CN110931788A - Graphite negative electrode material of lithium ion battery and preparation method thereof - Google Patents
Graphite negative electrode material of lithium ion battery and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 51
- 239000010439 graphite Substances 0.000 title claims abstract description 51
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 46
- 239000007773 negative electrode material Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 28
- 238000005087 graphitization Methods 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000010405 anode material Substances 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000009818 secondary granulation Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 27
- 239000002994 raw material Substances 0.000 claims description 22
- 239000011331 needle coke Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 15
- 239000010406 cathode material Substances 0.000 claims description 15
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 13
- 239000005011 phenolic resin Substances 0.000 claims description 13
- 229920001568 phenolic resin Polymers 0.000 claims description 13
- 238000007493 shaping process Methods 0.000 claims description 13
- 230000001186 cumulative effect Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 239000010426 asphalt Substances 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
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- 229910003481 amorphous carbon Inorganic materials 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 3
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- 238000009825 accumulation Methods 0.000 description 3
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- 230000002860 competitive effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000005469 granulation Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
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- 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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
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- 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
- H01M4/626—Metals
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- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
本发明公开了一种锂离子电池石墨负极材料及其制备方法，其中所述锂离子电池石墨负极材料中D50为7.5~8.5μm、D90为14~16μm、及D100为21~26μm，且所述锂离子电池石墨负极材料的BET比表面积为2.0~2.3 m2/g、振实密度为1.0~1.2g/cm2。本发明制备的锂离子电池石墨负极材料具有优异的低温和倍率性能，二次造粒可将更小颗粒的一次粒子粘结起来，缩减锂离子在石墨晶体中的传输距离，铜粉和纳米导电碳经过石墨化工序后可包覆在石墨颗粒的表面，有效降低石墨表面的电荷传递阻抗，采用的树脂经过包覆和石墨化工序后，成为一种无定型碳，有效加快锂离子的扩散速率。
The invention discloses a lithium ion battery graphite negative electrode material and a preparation method thereof, wherein in the lithium ion battery graphite negative electrode material, D50 is 7.5-8.5 μm, D90 is 14-16 μm, and D100 is 21-26 μm, and the The BET specific surface area of the graphite anode material for lithium ion batteries is 2.0-2.3 m 2 /g, and the tap density is 1.0-1.2 g/cm 2 . The lithium ion battery graphite negative electrode material prepared by the invention has excellent low temperature and rate performance, and the secondary granulation can bond the primary particles of smaller particles, shorten the transmission distance of lithium ions in the graphite crystal, and the copper powder and nanometer conductive Carbon can be coated on the surface of graphite particles after the graphitization process, which can effectively reduce the charge transfer resistance of the graphite surface. After the coating and graphitization process, the resin used becomes an amorphous carbon, which effectively accelerates the diffusion rate of lithium ions .
Description
Technical Field
The invention belongs to the technical field of negative electrode materials, and particularly relates to a graphite negative electrode material of a lithium ion battery and a preparation method thereof.
Background
In recent years, energy crisis and environmental protection are becoming two major concerns of people, new energy and energy storage systems which are pollution-free and renewable are actively searched and developed in various countries, and lithium ion batteries have the advantages of environmental friendliness, long cycle life, high energy density and the like and are widely and deeply researched by people. At present, lithium ion batteries are widely applied in the fields of mobile phones, notebooks, electric automobiles and the like; with the increasing international competitive situation, chemical power sources under extreme conditions gradually attract the attention of various countries, and particularly, lithium ion batteries under low-temperature and high-current conditions become hot spots concerned by various countries in the technical fields of military equipment, national defense safety and the like.
Graphite is always one of the most common cathode materials after the commercialization of the lithium ion battery, and is also one of the important factors influencing the low-temperature and rate performance of the lithium ion battery, and with the continuous development of economy and technology, people have great needs for chemical power sources which can be safely used under extreme conditions, such as batteries used by electric automobiles in winter in the north of China; in order to improve the low-temperature and rate-multiplying performance of graphite lithium ion battery cathode materials, researchers have tried many preparation and modification methods and obtained corresponding achievements, for example, patent CN105375030A adopts a manner of intercalation micro-expansion modification of natural flake graphite by concentrated acid and carbon source coating granulation to improve the low-temperature and rate-multiplying performance of natural graphite, but using a manner of strong acid, there are many difficulties in actual industrial production, and the low-temperature performance of the graphite lithium ion battery cathode materials needs to be further improved.
