CN117727866A - Negative electrode structure of graphite battery and preparation method - Google Patents
Negative electrode structure of graphite battery and preparation method Download PDFInfo
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- CN117727866A CN117727866A CN202311573611.0A CN202311573611A CN117727866A CN 117727866 A CN117727866 A CN 117727866A CN 202311573611 A CN202311573611 A CN 202311573611A CN 117727866 A CN117727866 A CN 117727866A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 239000010439 graphite Substances 0.000 title claims abstract description 78
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000010410 layer Substances 0.000 claims abstract description 71
- 239000011247 coating layer Substances 0.000 claims abstract description 31
- 230000004048 modification Effects 0.000 claims abstract description 28
- 238000012986 modification Methods 0.000 claims abstract description 28
- 229920000642 polymer Polymers 0.000 claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002210 silicon-based material Substances 0.000 claims abstract description 12
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 9
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 4
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002243 precursor Substances 0.000 claims description 8
- 239000003623 enhancer Substances 0.000 claims description 7
- 239000007770 graphite material Substances 0.000 claims description 7
- 239000000376 reactant Substances 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000012512 characterization method Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000006258 conductive agent Substances 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 3
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims description 3
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 3
- 229910001887 tin oxide Inorganic materials 0.000 claims description 3
- 238000007740 vapor deposition Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000840 electrochemical analysis Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims description 2
- 238000005253 cladding Methods 0.000 claims 3
- 229910021450 lithium metal oxide Inorganic materials 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 4
- 150000004706 metal oxides Chemical class 0.000 abstract description 4
- 239000003792 electrolyte Substances 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 2
- 238000007086 side reaction Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a graphite battery negative electrode structure and a preparation method thereof, wherein the negative electrode structure comprises a current collector and a graphite negative electrode layer, a modified modification layer is arranged on the negative electrode structure, the outside of the graphite negative electrode layer is comprehensively coated with a coating layer, the modified modification layer is adhered with the coating layer, the modified modification layer is formed by stacking a silicon-based material, a lithium-rich metal oxide layer and a polymer reinforcing agent, and the polymer reinforcing agent is any one of sodium polyacrylate and polyacrylamide; through set up the coating in graphite negative pole layer outside, can prevent negative pole and electrolyte direct contact, reduce the side reaction and improve circulation stability to and carry out the mode of preliminary treatment, increase material, modified modification layer to graphite negative pole layer, improve the conductivity and the lithium ion diffusion performance of negative pole, improve specific capacity and circulation stability, and make modified modification layer have more adhesion, strengthen its and graphite negative pole layer between the combination, prevent the stripping of graphite negative pole material.
Description
Technical Field
The invention belongs to the technical field of graphite batteries, and particularly relates to a graphite battery negative electrode structure and a preparation method thereof.
Background
The graphite battery is a battery using a graphite material as a negative electrode, and has good charge and discharge performance and cycle life due to high conductivity and chemical stability of graphite, wherein the negative electrode in the graphite battery is generally composed of pure metal, alloy and hydrogen, and electrons are released to an external circuit by the negative electrode in the discharge process.
The publication number CN207993958U discloses a graphite negative electrode structure combination and a lithium battery cell, the stability, coulomb effect and specific capacity of the lithium battery cell are improved through the graphite negative electrode structure combination and the surface modification layer, but in the scheme, the following defects still exist:
firstly, the proposal does not solve the problem of stripping of the complete graphite negative electrode material in the long-term use process, and the surface modification layer can limit macromolecular groups to enter the graphite negative electrode layer, but can not thoroughly eliminate the stripping phenomenon, so that the graphite negative electrode can still be stripped in the longer-time cyclic charge and discharge process, and the performance of the battery cell is reduced;
second, although the surface modification layer has ion conduction characteristics such that conductive ions can be well transferred between the electrolyte and the graphite anode layer, this conduction process is still limited by the ion conduction properties of the surface modification layer itself, and if the ion conductivity of the surface modification layer is not high, the conductivity of the cell may still be affected.
Disclosure of Invention
The invention aims to provide a graphite battery negative electrode structure and a preparation method thereof, which are used for solving the problems that the existing negative electrode structure proposed in the background art can not completely eliminate the stripping problem in use and the electric conductivity is limited by the ion conductivity of a surface modification layer.
