CN112054198A - Negative active material, preparation method and application thereof - Google Patents

Negative active material, preparation method and application thereof Download PDF

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Publication number
CN112054198A
CN112054198A CN202010900474.7A CN202010900474A CN112054198A CN 112054198 A CN112054198 A CN 112054198A CN 202010900474 A CN202010900474 A CN 202010900474A CN 112054198 A CN112054198 A CN 112054198A
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particles
active material
carbon
negative electrode
metal layer
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何欢
齐士博
吕豪杰
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Kunshan Bao Innovative Energy Technology Co Ltd
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Kunshan Bao Innovative Energy Technology Co Ltd
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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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/46—Alloys based on magnesium or aluminium
    • H01M4/466—Magnesium based
    • 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
    • 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
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • 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
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a negative active material for a lithium battery, and a preparation method and application thereof. The negative active material includes: first particles, second particles, and a carbon material; wherein the median particle size of the first particles is greater than the median particle size of the second particles; the first particle comprises a first body and a first carbon coating layer coated on at least part of the surface of the first body; the second particles comprise a second body, an active metal layer coated on at least part of the surface of the second body, and a second carbon coating layer coated on at least part of the surface of the active metal layer far away from the second body. The negative active material is prepared by mixing large and small particles and filling a carbon material, so that the compaction density of the material can be effectively improved, the rebound of the material after full charge is reduced, and the cycle performance of the material is improved.

Description

Negative active material, preparation method and application thereof
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a negative active material for a lithium battery, and a preparation method and application thereof.
Background
The silicon protoxide material is used as an alloying type negative electrode material, the theoretical specific capacity of the silicon protoxide material is larger than 2000 mA.h/g, the lithium potential of the silicon protoxide material is lower (<0.5V), and the voltage platform is slightly higher than that of graphite. In the process of commercial application, the silicon oxide negative electrode material still has the following problems. Firstly, the silicon monoxide belongs to a semiconductor material, and has low conductivity, is not beneficial to electron transmission, and has poor rate performance in a battery. And secondly, the particle pulverization failure caused by the huge volume change of the silicon monoxide negative electrode material in the lithium removal/insertion process is caused, the volume expansion exceeds 300 percent, the negative electrode material is separated from a current collector, the capacity is rapidly reduced, and the cycle performance of the battery is greatly reduced. In addition, the volume expansion can lead the silicon monoxide negative electrode material to form a stable SEI film in the electrolyte to be broken, a new active surface is exposed, and a new SEI film is formed on the surface of the newly exposed material, so that a series of problems of electrolyte consumption, material corrosion and the like are aggravated, the capacity of the battery is reduced, and the cycle performance is poor.
It follows that how to reduce the volume effect and lower conductivity of the siliconoxide negative electrode during cycling is crucial to improve the electrochemical performance of the siliconoxide negative electrode.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present invention is to propose a negative active material for a lithium battery, a method for preparing the same, and applications thereof. The negative active material is prepared by mixing large and small particles and filling a carbon material, so that the compaction density of the material can be effectively improved, the rebound of the material after full charge is reduced, and the cycle performance of the material is improved.
In one aspect of the present invention, a negative active material is provided. According to an embodiment of the present invention, the anode active material includes: first particles, second particles, and a carbon material; wherein the median particle size of the first particles is greater than the median particle size of the second particles; the first particle comprises a first body and a first carbon coating layer coated on at least part of the surface of the first body; the second particles comprise a second body, an active metal layer coated on at least part of the surface of the second body, and a second carbon coating layer coated on at least part of the surface of the active metal layer far away from the second body.
In the negative active material according to the above-described embodiment of the present invention, the median particle diameter of the first particles is larger than that of the second particles, and thus the second particles having a smaller particle diameter can fill the spaces between the first particles having a larger particle diameter, thereby improving compaction of the material, and the voids between the particles can be maximally utilized when the material is charged, buffering the expansion stress of the material, and at the same time, the adhesion of the binder to the material particles is improved due to the presence of the small particles of silica, and the spring back of the material after cold pressing can be improved. Meanwhile, the carbon material can also be filled in the space between the first particles, so that the connectivity between the large particles and the large particles is further improved, the breakage of a transfer network in circulation is effectively inhibited, and the circulation performance of the material is further improved. On the other hand, the presence of the carbon coating layer in the first particle, the active metal layer in the second particle, and the carbon coating layer can further increase the first coulombic efficiency of the material and help suppress the material expansion. In conclusion, the negative active material of the invention can effectively improve the compaction density of the material, reduce the rebound of the material after full charge and improve the cycle performance of the material by adopting the mixing of the large and small particles and the filling of the carbon material.
