CN114538431A - Quick-charging graphite negative electrode material for lithium battery and preparation method thereof - Google Patents
Quick-charging graphite negative electrode material for lithium battery and preparation method thereof Download PDFInfo
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- CN114538431A CN114538431A CN202111055430.XA CN202111055430A CN114538431A CN 114538431 A CN114538431 A CN 114538431A CN 202111055430 A CN202111055430 A CN 202111055430A CN 114538431 A CN114538431 A CN 114538431A
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- 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
- C01B32/20—Graphite
- C01B32/205—Preparation
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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
- H01M4/36—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
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to the technical field of lithium ion battery materials, and discloses a quick-charging graphite negative electrode material for a lithium battery and a preparation method thereof. Aiming at the problem that the quick charge performance of the negative electrode material in the prior art still has a room for improvement, the preparation method of the quick charge graphite negative electrode material for the lithium battery is provided, and comprises the following steps: crushing a coke precursor to obtain primary single particles with the particle size of 1-3 mu m; step two, mixing the primary single particles with resin, transferring the mixture to an inert atmosphere for granulation to obtain secondary particles with the particle size of 8-18 mu m; step three, carrying out graphitization treatment on the secondary particles to obtain graphitized secondary particles; coating the graphitized secondary particles with a carbon source to obtain coated particles; step five, calcining the coated particles in an inert atmosphere, and naturally cooling to room temperature to prepare the quick-charging graphite cathode material coated with the amorphous carbon layer, wherein the final particles are 18-32 mu m; the prepared quick-charging graphite cathode material can improve the quick-charging and low-temperature performance of the prepared lithium battery.
Description
Technical Field
The invention relates to the technical field of lithium ion battery materials, in particular to a quick-charging graphite negative electrode material for a lithium battery and a preparation method thereof.
Background
The lithium ion battery has wide market demand due to the advantages of high safety, high energy density and the like, and particularly has great market value in the application of power automobiles, but the power automobiles have higher requirements on the charging speed of the lithium battery, the negative electrode material is one of key factors restricting the quick charging and low-temperature performance of the lithium battery, and the method for improving the quick charging capacity of the graphite can be mainly achieved by improving the transmission of ions in a solid phase, such as: increase the ion transmission direction, widen the ion transmission channel, shorten the ion transmission path, and the like.
Chinese patent CN112582592A discloses a high-compaction and fast-filling artificial graphite material and a preparation method thereof, wherein a hot liquid phase and a dynamic coating are adopted to coat the surface of the artificial graphite with a uniform amorphous carbon layer, so that the multiplying power charge and discharge, low temperature and cycle performance of the material are improved; however, the rapid charging performance is improved by the coating method, but the selection and the granulation degree of the coating agent can still influence the rapid charging performance of the negative electrode material, so that the rapid charging performance still has a great space for improving.
Disclosure of Invention
Aiming at the problem that the quick charge performance of the negative electrode material in the prior art still has a room for improvement, the invention provides the preparation method of the quick charge graphite negative electrode material for the lithium battery, which improves the preparation scheme more fully and improves the quick charge performance of the lithium battery made of the negative electrode material; the quick-charging graphite cathode material for the lithium battery is provided, and the quick-charging performance of the manufactured lithium battery can be effectively improved by the cathode material.
The invention is realized by the following scheme:
a preparation method of a quick-charging graphite negative electrode material for a lithium battery comprises the following steps:
step one, crushing: crushing the coke precursor to obtain primary single particles with the particle size of 1-3 mu m;
step two, granulation: mixing the primary single particles with resin, transferring the mixture to inert atmosphere for granulation to obtain secondary particles with the particle size of 6-16 mu m;
step three, graphitizing: carrying out graphitization treatment on the secondary particles to obtain graphitized secondary particles;
step four, coating: coating the graphitized secondary particles with a carbon source to obtain coated particles;
step five, carbonization: calcining the coated particles in an inert atmosphere, and naturally cooling to room temperature to obtain the fast-charging graphite cathode material coated with the amorphous carbon layer, wherein the final particles are 8-18 mu m.