Disclosure of Invention
The invention aims to provide a graphite cathode material of a lithium ion battery to overcome the technical problems.
The technical purpose of the invention is realized by the following technical scheme:
a graphite negative electrode material for lithium ion batteries, wherein the particle diameter D50 of 50% cumulative part from the small particle side is 7.5 to 8.5 μm, the particle diameter D90 of 90% cumulative part from the small particle side is 14 to 16 μm, and the particle diameter D100 of 100% cumulative part from the small particle side is 21 to 26 μm, and the BET specific surface area of the graphite negative electrode material for lithium ion batteries is 2.0 to 2.3m2The tap density is 1.0-1.2 g/cm2。
Further, the relationships among D50, D90 and D100 are preferably as follows: D90/D50 is more than or equal to 1.7 and less than or equal to 1.9, and D100/D50 is more than or equal to 2.5 and less than or equal to 3.3.
The invention also aims to provide a preparation method of the lithium ion battery graphite cathode material, which bonds small-particle graphite crystals together through secondary granulation, coats the graphite surface with metal copper, nano conductive carbon and amorphous carbon, and improves the low-temperature and rate performance of the graphite cathode through combination of three methods.
Which comprises the following steps of,
(1) shaping: grinding and shaping needle coke serving as a raw material, wherein D50, D90 and D100 in the shaped raw material are respectively 3-5 microns, 7-10 microns and 16-20 microns;
(2) and (3) secondary granulation: mixing the shaped raw materials with a binder, putting the mixture into a reaction kettle for high-temperature reaction, and cooling to room temperature after the reaction is finished to obtain a mixture;
(3) coating: mixing the mixture obtained in the step (1) with resin for coating treatment, wherein the coating temperature is 1100-1300 ℃;
(4) graphitization: and (3) carrying out graphitization treatment on the material coated in the step (2), wherein the graphitization temperature is 3000-3200 ℃, and the heat preservation time is 10-12 h, so that the lithium ion battery graphite cathode material with excellent low temperature and rate performance can be obtained.
Further, in the step (1), the needle coke is calcined needle coke, and the sulfur content is less than 1%, the volatile matter is less than 1%, and the ash content is less than 1%.
Further, in the step (2), the binder and the shaped raw materials are mixed according to the proportion of 1: 10-19.
Further, the binder in the step (2) is a mixture of copper powder, nano conductive carbon and asphalt, wherein the mass fraction ratio of the copper powder to the binder is 1-5%, and the mass fraction ratio of the nano conductive carbon to the binder is 0.5-1%.
Further, in the step (2), the temperature of the high-temperature reaction is 500-600 ℃, and the heat preservation time is 2-4 hours.
Further, in the step (3), the resin is phenolic resin and/or epoxy resin, and the coating proportion is 3-5%.
Further, in the step (4), the graphitization treatment is to place the coated material in an Acheson graphitization furnace for treatment.
Has the advantages that: the lithium ion battery graphite cathode material prepared by the invention has excellent low temperature and rate capability, smaller primary particles can be bonded by secondary granulation, the transmission distance of lithium ions in graphite crystals is reduced, copper powder and nano conductive carbon can be coated on the surfaces of graphite particles after a graphitization process, the charge transfer impedance on the surfaces of graphite particles is effectively reduced, the adopted resin becomes amorphous carbon after the coating and graphitization processes, the interlayer spacing of the amorphous carbon is larger than that of the graphite, and the amorphous carbon has a pore structure, so that the diffusion rate of the lithium ions is effectively accelerated.
