	US 12,258,274 B2
	Preparation method for long-cycle modified graphite-based composite material and lithium ion battery comprising the material
Xiujun Pan, Guangdong (CN); Dongdong Li, Guangdong (CN); Haihui Zhou, Guangdong (CN); Jianguo Ren, Guangdong (CN); Youyuan Huang, Guangdong (CN); and Min Yue, Guangdong (CN)
Assigned to BTR NEW MATERIAL GROUP CO., LTD., Guangdong (CN)
Appl. No. 17/043,535
Filed by BTR NEW MATERIAL GROUP CO., LTD., Guangdong (CN)
PCT Filed Feb. 18, 2019, PCT No. PCT/CN2019/075334 § 371(c)(1), (2) Date Sep. 29, 2020, PCT Pub. No. WO2019/237758, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 201810594938.9 (CN), filed on Jun. 11, 2018.
Prior Publication US 2021/0107795 A1, Apr. 15, 2021
Int. Cl. C01B 32/21 (2017.01); C04B 35/52 (2006.01); H01M 10/0525 (2010.01)

CPC C01B 32/21 (2017.08) [C04B 35/522 (2013.01); H01M 10/0525 (2013.01); C01P 2004/32 (2013.01); C01P 2004/61 (2013.01)]

18 Claims

1. A method for preparing a long-cycle modified graphite-based composite material, the method comprising:

step 1 of mixing a graphite material and a coating modifier in a mass ratio of 100: (1-35);

step 2 of placing a mixture obtained in step 1 into a self-pressurized reaction device, then placing the device in a heating apparatus to perform a self-pressurized impregnation experiment, during which temperature is controlled to increase in such a manner that the coating modifier is gradually liquefied after reaching a softening point, to completely impregnate the graphite material under self-pressurizing and to be distributed on a surface of the graphite material, wherein a pressure in the self-pressurized reaction device increases automatically without controlling valves to charge gas or discharge gas;

step 3 of cooling, during which the coating modifier distributed on the surface of the graphite material is re-cured on the surface of the graphite material; and

step 4 of performing a heat treatment in an inert atmosphere to obtain the modified graphite-based composite material.