The structure of the fast-charging graphite cathode material is primary single particles from inside to outside, the primary single particles are adhered together by a resin hard carbon layer, and an amorphous carbon layer is coated on the outermost layer; the primary single particle has the particle size of 1-3 microns, the particle size is fine, the ion transmission path is short, the secondary particle has the particle size of 6-16 microns, the granulation degree is large, the material orientation is good, and the final particle size is 8-18 microns, so that the distances between the hard carbon structure inside the secondary particle and the carbon layer of the coated amorphous carbon structure are large, the lithium ion transmission is facilitated, and the fast charging and low temperature performance of the material can be improved.
Preferably, the coke precursor in the step one is one or a mixture of petroleum coke, asphalt mastic, needle coke and isotropic coke.
Preferably, the coke precursor in the first step is an isotropic coke, which facilitates the transportation of lithium ions to various directions through the isotropic coke.
Preferably, when the temperature of the resin in the second step is higher than 350 ℃, the viscosity of the resin is more than or equal to 800mpa.s, the carbon residue rate is more than or equal to 15 percent, and the carbon residue rate is the carbon content remained after the resin is calcined to remove all organic impurities; the mass ratio of the resin to the primary single particles is 2: 100-12: 100, mixing in a mixer, wherein the granulation process is to heat up to 350-600 ℃ at the speed of 5-10 ℃/min and preserve heat for 1-3 h; the inert atmosphere is one of nitrogen and argon; the rapid temperature rise promotes the viscosity increase and the disorder degree increase of the resin, the resin with high viscosity and disorder degree can promote the adhesion of primary single particles together to form secondary particles with larger particles, the granulation temperature is high so as to fully remove organic impurities in the resin, fully harden the resin, form a thicker hard carbon structure and be beneficial to the transmission of lithium ions.
Preferably, the resin in the second step is one of phenolic resin, condensed polycyclic aromatic hydrocarbon resin, high molecular polyol modified epoxy resin, polyurethane modified epoxy resin, high molecular polyol modified epoxy acrylate resin, polyurethane modified epoxy acrylate resin and furan resin, and most of the resins have the viscosity of more than or equal to 800mpa.s and the carbon residue rate of more than or equal to 15% at the temperature of more than 350 ℃, except the resins which are specially treated.
Preferably, the temperature of the graphitization treatment in the third step is 2800-3300 ℃, the graphitization time is 20-60h, and the graphitization high-temperature treatment graphitizes the secondary particles and further removes organic impurities in the hard carbon structure.
Preferably, the carbon source in the fourth step is one or a mixture of more of asphalt, asphalt resin, resin tar, phenolic resin, condensed polycyclic aromatic hydrocarbon resin, high molecular polyol modified epoxy resin, polyurethane modified epoxy resin, high molecular polyol modified epoxy acrylate resin, polyurethane modified epoxy acrylate resin and furan resin, and the carbon residue of the materials is mostly greater than or equal to 15% except that the materials are treated specially.
The coating method in the fourth step is one of liquid phase coating and solid phase coating, wherein the liquid phase coating means that a carbon source is uniformly dispersed in a solvent and then uniformly sprayed on the surfaces of the graphitized secondary particles through liquid phase coating equipment; the solid phase coating means that the graphitized secondary particles are uniformly mixed with a carbon source.
Preferably, the mass of the carbon source is 1.5% to 8% of the graphitized secondary particles.
Preferably, the temperature of the calcination in the fifth step is increased to 800-1100 ℃ at the speed of 3-10 ℃/min, and then the temperature is maintained for 1-3h, in the process, organic impurities of the coating layer of the graphitized secondary particles are removed, an amorphous carbon layer is formed, and the amorphous carbon layer with large thickness is beneficial to promoting the transmission of lithium ions.