Drawings
FIG. 1 is a scanning electron microscope picture of a graphite negative electrode material of a lithium ion battery with excellent low-temperature and rate performance in example 1;
FIG. 2 is a button cell charge-discharge diagram of the graphite negative electrode material of the lithium ion battery with excellent low-temperature and rate capability of example 1;
Detailed Description
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "front", "rear", and the like, indicate orientations or positional relationships only for the purpose of describing the present invention and simplifying the description, but do not indicate or imply that the designated device or structure must have a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention provides a graphite negative electrode material for lithium ion batteries, wherein the particle diameter D50 of 50% accumulation part from the small particle side is 7.5-8.5 μm, the particle diameter D90 of 90% accumulation part from the small particle side is 14-16 μm, and the particle diameter D100 of 100% accumulation part from the small particle side is 21-26 μm, and the BET specific surface area of the graphite negative electrode material for lithium ion batteries is 2.0-2.3 m2The tap density is 1.0-1.2 g/cm2(ii) a Wherein, the D50, the D90 and the D100 preferably have the following relations: D90/D50 is more than or equal to 1.7 and less than or equal to 1.9, and D100/D50 is more than or equal to 2.5 and less than or equal to 3.3.
The graphite cathode material of the lithium ion battery with the structure is prepared by the following steps:
(1) shaping: grinding and shaping needle coke serving as a raw material, wherein D50, D90 and D100 in the shaped raw material are respectively 3.5-5 microns, 8-10 microns and 12-20 microns;
(2) and (3) secondary granulation: mixing the shaped raw materials with a binder, putting the mixture into a reaction kettle for high-temperature reaction, and cooling to room temperature after the reaction is finished to obtain a mixture;
(3) coating: mixing the mixture obtained in the step (1) with resin for coating treatment, wherein the coating temperature is 1100-1300 ℃;
(4) graphitization: and (3) carrying out graphitization treatment on the material coated in the step (2), wherein the graphitization temperature is 3000-3200 ℃, and the heat preservation time is 10-12 h, so that the lithium ion battery graphite cathode material with excellent low temperature and rate performance can be obtained.
Further, in the step (1), the needle coke is calcined needle coke, and the sulfur content is less than 1%, the volatile matter is less than 1%, and the ash content is less than 1%.
Further, in the step (2), the binder and the shaped raw materials are mixed according to the proportion of 1: 10-19.
Further, the binder in the step (2) is a mixture of copper powder, nano conductive carbon and asphalt, wherein the mass fraction ratio of the copper powder to the binder is 1-5%, and the mass fraction ratio of the nano conductive carbon to the binder is 0.5-1%.
Further, in step (2). The temperature of the high-temperature reaction is 500-600 ℃, and the heat preservation time is 2-4 h.
Further, in the step (3), the resin is phenolic resin and/or epoxy resin, and the coating proportion is 3-5%.
Further, in the step (4), the graphitization treatment is to treat the coated material in an Acheson graphitization furnace.
Example 1
The needle coke raw material was pulverized and shaped by a pulverizer and a shaper, and the shaped particle size D50 was 3.5 μm, D90 was 8.1 μm, and D100 was 17.2 μm, and 10kg of the needle coke shaping raw material, 22g of copper powder, 10g of nano conductive carbon, and 900g of high temperature pitch were weighed. Fully and uniformly mixing the three materials, putting the mixture into a bedroom reaction kettle, heating the reaction kettle to 550 ℃, preserving heat for 3 hours, and taking out the three materials after the three materials are cooled to room temperature. And (3) taking 300g of phenolic resin, fully mixing the phenolic resin with the materials from the reaction kettle, preserving heat at 1200 ℃ for 3h for high-temperature coating, and finally preserving heat at 3000 ℃ for 12h for graphitization treatment to obtain the lithium ion battery graphite cathode material with excellent low-temperature and rate performance.
