	US 12,269,745 B2
	Natural graphite, modified natural graphite material prepared therefrom, preparation method, and applications
Dongdong Li, Shenzhen (CN); Haihui Zhou, Shenzhen (CN); Chengkun Zhou, Shenzhen (CN); and Xuan Wu, Shenzhen (CN)
Assigned to BTR NEW MATERIAL GROUP CO., LTD, Guangdong (CN)
Appl. No. 17/043,350
Filed by BTR NEW MATERIAL GROUP CO., LTD., Shenzhen (CN)
PCT Filed Aug. 1, 2019, PCT No. PCT/CN2019/098885 § 371(c)(1), (2) Date Sep. 29, 2020, PCT Pub. No. WO2020/107927, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 201811443746.4 (CN), filed on Nov. 29, 2018.
Prior Publication US 2021/0017028 A1, Jan. 21, 2021
Int. Cl. C01B 32/20 (2017.01); C01B 32/21 (2017.01); H01M 4/02 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)

CPC C01B 32/20 (2017.08) [C01B 32/21 (2017.08); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); C01P 2004/51 (2013.01); C01P 2006/11 (2013.01); C01P 2006/12 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)]

12 Claims

1. A preparation method of modified natural graphite material, the preparation method comprising:

sequentially performing a solidification, an isotropic treatment, a carbonization treatment, and a crushing on a natural graphite as a raw material to obtain the modified natural graphite material,

wherein the natural graphite is prepared by crushing natural flake graphite, and

wherein the natural graphite has all of the following features:

a particle size D50 smaller than 10 μm, and D90/D10<2.5;

a 002 interplanar spacing in a range of 0.336 to 0.360 nm, and 30≤I₀₀₂/I₁₁₀≤35;

a saturated tap density greater than or equal to 0.6 g/cc and smaller than1.3 g/cc; and

a specific surface area greater than or equal to 1.0 m²/g and smaller than 10.0 m²/g.