CN109065878A - Preparation method of modified graphene composite graphite negative electrode material - Google Patents
Preparation method of modified graphene composite graphite negative electrode material Download PDFInfo
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- CN109065878A CN109065878A CN201810927704.1A CN201810927704A CN109065878A CN 109065878 A CN109065878 A CN 109065878A CN 201810927704 A CN201810927704 A CN 201810927704A CN 109065878 A CN109065878 A CN 109065878A
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- modified graphene
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 32
- 239000010439 graphite Substances 0.000 title claims abstract description 32
- 239000007773 negative electrode material Substances 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 12
- 239000011259 mixed solution Substances 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000010406 cathode material Substances 0.000 claims abstract description 9
- 239000002904 solvent Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims abstract description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- -1 aminopropyl Chemical group 0.000 claims description 6
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 238000000498 ball milling Methods 0.000 claims description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 claims description 2
- 238000010907 mechanical stirring Methods 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- 229920002554 vinyl polymer Chemical group 0.000 claims description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical group NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims 1
- 239000002041 carbon nanotube Substances 0.000 abstract description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 abstract description 3
- 239000007770 graphite material Substances 0.000 abstract description 3
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 abstract 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 7
- 235000019441 ethanol Nutrition 0.000 description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 150000002576 ketones Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- AVFZOVWCLRSYKC-UHFFFAOYSA-N 1-methylpyrrolidine Chemical class CN1CCCC1 AVFZOVWCLRSYKC-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002071 nanotube Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention relates to the technical field of new energy battery materials, and particularly discloses a preparation method of a modified graphene composite graphite negative electrode material, which comprises the following steps: mixing a silane coupling agent and a graphene material in a solvent to obtain a mixture A; stirring and filtering to obtain a mixture B; separating the mixture B to obtain a modified graphene material; preparing a modified graphene material and a graphite cathode material into a mixed solution; and after the mixed solution is subjected to centrifugal separation, drying the solid to obtain the modified graphene composite graphite cathode material. By utilizing the preparation method provided by the invention, the specific surface area and the surface energy of the graphene material are changed after the graphene material is treated, so that the dispersion of the graphene is more facilitated, the graphene is not easy to agglomerate, and after the graphene material and graphite are mixed and cured, the silane coupling agent can enable the carbon nanotube material and the graphite material to be crosslinked to form a carbon-carbon network structure, so that the cathode material has better conductivity and mechanical strength, and the service life of the battery is prolonged.
Description
Technical field
The present invention relates to new energy battery material technical field, specifically a kind of modified graphene composite graphite negative electrode material
Preparation method.
Background technique
The stable lattice structure of graphene makes carbon atom have outstanding electric conductivity, and the electronics in graphene moves in track
When dynamic, it will not be scattered due to lattice defect or introducing foreign atom, since interatomic force is very strong, at normal temperature,
Even if surrounding carbon atom telescopes, the interference that electronics is subject in graphene is also very small.
Graphene is the highest substance of mankind's known strength, also harder than diamond, and the intensity steel more best than in the world is also
Want upper 100 times high.
Since the single layer diameter general 1 of graphene is less than between nanometer, there is great specific surface area and surface energy, because
This, graphene is easy to reunite, and affects its uniformly dispersed and stability, cause with the composite material that is modified it
Between compatibility it is poor, make graphene uniform dispersion in the composite, to its surface modification it is very necessary.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of modified graphene composite graphite negative electrode material, to graphene into
Row surface modification, change surface can and surface tension, so that reducing reunion reaches better dispersion effect, then by modified graphene
Modified graphene composite graphite negative electrode material is made with after graphite mixing, carries out it using having as cell negative electrode material
Better conductive effect and mechanical strength.
In order to solve the above technical problems, the present invention provides a kind of preparation sides of modified graphene composite graphite negative electrode material
Method, comprising the following steps:
S1, silane coupling agent and grapheme material are blended in Solvents N-methyl pyrrolidines in the ratio of 0.01~0.2:1
Mixture A is obtained in ketone；
Mixture B is obtained by filtration after stirring 1~2h in the case where temperature is 20~90 DEG C in S2, mixture A；
S3, mixture B is centrifugally separating to obtain modified graphene material；
S4, modified graphene material and graphite cathode material are mixed according to the ratio of 1:4~30, solvent are added,
It is made into the solid mixed solution containing 5%-25%；
S5, after being centrifugated the solid mixed solution containing 5%-25%, solid is taken to dry to obtain modified graphene composite stone
Black negative electrode material.
