US 12,110,231 B2
Expanded graphite and preparation method therefor
Linshao Zhang, Guangdong (CN); Changdong Li, Guangdong (CN); Dingshan Ruan, Guangdong (CN); You Zhou, Guangdong (CN); Qiang Li, Guangdong (CN); and Yong Cai, Guangdong (CN)
Assigned to GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Guangdong (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Hunan (CN); and YICHANG BRUNP RECYCLING TECHNOLOGY CO., LTD, Hubei (CN)
Appl. No. 18/289,488
Filed by GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Guangdong (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Hunan (CN); and YICHANG BRUNP RECYCLING TECHNOLOGY CO., LTD., Hubei (CN)
PCT Filed Aug. 31, 2022, PCT No. PCT/CN2022/116252
§ 371(c)(1), (2) Date Nov. 3, 2023,
PCT Pub. No. WO2023/109192, PCT Pub. Date Jun. 22, 2023.
Claims priority of application No. 202111540314.7 (CN), filed on Dec. 16, 2021.
Prior Publication US 2024/0239664 A1, Jul. 18, 2024
Int. Cl. C01B 32/225 (2017.01); H01M 10/54 (2006.01)
CPC C01B 32/225 (2017.08) [C01P 2004/03 (2013.01); H01M 10/54 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A preparation method for an expanded graphite, comprising the following steps:
(1) mixing a graphite powder with a metal peroxide and/or an alkali metal superoxide under a protective atmosphere, and leaving the mixture to stand still, to obtain a mixed graphite-metal peroxide and/or graphite-alkali metal superoxide composite material;
(2) putting the composite material prepared in step (1) into a liquid medium capable of reacting with the metal peroxide and/or the alkali metal superoxide for reacting, to obtain an intercalated graphite; and
(3) heating the intercalated graphite prepared in step (2) to prepare the expanded graphite,
wherein the metal peroxide is at least one of CaO2, K2O2, Na2O2 and Li2O2;
the alkali metal superoxide is at least one of KO2 and NaO2; and
a mass ratio of the graphite powder to the metal peroxide and/or the alkali metal superoxide in step (1) is (1 to 20):1.