The invention has the advantages that (1) the primary single particle with small particle size is adopted, the lithium ion transmission path is shortened, and particularly the selection of the isotropic coke is beneficial to transmitting the lithium ions to all directions; (2) the method comprises the following steps of carrying out rapid heating and high-temperature granulation, preparing hard carbon coating primary single particles by using resin with high viscosity, high disorder degree and high carbon residue rate to obtain graphitized secondary particles with larger particles, wherein the resin hard carbon is uniformly distributed among artificial graphite of the secondary particles, and the carbon layer interval is large, so that lithium ions can be transmitted; thereby the quick-charging and low-temperature performance of the material is effectively improved.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments, but the embodiments are only the preferred embodiments of the invention, and not all; based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention; the experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the average particle size of 2.2 mu m and phenolic resin with the viscosity of 1600mpa.s carbon residue rate of 60% according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 10 ℃/min, and preserving the heat for 3h to obtain secondary particles;
step three, graphitizing: carrying out graphitization treatment on the secondary particles at 3300 ℃ and preserving heat for 60 hours to obtain graphitized secondary particles;
step four, coating: coating the graphitized secondary particles with asphalt with a carbon residue rate of 60% in a mass ratio of 27:2 to obtain coated particles;
step five, carbonization: heating the coated particles to 1100 ℃ at a heating rate of 10 ℃/min under a nitrogen atmosphere of a box furnace, calcining, keeping the temperature for 3h, and naturally cooling to room temperature to obtain the rapid-charging graphite cathode material coated with the amorphous carbon layer.
Example 2:
step one, crushing: crushing a certain amount of petroleum coke to obtain primary single particles;
the second to fifth steps were the same as those of example 1.
Example 3:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the average particle size of 2.6 mu m and phenolic resin with the viscosity of 1600mpa.s carbon residue rate of 60 percent according to the mass ratio of 98:2, transferring the mixture into nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 10 ℃/min, and preserving the heat for 3 hours to obtain secondary particles;
the procedure of example 1 was repeated for three to five steps.
Example 4:
the first to third steps are the same as the first to third steps of example 1;
step four, coating: coating the graphitized secondary particles with asphalt with a carbon residue rate of 60% in a mass ratio of 200:3 to obtain coated particles;
step five, carbonization: same as example 1, step five.
Example 5:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the average particle size of 1.6 mu m and phenolic resin with the viscosity of 1600mpa.s carbon residue rate of 60% according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 350 ℃ at the speed of 5 ℃/min, and preserving the heat for 1h to obtain secondary particles;
the procedure of example 1 was repeated to obtain the third to fifth steps.
Example 6:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the average particle size of 1.5 mu m and phenolic resin with the viscosity of 1600mpa.s carbon residue rate of 60% according to the mass ratio of 98:2, transferring the mixture into nitrogen atmosphere, heating the mixture to 350 ℃ at the speed of 5 ℃/min, and preserving the heat for 1h to obtain secondary particles;
step three, graphitizing: graphitizing the secondary particles at 2800 ℃ and preserving heat for 20 hours to obtain graphitized secondary particles;
step four, coating: coating the graphitized secondary particles with asphalt with the carbon residue of 60% in a mass ratio of 200:3 to obtain coated particles;
step five, carbonization: heating the coated particles to 800 ℃ at the heating rate of 3 ℃/min under the nitrogen atmosphere of a box furnace, calcining, keeping the temperature for 1h, and naturally cooling to room temperature to obtain the rapid-charging graphite cathode material coated with the amorphous carbon layer.
Example 7:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the average particle size of 1.5 mu m and phenolic resin with the viscosity of 1600mpa.s carbon residue rate of 60% according to the mass ratio of 29:1, transferring the mixture into nitrogen atmosphere, heating the mixture to 475 ℃ at the speed of 7.5 ℃/min, and preserving the heat for 2h to obtain secondary particles;
step three, graphitizing: graphitizing the secondary particles at 3050 ℃ and preserving heat for 40 hours to obtain graphitized secondary particles;
step four, coating: coating the graphitized secondary particles with asphalt with a carbon residue rate of 60% in a mass ratio of 40.08:1 to obtain coated particles;
step five, carbonization: heating the coated particles to 950 ℃ at the heating rate of 6.5 ℃/min under the nitrogen atmosphere of a box furnace, calcining, preserving heat for 2 hours, and naturally cooling to room temperature to obtain the rapid graphite charging cathode material coated with the amorphous carbon layer.