Example 2
The needle coke raw material was pulverized and shaped by a pulverizer and a shaper, and the shaped particle size D50 was 4.1 μm, D90 was 8.6 μm, and D100 was 16.8 μm, and 10kg of the needle coke shaping raw material, 50g of copper powder, 10g of nano conductive carbon, and 930g of high temperature pitch were weighed. Fully and uniformly mixing the three materials, putting the mixture into a bedroom reaction kettle, heating the reaction kettle to 550 ℃, preserving heat for 3 hours, and taking out the three materials after the three materials are cooled to room temperature. And (3) taking 280g of phenolic resin, fully mixing the phenolic resin with the material from the reaction kettle, preserving heat at 1200 ℃ for 3h for high-temperature coating, and finally preserving heat at 3000 ℃ for 12h for graphitization treatment to obtain the lithium ion battery graphite cathode material with excellent low-temperature and rate performance.
Example 3
Needle coke raw material is pulverized and shaped by a pulverizer and a shaper, the particle size D50 after shaping is 4.5 μm, D90 is 9.2 μm, and D100 is 18.5 μm, 10kg of needle coke shaping raw material, 18g of copper powder, 2.5g of nano conductive carbon and 480g of high temperature asphalt are weighed. Fully and uniformly mixing the three materials, putting the mixture into a bedroom reaction kettle, heating the reaction kettle to 550 ℃, preserving heat for 3 hours, and taking out the three materials after the three materials are cooled to room temperature. And (3) taking 450g of phenolic resin, fully mixing the phenolic resin with the materials from the reaction kettle, preserving heat at 1200 ℃ for 3h for high-temperature coating, and finally preserving heat at 3000 ℃ for 12h for graphitization treatment to obtain the lithium ion battery graphite cathode material with excellent low-temperature and rate performance.
Example 4
The needle coke raw material was pulverized and shaped by a pulverizer and a shaper, and the shaped particle size D50 was 4.9 μm, D90 was 9.6 μm, and D100 was 17.8 μm, and 10kg of the needle coke shaping raw material, 10g of copper powder, 5g of nano conductive carbon, and 980g of high temperature pitch were weighed. Fully and uniformly mixing the three materials, putting the mixture into a bedroom reaction kettle, heating the reaction kettle to 550 ℃, preserving heat for 3 hours, and taking out the three materials after the three materials are cooled to room temperature. And (3) taking 430g of phenolic resin, fully mixing the phenolic resin with the materials from the reaction kettle, preserving heat at 1200 ℃ for 3h for high-temperature coating, and finally preserving heat at 3000 ℃ for 12h for graphitization treatment to obtain the lithium ion battery graphite cathode material with excellent low-temperature and rate performance.
Example 5
Needle coke raw material was pulverized and shaped by a pulverizer and a shaper, the particle size D50 after shaping was 4.3 μm, D90 was 8.1 μm, and D100 was 17.2 μm, and 10kg of needle coke shaping raw material, 28g of copper powder, 4.5g of nano conductive carbon, and 560g of high temperature pitch were weighed. Fully and uniformly mixing the three materials, putting the mixture into a bedroom reaction kettle, heating the reaction kettle to 550 ℃, preserving heat for 3 hours, and taking out the three materials after the three materials are cooled to room temperature. And (3) taking 330g of phenolic resin, fully mixing the phenolic resin with the materials from the reaction kettle, preserving heat at 1200 ℃ for 3h for high-temperature coating, and finally preserving heat at 3000 ℃ for 12h for graphitization treatment to obtain the lithium ion battery graphite cathode material with excellent low-temperature and rate performance.
The properties of the materials prepared in examples 1-5 and the effects of the first discharge and first coulomb on the batteries were examined, with the specific parameters as given in table 1 below.
TABLE 1
As can be seen from table 1, the graphite anode material of the present invention has excellent first discharge capacity and first coulombic efficiency within the defined structural range.
Next, the charging constant current ratio test was performed on example 1 at different rates, and the specific data are shown in table 2 below.
TABLE 2
Finally, the percentage of discharge capacity of example 1 at different temperatures was measured and the specific data is shown in table 3 below.
