	US 12,406,979 B2
	Carbon-coated lithium-rich oxide composite material and preparation method thereof
Guangchun Cheng, Huangshi (CN); Jie Sun, Huangshi (CN); and Zhonglin He, Huangshi (CN)
Assigned to HUBEI RT ADVANCED MATERIALS GROUP COMPANY LIMITED, Huangshi (CN)
Appl. No. 17/783,654
Filed by HUBEI RT ADVANCED MATERIALS GROUP COMPANY LIMITED, Huangshi (CN)
PCT Filed Jul. 24, 2020, PCT No. PCT/CN2020/104574 § 371(c)(1), (2) Date Jun. 9, 2022, PCT Pub. No. WO2022/007021, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 202010657297.4 (CN), filed on Jul. 9, 2020.
Prior Publication US 2023/0121840 A1, Apr. 20, 2023
Int. Cl. H01M 4/04 (2006.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/525 (2010.01)

CPC H01M 4/0471 (2013.01) [H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)]

8 Claims

1. A method for preparing a carbon-coated lithium-rich oxide composite material, wherein, comprising the following steps:

(1) mixing an iron source or a cobalt source with a lithium source to obtain a mixture, and performing a first sintering to obtain a lithium-rich oxide Li₅FeO₄or Li₆CoO₄; wherein, a molar ratio of the lithium source to the iron source is 5-25:1, and a molar ratio of the lithium source to the cobalt source is 6-30:1;

(2) crushing the lithium-rich oxide obtained in the step (1); and

(3) mixing the lithium-rich oxide crushed in the step (2) with a carbon source, and performing a second sintering to obtain the carbon-coated lithium-rich oxide composite material, wherein the carbon source is one or more of conductive carbon black, Ketjen black, carbon nanotube, acetylene black, vapor-grown carbon fiber, graphene and biomass carbon;

wherein, in the step (3), the second sintering comprises heating to a second sintering temperature at a second preset heating rate at the inert gas atmosphere; wherein, the second preset heating rate is 1-10° C./min; and the second sintering temperature is 200-600° C.