Example 8:
step one, crushing: crushing a certain amount of petroleum coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the average particle size of 2.3 mu m and phenolic resin with the viscosity of 1600mpa.s and the carbon residue rate of 60 percent according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 5 ℃/min, and preserving the heat for 2 hours to obtain secondary particles;
step three, graphitizing: carrying out graphitization treatment on the secondary particles at 3300 ℃ and preserving heat for 20h to obtain graphitized secondary particles;
step four, coating: coating the graphitized secondary particles with asphalt resin with a carbon residue rate of 50% in a mass ratio of 40.08:1 to obtain coated particles;
step five, carbonization: heating the coated particles to 1100 ℃ at a heating rate of 10 ℃/min under nitrogen atmosphere in a box furnace, calcining, keeping the temperature for 3 hours, and naturally cooling to room temperature to obtain the rapid graphite charging cathode material coated with the amorphous carbon layer.
Comparative example 1:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles of 2.0 mu m and phenolic resin with viscosity capable of reaching 1600mpa.s carbon residue rate of 60% according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 1 ℃/min, and preserving heat for 3h to obtain secondary particles;
the third to fifth steps are the same as the third to fifth steps in example 1.
Comparative example 2:
step two, granulation: mixing primary single particles of 2.0 mu m and phenolic resin with viscosity capable of reaching 1600mpa.s carbon residue rate of 60% according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 80 ℃ at the speed of 1 ℃/min, and preserving heat for 3h to obtain secondary particles;
the first step, the third step and the fifth step are the same as the first step, the third step and the fifth step of the embodiment 1.
Comparative example 3:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the average particle size of 6.8 mu m and phenolic resin with the viscosity of 1600mpa.s carbon residue rate of 60% according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 10 ℃/min, and preserving the heat for 3h to obtain secondary particles;
the third to fifth steps are the same as the third to fifth steps in example 1.
Comparative example 4:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the particle size of 2.0 mu m and phenolic resin with the viscosity of only 500mpa.s according to the mass ratio of 90:10, transferring the mixture into a nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 10 ℃/min, and preserving the heat for 3h to obtain secondary particles;
the third to fifth steps are the same as the third to fifth steps in example 1.
Comparative example 5:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the particle size of 1.9 mu m and rosin resin with the viscosity of 1000mpa.s and the carbon residue rate of 10 percent according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 10 ℃/min, and preserving the heat for 3 hours to obtain secondary particles;
the third to fifth steps are the same as the third to fifth steps in example 1.
Comparative example 6:
step one, crushing: crushing a certain amount of isotropic coke to obtain primary single particles;
step two, granulation: mixing primary single particles with the particle size of 1.6 mu m and paratoluenesulfonic acid catalytic modified asphalt with the viscosity of only 600mpa.s and the carbon residue rate of 40 percent according to the mass ratio of 90:10, transferring the mixture into nitrogen atmosphere, heating the mixture to 600 ℃ at the speed of 10 ℃/min, and preserving the heat for 3 hours to obtain secondary particles;
the third to fifth steps are the same as the third to fifth steps in example 1.
Comparative example 7:
the first step, the third step and the fifth step are the same as the first step, the third step and the fifth step in the embodiment 1;
step four, coating: and coating the graphitized secondary particles with rosin resin with a carbon residue rate of 10% in a mass ratio of 27:2 to obtain coated particles.