In addition, the anode active material according to the above embodiment of the present invention may also have the following additional technical features:
in some embodiments of the present invention, the first body and the second body are each independently at least one selected from the group consisting of silica particles, silicon carbon particles.
In some embodiments of the present invention, the first particles have a median particle size of 5 to 7 μm, and the second particles have a median particle size of 1 to 3 μm.
In some embodiments of the invention, the active metal layer comprises at least one of a lithium-containing compound, magnesium.
In some embodiments of the invention, the carbon material is selected from at least one of carbon fiber, graphene, carbon nanotubes.
In some embodiments of the present invention, the mass ratio of the first particles, the second particles, and the carbon material is (12-48): 4-5): 5-6.
In some embodiments of the invention, the negative electrode material further comprises: the content of the graphite particles accounts for 80-95% of the total mass of the negative electrode active material.
In some embodiments of the present invention, the graphite particles have a median particle size of 15 to 20 μm.
In another aspect of the present invention, the present invention proposes a method of preparing the anode active material of the above embodiment. According to an embodiment of the invention, the method comprises: providing a first body and a second body; forming a first carbon coating layer on at least part of the surface of the first body to obtain first particles; forming an active metal layer on at least part of the surface of the second body, and forming a second carbon coating layer on at least part of the surface of the active metal layer far away from the second body to obtain second particles; mixing the second particles with a carbon material and a solvent to obtain a slurry; and removing the solvent from the slurry, and mixing the slurry with the first particles to obtain the negative electrode active material. Therefore, the method is simple, convenient and efficient, the cost is low, and the prepared negative active material can effectively improve the compaction density of the material, reduce the rebound of the material after full charge and improve the cycle performance of the material by adopting the mixing of large and small particles and the filling of a carbon material.
In addition, the method of preparing the anode active material according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the method further comprises: graphite particles are added to the negative active material.
In yet another aspect of the present invention, a lithium ion battery is presented. According to an embodiment of the present invention, the lithium ion battery includes: the anode active material of the above example, or the anode active material prepared by the method of the above example. Thus, the lithium ion battery has all the features and advantages described above for the negative active material, and thus, the description thereof is omitted. In general, the lithium ion battery has excellent cycle performance, compaction density and other properties.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of an anode active material according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an anode active material according to still another embodiment of the present invention.
Reference numerals:
1-first particles, 2-first carbon coating layer, 3-second particles, 4-active metal layer and second carbon coating layer, 5-carbon material, 6-graphite particles.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In one aspect of the present invention, a negative active material is provided. According to an embodiment of the present invention, the anode active material includes: first particles, second particles, and a carbon material; wherein the median particle size of the first particles is greater than the median particle size of the second particles; the first particle comprises a first body and a first carbon coating layer coated on at least part of the surface of the first body; the second particle comprises a second body, an active metal layer coated on at least part of the surface of the second body, and a second carbon coating layer coated on at least part of the surface of the active metal layer far away from the second body.
The anode active material according to the embodiment of the present invention is further described in detail below.
In the anode material of the present invention, the first/second bodies in the first/second particles may be a silicon-based anode material commonly used in the art. For example, according to some embodiments of the present invention, the first body and the second body may each independently be at least one selected from silicon oxygen particles, silicon carbon particles, or other silicon-based oxides.
According to some embodiments of the invention, the median particle diameter (D) of the first particles is50) May be 5 to 7 μm, for example, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, etc.; median diameter (D) of the second particles50) May be 1 to 3 μm, for example, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, etc. By controlling the particle sizes of the first particles and the second particles within the above range, the difference between the particle sizes of the first particles and the second particles is appropriate, and the second particles and the carbon material can be better filled in the gaps between the first particles, thereby achieving the effects of improving material compaction and improving material cycle performance. The inventors have found that if the particle sizes of the first particles and the second particles are outside the above range, the cycle performance and capacity of the material may be adversely affected, while resulting in a material whose full-charge expansion ratio is not improved very well.
According to some embodiments of the present invention, the active metal layer of the second particle may include at least one of a lithium-containing compound, magnesium. For example, the active metal layer may include LiH and Mg. The first coulomb efficiency of the material can thereby be further increased.
According to some embodiments of the present invention, the carbon material may be at least one selected from carbon fiber, graphene, and carbon nanotube. By filling the gaps among the first particles with the carbon material, the connectivity among large particles and large particles can be further improved, so that the breakage of a transfer network in circulation is effectively inhibited, and the circulation performance of the material is further improved.