In order to achieve the above purpose, the present invention provides the following technical solutions: the negative electrode structure of the graphite battery comprises a current collector and a graphite negative electrode layer, wherein a modified modification layer is arranged on the negative electrode structure, the outside of the graphite negative electrode layer is fully coated with a coating layer, the modified modification layer is adhered to the coating layer, and the modified modification layer is formed by stacking a silicon-based material, a lithium-rich metal oxide layer and a polymer reinforcing agent.
As a preferable technical scheme in the invention, the polymer reinforcing agent is any one of sodium polyacrylate and polyacrylamide;
the silicon-based material is any one of a silicon film, silicon dioxide or a polymer containing silicon;
the polymer reinforcing agent is any one of medium lithium cobalt oxide or lithium iron phosphate.
As a preferable technical scheme in the invention, the current collector is copper foil.
In a preferred embodiment of the present invention, the coating layer is any one of aluminum oxide, tin oxide, and silicon nitride.
The invention also discloses a preparation method of the graphite battery anode structure, which comprises the anode structure, and specifically comprises the following steps:
step one: selecting a proper current collector;
step two: preparing a proper graphite anode layer raw material, uniformly mixing graphite powder, a conductive agent and a binder to form a plastic mixture, and coating a coating layer on the plastic mixture;
step three: forming the mixture into a negative electrode structure of a desired shape by using a pressing or injection molding technique;
step four: drying the formed negative electrode structure, removing water and solvent, and shaping the negative electrode structure by a cutting, compressing or rolling method to obtain the required size and shape;
step five: and attaching the silicon-based material in the modified modification layer on the coating layer in a negative pressure mode.
In the second step, the step of coating the graphite anode layer with the coating layer is as follows:
s1, selecting a proper material as a coating layer;
s2, preparing a graphite anode layer and ALD equipment, and setting proper technological parameters for the ALD equipment;
s3, coating layer deposition: alternately introducing a precursor and a reactant of the coating material to perform vapor deposition;
s4, through repeating the steps of introducing and removing the precursor and the reactant, stacking of multiple atomic layers is realized, and a uniform, compact and well-crystallized coating layer is formed;
s6, observing the morphology and thickness of the coating layer of the coated graphite sample by using a scanning electron microscope, and evaluating the electrochemical performance of the coated graphite sample by using an electrochemical test method and the like.
As a preferable technical scheme in the invention, in S2, the preparation work is completed after the graphite anode layer is subjected to pretreatment, wherein the pretreatment comprises cleaning and surface activation treatment.
In the second step, as a preferable technical scheme of the invention, the preparation method of the graphite anode layer raw material is as follows:
a. selecting a graphite material as a starting material;
b. crushing and refining the initial graphite material by using mechanical crushing equipment, and removing particles which do not meet the requirements by using a particle size classification technology, so as to retain particles with proper size;
c. surface treating the graphite particles to improve their electrical conductivity and increase contact area with other components;
d. the shape of graphite particles is regulated and controlled by a chemical method to increase the contact area between the particles, and micro-scale or nano-scale holes, depressions or polyhedral structures are formed on the surface of the graphite by the chemical method;
e. characterization and performance evaluation were performed on the treated graphite samples.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the coating layer is arranged outside the graphite negative electrode layer, so that the negative electrode is prevented from being in direct contact with electrolyte, side reactions are reduced, the circulation stability is improved, the graphite negative electrode layer is pretreated, materials are added, and the modification layer is modified, so that the conductivity and lithium ion diffusion performance of the negative electrode are improved, the specific capacity and the circulation stability are improved, the modification layer has higher adhesion, the combination between the modification layer and the graphite negative electrode layer is enhanced, and the stripping of the graphite negative electrode material is prevented.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural diagram of a modified modification layer according to the present invention;
FIG. 3 is a schematic diagram of the steps of the present invention.