TABLE 3
| 25℃ | 10℃ | 0℃ | -10℃ | -20℃ | -30℃ | |
| Example 1 | 100％ | 97.26％ | 95.38％ | 89.35％ | 86.35％ | 78.35％ |
As can be seen from the data in tables 2 and 3, the graphite anode material prepared in this example 1 has excellent charging performance at different rates, and maintains excellent discharge performance at low temperatures.
In order to make the objects, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the above specific embodiments, which are only used for describing the present invention, and should not be construed as limiting the scope of the present invention. It should be understood that any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A graphite negative electrode material for lithium ion batteries, characterized in that the particle diameter D50 of 50% cumulative part from the small particle side is 7.5 to 8.5 μm, the particle diameter D90 of 90% cumulative part from the small particle side is 14 to 16 μm, and the particle diameter D100 of 100% cumulative part from the small particle side is 21 to 26 μm, and the BET specific surface area of the graphite negative electrode material for lithium ion batteries is 2.0 to 2.3m2The tap density is 1.0-1.2 g/cm2。
2. The graphite negative electrode material for the lithium ion battery as claimed in claim 1, wherein the relationships among D50, D90 and D100 are preferably as follows: D90/D50 is more than or equal to 1.7 and less than or equal to 1.9, and D100/D50 is more than or equal to 2.5 and less than or equal to 3.3.
3. The preparation method of the graphite anode material of the lithium ion battery according to the claims 1-2, which is characterized by comprising the following steps,
(1) shaping: grinding and shaping needle coke serving as a raw material, wherein D50, D90 and D100 in the shaped raw material are respectively 3.5-5 microns, 8-10 microns and 16-20 microns;
(2) and (3) secondary granulation: mixing the shaped raw materials with a binder, putting the mixture into a reaction kettle for high-temperature reaction, and cooling to room temperature after the reaction is finished to obtain a mixture;
(3) coating: mixing the mixture obtained in the step (1) with resin for coating treatment, wherein the coating temperature is 1100-1300 ℃;
(4) graphitization: and (3) carrying out graphitization treatment on the material coated in the step (2), wherein the graphitization temperature is 3000-3200 ℃, and the heat preservation time is 10-12 h, so that the lithium ion battery graphite cathode material with excellent low temperature and rate performance can be obtained.
4. The method for preparing the graphite anode material of the lithium ion battery as claimed in claim 3, wherein in the step (1), the needle coke is calcined needle coke, and has a sulfur content of less than 1%, a volatile content of less than 1% and an ash content of less than 1%.
5. The preparation method of the graphite anode material for the lithium ion battery as claimed in claim 3, wherein in the step (2), the binder and the shaped raw materials are mixed according to a ratio of 1: 10-19.
6. The preparation method of the graphite negative electrode material of the lithium ion battery as claimed in claim 3 or 5, wherein the binder in the step (2) is a mixture of copper powder, nano conductive carbon and asphalt, wherein the mass fraction ratio of the copper powder to the binder is 1-5%, and the mass fraction ratio of the nano conductive carbon to the binder is 0.5-1%.
7. The preparation method of the graphite anode material for the lithium ion battery according to claim 3, wherein in the step (2), the temperature of the high-temperature reaction is 500-600 ℃, and the heat preservation time is 2-4 hours.
8. The preparation method of the graphite anode material for the lithium ion battery according to claim 3, wherein in the step (3), the resin is phenolic resin and/or epoxy resin, and the coating proportion is 3-5%.
9. The preparation method of the graphite anode material of the lithium ion battery as claimed in claim 3, wherein in the step (4), the graphitization treatment is to treat the coated material in an Acheson graphitization furnace.
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| WO2023012296A1 (en) * | 2021-08-04 | 2023-02-09 | Sgl Carbon Se | Anode material |
| CN115706230A (en) * | 2022-12-28 | 2023-02-17 | 中创新航科技股份有限公司 | Composite graphite negative electrode material, negative plate and lithium ion battery |
| US12218354B2 (en) | 2020-10-15 | 2025-02-04 | Contemporary Amperex Technology (Hong Kong) Limited | Negative-electrode active material and preparation method thereof, secondary battery, and battery module, battery pack, and apparatus containing such secondary battery |
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