According to some embodiments of the present invention, the mass ratio of the first particles, the second particles and the carbon material is (12-48): 4-5): 5-6. Specifically, the mass fraction of the first particles may be 12, 15, 20, 24, 28, 30, 32, 36, 40, 44, 48, etc., the mass fraction of the second particles may be 4, 4.5, 5, etc., and the mass fraction of the third particles may be 5, 5.5, 6, etc. By controlling the mass ratio of the first particles, the second particles, and the carbon material within the above range, the filling of the voids between the first particles by the second particles and the carbon material can be further facilitated. The inventors have found that if the amount of the first particles is too high, it may result in a material with a less than good full-charge expansion rate, and if the amount of the first particles is too low, the material cycle performance is reduced; if the amount of the second particles is too high, it may result in a reduction in the overall compaction of the material, and if it is too low, it may result in a less than good improvement in the full swelling rate of the material; if the amount of the carbon material is too high, the full charge expansion rate of the material may not be improved well, and if the amount of the carbon material is too low, the overall capacity of the material may be reduced and the cycle performance may be reduced.
According to some embodiments of the invention, the negative active material further comprises: graphite particles. The content of the graphite particles accounts for 80-95% of the total mass of the negative active material. The inventors have found that by doping the above-mentioned negative electrode active material with the graphite particles in the above-mentioned amount, the cycle performance of the material can be further improved, and the problem of the full charge rebound of the material can be improved.
According to some embodiments of the present invention, the median particle diameter of the graphite particles may be 15 to 20 μm, for example, 15 μm, 16 μm, 18 μm, 20 μm, and the like. Therefore, the cycle performance of the material can be further improved, and the problem of full charge rebound of the material can be improved.
In another aspect of the present invention, the present invention proposes a method of preparing the anode active material of the above embodiment. According to an embodiment of the invention, the method comprises:
firstly, providing a first body and a second body; forming a first carbon coating layer on at least part of the surface of the first body to obtain first particles; and forming an active metal layer on at least part of the surface of the second body, and forming a second carbon coating layer on at least part of the surface of the active metal layer far away from the second body to obtain second particles.
According to some embodiments of the present invention, the first carbon coating layer and the second carbon coating layer may be formed as an amorphous carbon coating layer through a vapor deposition reaction, and the active metal layer may be formed through a thermal alloy method or a homogeneous vapor reaction.
Further, the second particles are mixed with a carbon material and a solvent to obtain a slurry.
According to some embodiments of the invention, the mixing is preferably performed in an inert gas atmosphere. After the second particles are uniformly mixed with the carbon material, the solvent may be removed by heat treatment to obtain a mixture of the second particles and the carbon material. In addition, specific kinds of the above-mentioned solvent are not particularly limited, and a solvent commonly used in the art for mixing the negative electrode slurry, such as polyvinylpyrrolidone, and the like, may be used.
Further, the mixture of the second particles and the carbon material is mechanically mixed uniformly with the first particles to obtain the anode active material.
According to some embodiments of the invention, the method further comprises: graphite particles are added to the negative active material. By doping the graphite particles in the negative active material, the cycle performance of the material can be further improved, and the problem of full charge and rebound of the material can be solved.
In addition, it should be noted that all the features and advantages described above for the negative active material are also applicable to the method for preparing the negative active material, and are not described in detail herein.
In yet another aspect of the present invention, a lithium ion battery is presented. According to an embodiment of the present invention, the lithium ion battery includes: the anode active material of the above example, or the anode active material prepared by the method of the above example. Thus, the lithium ion battery has all the features and advantages described above for the negative active material, and thus, the description thereof is omitted. In general, the lithium ion battery has excellent cycle performance, compaction density and other properties.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
Grinding a part of silica particles by using a high-energy ball mill, and then carrying out amorphous carbon coating through vapor deposition reaction to prepare D50The first particles are 5 to 7 μm.
Coating one part of silica particles with LiH and Mg, grinding the coated silica particles by using a high-energy ball mill, and carrying out amorphous carbon coating by vapor deposition reaction to prepare D50Second particles of 1 to 3 μm.
And uniformly mixing the second particles and the carbon fibers in polyvinylpyrrolidone, and then carrying out heat treatment and drying to remove the polyvinylpyrrolidone, so as to obtain a mixture of the second particles and the carbon fibers.
The second particles are mechanically mixed with the mixture of carbon fibers and the first particles to obtain the negative electrode active material, and the structural schematic diagram of the negative electrode active material is shown in fig. 1. Wherein the mass ratio of the first particles to the second particles to the carbon fibers is 36:5: 5.
Test example 1
The negative electrode active material, commercially available porous silica material, and commercially available carbon-coated silica material prepared in example 1 were divided into 3 groups, and the test materials were mixed with the same binder at the same surface density (80 g/m per surface)2) The copper foil was uniformly coated, rolled using a roller press at the same pressure, and the cold compaction size and the rebound after 24 hours were recorded and compared, the results are shown in tables 1 and 2.