In the figure:
100. a current collector; 101. a graphite negative electrode layer; 102. a coating layer;
200. modifying the modification layer; 201. a silicon-based material; 202. a lithium-rich metal oxide layer; 203. a polymer reinforcing agent.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1 to 3, the present invention provides a technical solution: the negative electrode structure of the graphite battery comprises a current collector 100 and a graphite negative electrode layer 101, wherein a modified modification layer 200 is arranged on the negative electrode structure, the outside of the graphite negative electrode layer 101 is comprehensively coated with a coating layer 102, the modified modification layer 200 is adhered to the coating layer 102, and the modified modification layer 200 is formed by stacking a silicon-based material 201, a lithium-rich metal oxide layer 202 and a polymer reinforcing agent 203.
In this embodiment, the polymer enhancer 203 is polyacrylamide;
the silicon-based material 201 is a polymer containing silicon;
the polymer enhancer 203 is lithium iron phosphate.
In this embodiment, the current collector 100 is a copper foil.
In this embodiment, the coating 102 is silicon nitride to improve the performance and safety of the battery, and these materials should have excellent electrochemical stability, conductivity, diffusibility and mechanical stability.
The invention also discloses a preparation method of the graphite battery anode structure, which comprises the anode structure, and specifically comprises the following steps:
step one: selecting a suitable current collector 100;
step two: preparing a proper graphite anode layer 101 raw material, uniformly mixing graphite powder, a conductive agent and a binder to form a plastic mixture, and coating a coating layer 102 on the plastic mixture;
step three: forming the mixture into a negative electrode structure of a desired shape by using a pressing or injection molding technique; the purpose of this step is to form a uniform electrode structure and ensure good electrical conductivity and mechanical stability;
step four: drying the formed negative electrode structure, removing water and solvent, and shaping the negative electrode structure by a cutting, compressing or rolling method to obtain the required size and shape;
step five: the silicon-based material 201 in the modified decorative layer 200 is attached to the clad layer 102 by negative pressure.
In the second embodiment, the step of coating the graphite anode layer 101 with the coating layer 102 is as follows:
s1, selecting a proper material as a coating layer;
s2, preparing a graphite anode layer 101 and an ALD device, and setting the ALD device to appropriate process parameters such as temperature, pressure and reaction gas flow rate, wherein the parameters are determined according to the selected coating materials and process requirements;
s3, coating layer deposition: alternately introducing a precursor and a reactant of the coating material to perform vapor deposition; typically, the precursor is a chemical that readily decomposes and reacts with the graphite surface; the reactant is used for removing precursor residues and promoting the reaction;
s4, through repeating the steps of introducing and removing the precursor and the reactant, stacking of multiple atomic layers is realized, and a uniform, compact and well-crystallized coating layer is formed;
s6, observing the morphology and thickness of the coating layer of the coated graphite sample by using a scanning electron microscope, and evaluating the electrochemical properties such as charge-discharge capacity, cycle stability and charge transmission rate by using electrochemical testing and other methods.
In this embodiment, in S2, the graphite anode layer 101 is subjected to pretreatment including cleaning and surface activation treatment to complete the preparation work.
In the second embodiment, in the step two, the preparation method of the raw material of the graphite anode layer 101 is as follows:
a. selecting a graphite material as a starting material;
b. crushing and refining the starting graphite material using a mechanical crushing apparatus, and removing undesirable particles using a size classification technique, such as screening or air classification, while retaining particles of a suitable size;
c. surface treatment of graphite particles to improve their conductivity and increase contact area with other components can be accomplished by physical or chemical means, e.g., by mechanical exfoliation, oxidation, reduction, etc., to form porous structures on the graphite particle surfaces, increasing active sites and electron transport pathways;
d. the shape of graphite particles is regulated and controlled by a chemical method to increase the contact area between the particles, and micro-scale or nano-scale holes, depressions or polyhedral structures are formed on the surface of the graphite by the chemical method;
e. characterization and performance evaluation were performed on the treated graphite samples.
Example 2
In this embodiment, the polymer enhancer 203 is polyacrylamide;
the silicon-based material 201 is silicon dioxide;
the polymer enhancer 203 is lithium iron phosphate.
In this embodiment, the coating layer 102 is tin oxide.
Example 3
In this embodiment, the polymer enhancer 203 is sodium polyacrylate;
the silicon-based material 201 is a silicon thin film;
the polymer enhancer 203 is a medium lithium cobalt oxide.
In this embodiment, the coating 102 is alumina.