Performance testing of the materials prepared in the above examples:
and (3) particle size testing: detecting the primary single particle size distribution peak value and the final particle size distribution peak value;
preparing a negative pole piece by using the quick-charging graphite material prepared in the embodiment, and assembling a button cell to perform electrochemical performance test: mixing the quick-filling graphite material obtained in the embodiment with conductive carbon black, sodium carboxymethylcellulose (CMC) and Styrene Butadiene Rubber (SBR) according to the mass ratio of 90:5:2:3, adding deionized water and stirring uniformly; coating the slurry on a copper foil, carrying out vacuum drying for 24 hours at 90 ℃, then carrying out rolling, and finally preparing a pole piece with the diameter of 14 mm; assembling a 2025 button cell with the specification by taking metal lithium as a counter electrode, wherein a diaphragm is a polypropylene film (Celgard 2300), an electrolyte is a mixed solution of 1mol/L lithium hexafluorophosphate dissolved in vinyl carbonate and dimethyl carbonate in an equal volume ratio, and the assembling process is carried out in vacuum; and during electrochemical performance test, performing constant-current and constant-voltage capacity test at a multiplying power of 0.1C, performing constant-current charging at currents of 2C and 3C respectively until the SOC is cut off to 100%, and analyzing a quick lithium extraction point of the material through a dV/dQ curve, wherein the voltage range is 0-1.5V.
Table 1: testing the peak value of the particle size distribution:
table 2: electrochemical performance testing of assembled batteries:
the data in tables 1-2 can be used, the data of SOC of the embodiment 1 is better than that of the embodiment 2 when the embodiment 1 adopts isotropic coke and the conditions are the same as those of the embodiment 2 adopting petroleum coke, so that the influence of the isotropic coke on the quick charging and the multiplying power is better than that of the petroleum coke, and meanwhile, the embodiment 1 is also the best electrochemical performance in the embodiments; examples 3 and 4 both used lower resin and pitch ratios than example 1, with SOC significantly lower than example 1; in the granulation processes of examples 5 and 6, the temperature rise speed is low, the temperature is relatively low, the heat preservation time is short, the impurity removal process is not as sufficient as that of example 1, the viscosity and the disorder degree of the resin are not improved sufficiently, and therefore, the SOC is lower than that of examples 1, 3 and 4; comparative example 1 the temperature rise rate in the granulation process is lower than the claimed protection range, the impurity removal time is insufficient, the particle size is not affected, but the SOC is lower than that of each example; comparative example 2 the temperature rise speed is the same as that of comparative example 1, but the heat preservation temperature is far lower than the protection range of the claims, the particle size of secondary particles is seriously reduced, and the first circulation reversible capacity and the SOC are both remarkably reduced; comparative example 3 the primary single particle size is large, so the inter-particle dispersion degree is not high enough, the lithium ion transmission path is improved, and the SOC is reduced; comparative examples 5 and 6 in the granulation process, a high viscosity low carbon residue resin which causes a thin hard carbon layer of the resin to be formed, which is not advantageous for lithium ion transport, and which is poor in resistance increase and rapid charge, and a low viscosity high carbon residue resin which is poor in adhesion to the primary single particle, small in granulation degree, small in secondary particle size, thin in resin hard carbon layer, which is not advantageous for lithium ion transport, and which is poor in resistance increase and rapid charge, are used, respectively, and thus the first cycle reversible capacity and SOC are lower than those of the respective examples, and comparative example 4 is similar to comparative example 6; comparative example 7 adopts rosin resin coated graphitized secondary particles with low carbon residue rate, the thickness of an amorphous carbon layer in the final particles is reduced, the first-cycle reversible capacity and SOC are reduced to some extent compared with the examples, but the ratio is slightly higher than comparative examples 3-5.
