US 11,840,452 B2
Spherically-shaped coated graphite, negative electrode for lithium ion secondary battery, and lithium ion secondary battery
Ryota Yamaji, Tokyo (JP); Yasushi Madokoro, Tokyo (JP); Akira Matsuzaki, Tokyo (JP); Yusuke Fushiwaki, Tokyo (JP); and Mikito Suto, Tokyo (JP)
Assigned to JFE Chemical Corporation, Tokyo (JP); and JFE Steel Corporation, Tokyo (JP)
Appl. No. 18/030,097
Filed by JFE CHEMICAL CORPORATION, Tokyo (JP); and JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Jul. 28, 2022, PCT No. PCT/JP2022/029174
§ 371(c)(1), (2) Date Apr. 4, 2023,
PCT Pub. No. WO2023/021958, PCT Pub. Date Feb. 23, 2023.
Claims priority of application No. 2021-132828 (JP), filed on Aug. 17, 2021.
Prior Publication US 2023/0286806 A1, Sep. 14, 2023
Int. Cl. C01B 32/21 (2017.01); H01M 4/36 (2006.01); H01M 4/583 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC C01B 32/21 (2017.08) [H01M 4/366 (2013.01); H01M 4/583 (2013.01); H01M 10/0525 (2013.01); C01P 2004/32 (2013.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 17 Claims
OG exemplary drawing
 
1. Spherically-shaped coated graphite comprising:
spherically-shaped graphite in which primary particles with an equivalent spherical diameter of not more than 0.8 μm have a volume ratio of more than 40.0% and not more than 70.0%, and primary particles with an equivalent spherical diameter of not less than 1.5 μm and not more than 3.0 μm have a volume ratio of not less than 3.0% and not more than 17.0%, in a particle size distribution of primary particles that is obtained using X-ray computed tomography; and
a carbonaceous substance covering the spherically-shaped graphite,
wherein a pore volume of pores with a pore size of not less than 7.8 nm and not more than 36.0 nm is not more than 0.017 cm3/g, and
a mass of infiltrated dibutyl phthalate in the spherically-shaped coated graphite is less than 0.70 g/cm3.