Further, the particle size range of graphene described in S1 is 0.1nm-50nm, and the general formula of the silane coupling agent is
R-Si(OR1)3Or R R2-Si(OR1)2。
Specifically, the R is hydrogen atom, methyl, ethyl, propyl, butyl, phenyl, cyclohexyl, vinyl, acrylic, ammonia
Propyl, aminoethylaminopropyl, mercaptopropyi or anilinomethyl；R1For methyl or ethyl, R2For hydrogen atom, methyl or ethyl.
Further, the mode of mixing described in S1 and S4 is one of mechanical stirring, ultrasonic disperse or ball milling dispersion
Or it is several.
Further, solvent described in S4 is water, C1-5Fatty alcohol or one of ether or a variety of, the C1-5Rouge
Fat alcohol is ethyl alcohol, methanol, propyl alcohol, butanol or amylalcohol.
Specifically, drying temperature described in S5 is 50~300 DEG C, and drying time is 1~5h, is dried in nitrogen atmosphere
It is dry.
The beneficial effects of the present invention are: being modified grapheme material using preparation method provided by the invention, change
The specific surface area of grapheme material and surface can, to be more advantageous to the dispersion of graphene, and be not susceptible to reunite, then will change
Property graphene and graphite carry out it is mixing cured, the silane coupling agent in modified graphene can make carbon nano-tube material and graphite material
Material crosslinks, and forms carbon-to-carbon network structure, so that negative electrode material is had better electric conductivity and mechanical strength, extends battery
Service life.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
In an embodiment of the present invention, a kind of preparation side of modified graphene composite graphite negative electrode material is specifically disclosed
Method, comprising the following steps:
S1, silane coupling agent and grapheme material are blended in Solvents N-methyl pyrrolidines in the ratio of 0.01~0.2:1
Mixture A is obtained in ketone；
Mixture B is obtained by filtration after stirring 1~2h in the case where temperature is 20~90 DEG C in S2, mixture A；
S3, mixture B is centrifugally separating to obtain modified graphene material；
S4, modified graphene material and graphite cathode material are mixed according to the ratio of 1:4~30, solvent are added,
It is made into the solid mixed solution containing 5%-25%；
S5, will be after the solid mixed solution centrifuge separation containing 5%-25%, taking solid in temperature is 50~300 DEG C, in nitrogen
1~5h of drying obtains modified graphene composite graphite negative electrode material.
Embodiment 1:
By 2g silane coupling agent HSi (OC6H5)3It is blended in 30gN- methyl pyrrolidone and obtains with 10g grapheme material
Mixture A；Mixture A is filtered after 20 DEG C of stirring 1h, obtains mixture B；Mixture B is centrifugally separating to obtain modified carbon nano tube
Tube material；Modified graphene material and graphite cathode material are made into the alcohol mixed solution containing 25% admittedly according to the ratio of 1:4；
After mixed solution is centrifugated, modified graphene composite graphite negative electrode material is obtained after taking 50 DEG C of drying 5h of solid, as electricity
Pond negative electrode material uses.
Embodiment 2:
By 0.1g silane coupling agent CH3Si(OCH)3It is blended in 50gN- methyl pyrrolidone and obtains with 10g grapheme material
To mixture A；Mixture A is filtered after 90 DEG C of stirring 1h, obtains mixture B；Mixture B is centrifugally separating to obtain carbon modified to receive
Nanotube material；By modified graphene material and graphite cathode material according to the ratio of 1:30 be made into admittedly containing 5% propyl alcohol mix it is molten
Liquid after being centrifugated mixed solution, obtains modified graphene composite graphite negative electrode material after taking 300 DEG C of drying 1h of solid, makees
For cell negative electrode material use.
Embodiment 3:
By 1g silane coupling agent (CH3)2Si(OCH)3It is blended in 20gN- methyl pyrrolidone and obtains with 10g grapheme material
To mixture A；Mixture A is filtered after 50 DEG C of stirring 2h, obtains mixture B；Mixture B is centrifugally separating to obtain carbon modified to receive
Nanotube material；The mixing containing 10% admittedly is made into after modified graphene material and graphite cathode material are added water according to the ratio of 1:10
Solution after being centrifugated mixed solution, obtains modified graphene composite graphite negative electrode material after taking 10 DEG C of drying 3h of solid, makees
For cell negative electrode material use.
