US 12,234,153 B2
Method for preparing graphene-based sodium ion battery negative electrode material
Haijun Yu, Foshan (CN); Yinghao Xie, Foshan (CN); Aixia Li, Foshan (CN); Xuemei Zhang, Foshan (CN); and Changdong Li, Foshan (CN)
Assigned to GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Foshan (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Changsha (CN); and HUNAN BRUNP EV RECYCLING CO., LTD., Changsha (CN)
Appl. No. 18/558,181
Filed by GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Foshan (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Changsha (CN); and HUNAN BRUNP EV RECYCLING CO., LTD., Changsha (CN)
PCT Filed Jul. 28, 2022, PCT No. PCT/CN2022/108657
§ 371(c)(1), (2) Date Oct. 30, 2023,
PCT Pub. No. WO2023/071337, PCT Pub. Date May 4, 2023.
Claims priority of application No. 202111259960.6 (CN), filed on Oct. 28, 2021.
Prior Publication US 2024/0327223 A1, Oct. 3, 2024
Int. Cl. C01B 32/198 (2017.01); C01G 51/04 (2006.01); H01M 10/054 (2010.01)
CPC C01B 32/198 (2017.08) [C01G 51/04 (2013.01); C01P 2002/01 (2013.01); C01P 2004/04 (2013.01); C01P 2006/40 (2013.01); H01M 10/054 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A preparation method for a graphene-based anode material for sodium-ion batteries comprising the following steps:
adding graphene oxide into anhydrous ethanol and conducting ultrasonic treatment at 30° C. to 60° C. to obtain a graphene oxide ethanol dispersion solution;
dissolving cobalt nitrate and sodium nitrite with water to obtain a solution A;
adding acetic acid to the solution A, adding hydrogen peroxide for an oxidation reaction of the cobalt nitrate, and performing solid-liquid separation on a material after the oxidation reaction of the cobalt nitrate to obtain a solution B of sodium hexanitrocobaltate; and
adding the graphene oxide ethanol dispersion solution into the solution B of sodium hexanitrocobaltate, performing solid-liquid separation on a reacted material to obtain a solid, calcining the solid under oxygen isolation at a temperature of 500° C. to 800° C. for 2-8 h, and washing and drying a solid after the calcining to obtain the graphene-based anode material for sodium-ion batteries;
wherein the graphene-based anode material for sodium-ion batteries is composed of cobalt monoxide and nitrogen-doped graphene oxide, wherein the nitrogen-doped graphene oxide has a mass fraction of 30% to 90% and the rest is the cobalt monoxide.