. 4 and 5, the first reversible capacity and the first effect of the sample SiX-5 are 516.1mAh/g and 93.25%, respectively, and the sample has a slow capacity decay during the cycle and a capacity retention rate of 85.6% after 100 cycles.
Example 2
The preparation methods of the silicon-carbon composite anode material are different, and the preparation methods of the lithium battery are the same.
(1) Crushing natural graphite into flaky particles, wherein the D50 is 15.20 microns, and the average ratio of the thickness to the maximum width of a flaky surface is 0.45;
(2) Lamellar graphite particles are formed: asphalt: the nano silicon is fully mixed according to the weight ratio of 0.85:0.1:0.05 to form a mixture.
(3) And (3) loading the mixture into a high-temperature reaction kettle for granulating, carrying out non-isothermal temperature rise from room temperature to 800 ℃ at a temperature rise rate of 3 ℃/min in an inert atmosphere, and cooling to room temperature after heat preservation for 4 hours to obtain the silicon-carbon mixed sheet.
(4) Fully mixing the silicon-carbon mixed sheet layer, the lamellar graphite particles and the asphalt according to the weight ratio of 0.45:0.45:0.05, and filling the mixture into a high-temperature reaction kettle for secondary granulation to obtain the silicon-carbon composite prefabricated material.
And performing methane chemical vapor deposition on the silicon-carbon composite prefabricated material to finally obtain the hamburger structure silicon-carbon composite anode material. The first reversible capacity and the first effect are 451.8mAh/g and 94.20 percent respectively, the capacity of the sample decays slowly in the circulating process, and the capacity retention rate is 87.3 percent after 100 times of circulation
Example 3
The preparation methods of the silicon-carbon composite anode material are different, and the preparation methods of the lithium battery are the same.
(1) Crushing artificial graphite into flaky particles, wherein the D50 is 14.20 microns, and the average ratio of the thickness to the maximum width of a flaky surface is 0.38;
(2) Lamellar graphite particles are formed: asphalt: the nano silicon is fully mixed according to the weight ratio of 0.7:0.1:0.2 to form a mixture.
(3) And (3) loading the mixture into a high-temperature reaction kettle for granulating, carrying out non-isothermal temperature rise from room temperature to 800 ℃ at a temperature rise rate of 10 ℃/min in an inert atmosphere, and cooling to room temperature after heat preservation for 4 hours to obtain the silicon-carbon mixed sheet.
(4) Fully mixing the silicon-carbon mixed sheet layer, the lamellar graphite particles and the asphalt according to the weight ratio of 0.42:0.5:0.08, and filling the mixture into a high-temperature reaction kettle for secondary granulation to obtain the silicon-carbon composite prefabricated material.
And performing methane chemical vapor deposition on the silicon-carbon composite prefabricated material to finally obtain the hamburger structure silicon-carbon composite anode material. The first reversible capacity and the first effect are 673mAh/g and 82.3 percent respectively, the capacity of the sample decays slowly in the circulating process, and the capacity retention rate is 64.5 percent after 100 times of circulation
The above examples are merely representative of embodiments of the present disclosure, which are described in more detail and are not to be construed as limiting the scope of the present disclosure. It should be noted that modifications, equivalent substitutions, improvements, etc. can be made by those skilled in the art without departing from the spirit of the present disclosure, which are all within the scope of the present disclosure. Accordingly, the scope of protection of the present disclosure should be determined by the following claims.
Claims (10)
1. The preparation method of the silicon-carbon composite anode material is characterized by comprising the following steps of:
obtaining a silicon-carbon composite sheet;
granulating the mixture of the silicon-carbon composite sheet, the flake graphite and the asphalt to obtain a silicon-carbon composite prefabricated material;
and wrapping the surface of the silicon-carbon composite prefabricated material to obtain the silicon-carbon composite anode material.
2. The method for preparing the silicon-carbon composite anode material according to claim 1, wherein the method comprises the following steps:
the weight ratio of the silicon-carbon composite sheet to the flaky graphite to the asphalt is 0.1-0.5:0.2-0.7: 0.05 to 0.2.
3. The method for preparing the silicon-carbon composite anode material according to claim 1 or 2, characterized in that:
and carrying out the wrapping treatment on the silicon-carbon composite prefabricated material in a methane chemical vapor deposition mode.
4. A method of producing a silicon-carbon composite anode material according to claim 3, characterized in that the granulating method comprises:
and (3) preparing the mixture of the silicon-carbon composite sheet, the flake graphite and the asphalt into particles at the temperature of 500-1000 ℃, carrying out heat preservation treatment on the particles for 0.5-10 h, and then cooling to room temperature to obtain the silicon-carbon composite prefabricated material.
5. The method for producing a silicon-carbon composite anode material according to claim 1, 2 or 4, characterized in that the method for producing a silicon-carbon composite sheet comprises:
graphite flakes were used to prepare: asphalt: and (3) loading the mixture of nano silicon into a granulating kettle, and granulating the mixture at the temperature of 500-1000 ℃ in an inert atmosphere to obtain the silicon-carbon composite sheet.
6. The method for preparing the silicon-carbon composite anode material according to claim 5, wherein the method comprises the following steps:
the flake graphite: asphalt: the weight ratio of the nano silicon is 0.7-0.9:0.05-0.2:0.01-0.15.
7. The method for preparing the silicon-carbon composite anode material according to claim 1, 2, 4 or 6, characterized in that:
the temperature of the granulating kettle is raised from room temperature to 500-1000 ℃ in a non-isothermal way at a temperature raising rate of 2-10 ℃/min.
8. The method for preparing the silicon-carbon composite anode material according to claim 7, wherein the method comprises the following steps:
the flake graphite is artificial graphite or natural graphite, the grain diameter D50 is 1-30 microns, and the thickness and the one-sided maximum width are smaller than 0.5.
9. A silicon-carbon composite anode material is characterized in that:
a method according to any one of claims 1 to 8.
10. Lithium ion battery, including negative pole piece, its characterized in that:
the silicon-carbon composite anode material of claim 9 is adopted as the anode piece.
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| CN202410016068.2A CN117727908A (en) | 2024-01-03 | 2024-01-03 | Silicon-carbon composite anode material, lithium ion battery and preparation method of lithium ion battery |
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