Although embodiments of the present invention have been shown and described in detail with reference to the foregoing detailed description, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A graphite battery negative electrode structure comprising a current collector (100) and a graphite negative electrode layer (101), on which a modified modification layer (200) is provided, characterized in that: the outside of graphite negative pole layer (101) is fully cladding has cladding layer (102), and modified modification layer (200) and cladding layer (102) bonding, modified modification layer (200) are stacked by silica-based material (201), rich lithium metal oxide layer (202), polymer reinforcing agent (203).
2. The graphite battery negative electrode structure according to claim 1, wherein: the polymer reinforcing agent (203) is any one of sodium polyacrylate and polyacrylamide;
the silicon-based material (201) is any one of a silicon thin film, silicon dioxide or a polymer containing silicon;
the polymer enhancer (203) is any one of medium lithium cobalt oxide or lithium iron phosphate.
3. The graphite battery negative electrode structure according to claim 1, wherein: the current collector (100) is copper foil.
4. The graphite battery negative electrode structure according to claim 1, wherein: the coating layer (102) is any one of aluminum oxide, tin oxide and silicon nitride.
5. A method for preparing a negative electrode structure of a graphite battery, comprising the negative electrode structure of any one of claims 1 to 4, characterized in that: the method specifically comprises the following steps:
step one: selecting a suitable current collector (100);
step two: preparing a proper graphite anode layer (101) raw material, uniformly mixing graphite powder, a conductive agent and a binder to form a plastic mixture, and coating a coating layer (102) on the plastic mixture;
step three: forming the mixture into a negative electrode structure of a desired shape by using a pressing or injection molding technique;
step four: drying the formed negative electrode structure, removing water and solvent, and shaping the negative electrode structure by a cutting, compressing or rolling method to obtain the required size and shape;
step five: the silicon-based material (201) in the modified modification layer (200) is attached to the coating layer (102) by means of negative pressure.
6. The method for preparing the negative electrode structure of the graphite battery according to claim 4, wherein the method comprises the following steps: in the second step, the step of coating the graphite anode layer (101) with the coating layer (102) is as follows:
s1, selecting a proper material as a coating layer;
s2, preparing a graphite anode layer (101) and ALD equipment, and setting the ALD equipment to proper technological parameters;
s3, coating layer deposition: alternately introducing a precursor and a reactant of the coating material to perform vapor deposition;
s4, through repeating the steps of introducing and removing the precursor and the reactant, stacking of multiple atomic layers is realized, and a uniform, compact and well-crystallized coating layer is formed;
s6, observing the morphology and thickness of the coating layer of the coated graphite sample by using a scanning electron microscope, and evaluating the electrochemical performance of the coated graphite sample by using an electrochemical test method and the like.
7. The method for preparing the negative electrode structure of the graphite battery according to claim 6, wherein the method comprises the following steps: in S2, the graphite anode layer (101) is subjected to pretreatment including cleaning and surface activation treatment, and then ready for use.
8. The method for preparing the negative electrode structure of the graphite battery according to claim 4, wherein the method comprises the following steps: in the second step, the preparation method of the graphite anode layer (101) raw material comprises the following steps:
a. selecting a graphite material as a starting material;
b. crushing and refining the initial graphite material by using mechanical crushing equipment, and removing particles which do not meet the requirements by using a particle size classification technology, so as to retain particles with proper size;
c. surface treating the graphite particles to improve their electrical conductivity and increase contact area with other components;
d. the shape of graphite particles is regulated and controlled by a chemical method to increase the contact area between the particles, and micro-scale or nano-scale holes, depressions or polyhedral structures are formed on the surface of the graphite by the chemical method;
e. characterization and performance evaluation were performed on the treated graphite samples.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311573611.0A CN117727866A (en) | 2023-11-23 | 2023-11-23 | Negative electrode structure of graphite battery and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311573611.0A CN117727866A (en) | 2023-11-23 | 2023-11-23 | Negative electrode structure of graphite battery and preparation method |
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| CN117727866A true CN117727866A (en) | 2024-03-19 |
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| CN202311573611.0A Pending CN117727866A (en) | 2023-11-23 | 2023-11-23 | Negative electrode structure of graphite battery and preparation method |
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| Country | Link |
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| CN (1) | CN117727866A (en) |
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2023
- 2023-11-23 CN CN202311573611.0A patent/CN117727866A/en active Pending
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