Artificial graphite and preparation method thereof, secondary battery containing such artificial graphite, and electric apparatus
AssigneeContemporary Amperex Technology Co., Limited
InventorsRui Shen, Libing He
Life of this patent
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Abstract
An artificial graphite material A. The artificial graphite material A is secondary particles are provided. In some embodiments, a surface roughness ηA of the artificial graphite material A satisfies 6≤ηA≤12. This application further provides an artificial graphite material B. The artificial graphite material B is primary particles, where a surface roughness ηB of the artificial graphite material B satisfies 2.5≤ηB≤5. This application further provides a secondary battery containing the artificial graphite material A and/or the artificial graphite material B and an electric apparatus. The secondary battery provided by this application can have high energy density and long service life.
Claims9
An artificial graphite material A used as a negative electrode active material for a secondary battery, wherein the artificial graphite material A is secondary particles, a median particle size by volume Dv50A of the artificial graphite material A is from 10 μm to 20 μm, and a surface roughness ηA of the artificial graphite material A satisfies 7≤ηA≤10, wherein a tap density of the artificial graphite material A is 0.8-1.4 g/cm3.
A preparation method of artificial graphite material A, comprising the following steps in sequence:
- (A1) providing a raw material, and performing crushing and shaping to obtain a crushed particle product;
- (A2) performing granulation on the crushed particle product;
- (A3) performing graphitization treatment to obtain a graphitization product;
- and
- (A4) performing surface roughening treatment on the graphitization product to obtain the artificial graphite material;
- wherein the artificial graphite material A is secondary particles, a median particle size by volume Dv50A of the artificial graphite material A is from 10 μm to 20 μm, and a surface roughness of the artificial graphite material A satisfies 7≤ηA≤10, and a tap density of the artificial graphite material A is 0.8-1.4 g/cm3.
Dependencies are inferred from the claim text.