US 12,113,215 B2
Preparation method for Prussian blue sodium-ion battery positive electrode material
Haijun Yu, Guangdong (CN); Yinghao Xie, Guangdong (CN); Aixia Li, Guangdong (CN); Xuemei Zhang, Guangdong (CN); and Changdong Li, Guangdong (CN)
Assigned to GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Guangdong (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Hunan (CN); and HUNAN BRUNP EV RECYCLING CO., LTD., Hunan (CN)
Appl. No. 18/555,558
Filed by GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Guangdong (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Hunan (CN); and HUNAN BRUNP EV RECYCLING CO., LTD., Hunan (CN)
PCT Filed Jul. 29, 2022, PCT No. PCT/CN2022/109229
§ 371(c)(1), (2) Date Oct. 16, 2023,
PCT Pub. No. WO2023/071352, PCT Pub. Date May 4, 2023.
Claims priority of application No. 202111246996.0 (CN), filed on Oct. 26, 2021.
Prior Publication US 2024/0088383 A1, Mar. 14, 2024
Int. Cl. H01M 4/58 (2010.01); C01C 3/12 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/58 (2013.01) [C01C 3/12 (2013.01); C01P 2004/03 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A preparation method of a positive electrode material for Prussian blue analogue sodium ion battery, comprising steps of:
adding a first nonionic surfactant and an antioxidant to a sodium ferrocyanide solution to obtain a first solution;
adding a second nonionic surfactant to a transition metal salt solution to obtain a second solution;
under a protective gas atmosphere, adding the second solution to the first solution for precipitation reaction, aging after the reaction is finished, collecting a precipitate, and washing; and
vacuum drying the washed precipitate, then soaking in an alcohol solution containing sodium alkoxide, filtering, and evaporating to dryness to obtain a positive electrode material for Prussian blue analogue sodium ion battery;
wherein the first nonionic surfactant and the second nonionic surfactant are independently one or both of polyethylene glycol and polyoxyethylene alkyl amide alcohol; the first nonionic surfactant is the same as the second nonionic surfactant; molecular weights of the first nonionic surfactant and the second nonionic surfactant are both ≥1500 g/mol; a concentration of the first nonionic surfactant in the first solution and a concentration of the second nonionic surfactant in the second solution are both 0.001-0.1 mol/L.