TABLE 1 maximum compaction
Grouping 1 2 3
Example 1 1.72g/cm3 1.74g/cm3 1.73g/cm3
Commercially available porous silica materials 1.65g/cm3 1.62g/cm3 1.65g/cm3
Commercially available carbon-coated silica materials 1.64g/cm3 1.66g/cm3 1.68g/cm3
Rebound Rate after 224 h
Grouping 1 2 3
Example 1 3％ 3.5％ 3.2％
Commercially available porous silica materials 4.8％ 4.5％ 4.2％
Commercially available carbon-coated silica materials 4.6％ 4.3％ 4.3％
The test result shows that the novel silicon-oxygen material can obviously improve the compaction of the material and the rebound of the material after cold pressing.
Test example 2
The negative electrode active material prepared in example 1, a commercially available porous silica material, and a commercially available carbon-coated silica material were taken, the test materials were divided into 3 groups, and graphite particles were doped in a mass ratio of the negative electrode active material to the graphite particles of 5:95, respectively (the schematic structural diagram of the negative electrode active material doped with graphite in example 1 is shown in fig. 2). The positive electrode adopts NCM622 material, and the coating surface density of the negative electrode is 103g/m2The compaction of the negative electrode is 1.60g/cm3A 10A · h laminated battery (same materials except for the negative electrode active material) was produced. The results are shown in tables 3 and 4 comparing their full negative electrode bounce and cycling performance.
TABLE 3 rebound after full charge
Grouping 1 2 3
Example 1+ graphite 20％ 22.6％ 21.2％
Commercially available porous silica material + graphite 25.3％ 24.5％ 24.6％
Commercially available carbon-coated silica material + graphite 26.4％ 26.5％ 28.0％
TABLE 4 Capacity Retention after 500 weeks cycling
Grouping 1 2 3
Example 1+ graphite 96.2％ 96.5％ 97.0％
Commercially available porous silica material + graphite 95.1％ 95.3％ 94.7％
Commercially available carbon-coated silica material + graphite 94.2％ 94.3％ 94.2％
Test results show that the novel silica material blended with graphite can obviously improve the cycle performance of the material and improve the full charge rebound of the negative plate.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A negative active material for a lithium battery, comprising: first particles, second particles, and a carbon material; wherein,
the median particle size of the first particles is greater than the median particle size of the second particles;
the first particle comprises a first body and a first carbon coating layer coated on at least part of the surface of the first body;
the second particles comprise a second body, an active metal layer coated on at least part of the surface of the second body, and a second carbon coating layer coated on at least part of the surface of the active metal layer far away from the second body.
2. The anode active material according to claim 1, wherein the first body and the second body are each independently at least one selected from a group consisting of silica particles and silicon carbon particles.
3. The negative electrode active material according to claim 1, wherein the first particles have a median particle diameter of 5 to 7 μm, and the second particles have a median particle diameter of 1 to 3 μm.
4. The negative active material of claim 1, wherein the active metal layer comprises at least one of a lithium-containing compound and magnesium.
5. The negative electrode active material according to claim 1, wherein the carbon material is at least one selected from carbon fiber, graphene, and carbon nanotube.
6. The negative electrode active material according to claim 1, wherein the mass ratio of the first particles to the second particles to the carbon material is (12-48): (4-5): (5-6).
7. The negative electrode active material according to any one of claims 1 to 6, further comprising: the content of the graphite particles accounts for 80-95% of the total mass of the negative active material;
optionally, the median particle size of the graphite particles is 15-20 μm.
8. A method for producing the negative electrode active material according to any one of claims 1 to 7, comprising:
providing a first body and a second body;
forming a first carbon coating layer on at least part of the surface of the first body to obtain first particles;
forming an active metal layer on at least part of the surface of the second body, and forming a second carbon coating layer on at least part of the surface of the active metal layer far away from the second body to obtain second particles;
mixing the second particles with a carbon material and a solvent to obtain a slurry;
and removing the solvent from the slurry, and mixing the slurry with the first particles to obtain the negative electrode active material.
9. The method of claim 8, further comprising:
graphite particles are added to the negative active material.
10. A lithium ion battery, comprising: the negative electrode active material according to any one of claims 1 to 7, or the negative electrode active material prepared by the method according to claim 8 or 9.
CN202010900474.7A 2020-08-31 2020-08-31 Negative active material, preparation method and application thereof Pending CN112054198A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117117196A (en) * 2023-10-18 2023-11-24 厦门海辰储能科技股份有限公司 Positive electrode material, positive electrode sheet and battery

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