US 12,249,715 B2
Composite artificial graphite and preparation method thereof, and secondary battery and power consuming device comprising the composite artificial graphite
Yuanyuan Li, Ningde (CN); Rui Shen, Ningde (CN); and Libing He, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Oct. 30, 2022, as Appl. No. 18/051,008.
Application 18/051,008 is a continuation of application No. PCT/CN2021/119709, filed on Sep. 22, 2021.
Prior Publication US 2023/0087876 A1, Mar. 23, 2023
Int. Cl. H01M 4/583 (2010.01); H01M 4/04 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/583 (2013.01) [H01M 4/0471 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A preparation method of a composite artificial graphite, comprising:
preparing a first graphite, comprising:
crushing, grading, and shaping a first raw material to obtain a first precursor;
granulating the first precursor to obtain a first intermediate; and
graphitizing the first intermediate at a temperature of 2800° C. to 3200° C. to obtain the first graphite;
wherein the first graphite includes secondary particles and has a graphite interlayer spacing of 0.33560 nm to 0.33610 nm;
preparing a second graphite, comprising:
crushing, grading, and shaping a second raw material to obtain a second precursor;
graphitizing the second precursor at a temperature of 2500° C. to 2700° C. to obtain the second graphite;
wherein the second graphite includes primary particles and has a graphite interlayer spacing of 0.33620 nm to 0.33670 nm; and
uniformly mixing the first graphite and the second graphite at a mass percentage of the first graphite of 40% to 90% and a mass percentage of the second graphite of 10% to 60%, to obtain the composite artificial graphite, wherein the mass percentage of the first graphite and the mass percentage of the second graphite are based on a weight of the composite artificial graphite.