Comparative example: graphite cathode
Performance test
Negative electrode material and conductive carbon black are ground in mortar is uniformly mixed it, is added to the N- crassitude of PVDF
In ketone (NMP) solution, stir evenly, slurry is made, wherein negative electrode material: conductive carbon black: the mass ratio of PVDF is 90:5:5,
It is coated on copper foil, pole piece is made in drying, rolling.Being made with metal lithium sheet to electrode, Celgard2400 is diaphragm,
1mol/LLiPF6/EC (ethylene carbonate)+DMC (dimethyl carbonate)+EMC (methyl ethyl carbonate rouge) (volume ratio 1: 1: 1) is electrolysis
Liquid is assembled into simulated battery in the glove box of logical argon gas, carries out electrochemical property test after standing 12h.
The beneficial effects of the present invention are: being modified grapheme material using preparation method provided by the invention, change
The specific surface area of grapheme material and surface can, to be more advantageous to the dispersion of graphene, and be not susceptible to reunite, then will change
Property graphene and graphite carry out it is mixing cured, the silane coupling agent in modified graphene can make carbon nano-tube material and graphite material
Material crosslinks, and forms carbon-to-carbon network structure, so that negative electrode material is had better electric conductivity and mechanical strength, extends battery
Service life.
Above disclosed be only a kind of preferred embodiment of the invention, cannot limit the present invention's certainly with this
Interest field, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (6)
1. a kind of preparation method of modified graphene composite graphite negative electrode material, which comprises the following steps:
S1, silane coupling agent and grapheme material are blended in solvent N-methyl pyrilidone in the ratio of 0.01~0.2:1
Obtain mixture A；
Mixture B is obtained by filtration after stirring 1~2h in the case where temperature is 20~90 DEG C in S2, mixture A；
S3, mixture B is centrifugally separating to obtain modified graphene material；
S4, modified graphene material and graphite cathode material are mixed according to the ratio of 1:4~30, solvent is added, is made into
Gu the mixed solution containing 5%-25%；
S5, will after the solid mixed solution centrifuge separation containing 5%-25%, take solid dry to obtain modified graphene composite graphite it is negative
Pole material.
2. a kind of preparation method of modified graphene composite graphite negative electrode material according to claim 1, which is characterized in that
The particle size range of graphene described in S1 is 0.1nm-50nm, and the general formula of the silane coupling agent is R-Si (OR1)3Or R R2-Si
(OR1)2。
3. a kind of preparation method of modified graphene composite graphite negative electrode material according to claim 2, which is characterized in that
The R is hydrogen atom, methyl, ethyl, propyl, butyl, phenyl, cyclohexyl, vinyl, acrylic, aminopropyl, aminoethyl ammonia third
Base, mercaptopropyi or anilinomethyl；R1For methyl or ethyl, R2For hydrogen atom, methyl or ethyl.
4. a kind of preparation method of modified graphene composite graphite negative electrode material according to claim 1, which is characterized in that
The mode of mixing described in S1 and S4 is one or more of mechanical stirring, ultrasonic disperse or ball milling dispersion.
5. a kind of preparation method of modified graphene composite graphite negative electrode material according to claim 1, which is characterized in that
Solvent described in S4 is water, C1-5Fatty alcohol or one of ether or a variety of.
6. a kind of preparation method of modified graphene composite graphite negative electrode material according to claim 1, which is characterized in that
Drying temperature described in S5 is 50~300 DEG C, and drying time is 1~5h, is dried in nitrogen atmosphere.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459743A (en) * | 2019-07-23 | 2019-11-15 | 东莞市创明电池技术有限公司 | Lithium ion battery negative material and preparation method thereof applied to fast charging and discharging |
| CN110745819A (en) * | 2019-10-25 | 2020-02-04 | 哈尔滨工业大学 | Method for modifying surface of graphite material by using silane coupling agent, lithium ion battery cathode and preparation method thereof |
| CN113161545A (en) * | 2021-05-18 | 2021-07-23 | 芜湖天弋能源科技有限公司 | Graphene and graphite composite material, preparation method and application of graphene and graphite composite material as lithium ion battery negative electrode material |
| CN113809299A (en) * | 2021-09-14 | 2021-12-17 | 远景动力技术(江苏)有限公司 | Negative electrode active material, negative electrode sheet, preparation method and application of negative electrode sheet |
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