Claims (10)
1. A preparation method of a quick-charging graphite negative electrode material for a lithium battery is characterized by comprising the following steps:
step one, crushing: crushing the coke precursor to obtain primary single particles with the particle size of 1-3 mu m;
step two, granulation: mixing the primary single particles with resin, transferring the mixture to inert atmosphere for granulation to obtain secondary particles with the particle size of 6-16 mu m;
step three, graphitizing: carrying out graphitization treatment on the secondary particles to obtain graphitized secondary particles;
step four, coating: coating the graphitized secondary particles with a carbon source to obtain coated particles;
step five, carbonization: calcining the coated particles in an inert atmosphere, and naturally cooling to room temperature to obtain the fast-charging graphite cathode material coated with the amorphous carbon layer, wherein the particle size is 8-18 mu m.
2. The method for preparing the quick-charging graphite negative electrode material for the lithium battery as claimed in claim 1, wherein the coke precursor in the step one is one or a mixture of petroleum coke, asphalt mastic, needle coke and isotropic coke.
3. The method for preparing the quick-charging graphite negative electrode material for the lithium battery as claimed in claim 1 or 2, wherein the coke precursor in the step one is isotropic coke.
4. The method for preparing the negative electrode material of quick-charging graphite for the lithium battery as claimed in claim 1, wherein the viscosity of the resin in the second step is greater than or equal to 800mpa.s and the carbon residue rate is greater than or equal to 15% at the temperature of more than 350 ℃; mixing the resin and the primary single particles in a mixer according to a mass ratio of 2-12: 100; the granulation process is to heat up to 350-; the inert atmosphere is one of nitrogen and argon.
5. The method for preparing the quick-charging graphite negative electrode material for the lithium battery as claimed in claim 4, wherein the resin is one of phenolic resin, condensed polycyclic aromatic hydrocarbon resin, high-molecular polyol modified epoxy resin, polyurethane modified epoxy resin, carbon fiber/epoxy resin composite material, high-molecular polyol modified epoxy acrylate resin, polyurethane modified epoxy acrylate resin and furan resin.
6. The method for preparing a quick-charging graphite cathode material for a lithium battery as claimed in claim 1, wherein the temperature of the graphitization treatment in the step three is 2800 ℃ and 3300 ℃, and the graphitization time is 20-60 h.
7. The method for preparing a quick-charging graphite anode material for a lithium battery as claimed in claim 1, wherein the carbon source has a carbon residue rate of 15% or more in the fourth step.
8. The method for preparing the quick-charging graphite negative electrode material for the lithium battery as claimed in claim 7, wherein the carbon source is one or more of asphalt, pitch resin, resin tar, phenolic resin, condensed polycyclic aromatic hydrocarbon resin, high-molecular polyol modified epoxy resin, polyurethane modified epoxy resin, carbon fiber/epoxy resin composite material, high-molecular polyol modified epoxy acrylate resin, polyurethane modified epoxy acrylate resin and furan resin.
9. The method for preparing a quick-charging graphite anode material for a lithium battery as claimed in claim 1, 7 or 8, wherein the mass of the carbon source is 1.5-8% of the mass of the graphitized secondary particles.
10. The preparation method of the quick-charging graphite negative electrode material for the lithium battery as claimed in claim 1, wherein the high-temperature calcination in the fifth step is carried out by heating to 800-1100 ℃ at a speed of 3-10 ℃/min and then keeping the temperature for 1-3 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115448305A (en) * | 2022-09-19 | 2022-12-09 | 惠州锂威新能源科技有限公司 | Graphite matrix and preparation method thereof, and quick-charging graphite and preparation method thereof |
| CN115520860A (en) * | 2022-09-27 | 2022-12-27 | 大理宸宇储能新材料有限公司 | High-sulfur Jiao Gaixing and method for preparing quick-charging graphite anode material and application thereof |
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| CN115520860A (en) * | 2022-09-27 | 2022-12-27 | 大理宸宇储能新材料有限公司 | High-sulfur Jiao Gaixing and method for preparing quick-charging graphite anode material and application thereof |
| CN115520860B (en) * | 2022-09-27 | 2024-01-23 | 大理宸宇储能新材料有限公司 | High-sulfur Jiao Gaixing and method for preparing quick-charge graphite anode material and application thereof |
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