	US 12,012,331 B2
	Preparation method of porous sodium iron phosphate used as sodium ion battery cathode 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. 18/260,033
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 Aug. 25, 2022, PCT No. PCT/CN2022/114920 § 371(c)(1), (2) Date Jun. 29, 2023, PCT Pub. No. WO2023/093158, PCT Pub. Date Jun. 1, 2023.
Claims priority of application No. 202111421179.4 (CN), filed on Nov. 26, 2021.
Prior Publication US 2024/0067525 A1, Feb. 29, 2024
Int. Cl. C01B 25/45 (2006.01); H01M 4/1397 (2010.01); H01M 4/58 (2010.01)

CPC C01B 25/45 (2013.01) [H01M 4/1397 (2013.01); H01M 4/5825 (2013.01); C01P 2004/03 (2013.01); C01P 2006/40 (2013.01)]

10 Claims

1. A preparation method of porous sodium iron phosphate used as a sodium ion battery cathode material, comprising the following steps:

S1: mixing ferrous nitrate, silver nitrate and a reducing agent into a mixed solution;

S2: dropwise adding the mixed solution to a carbonate solution for reaction under the condition of oxygen isolation, and performing solid-liquid separation on a resulting reaction product to obtain a precipitate;

S3: mixing the precipitate with sodium dihydrogen phosphate and sodium iodide, and then grinding a resulting mixture to obtain a ground material; and

S4: sintering the ground material under the condition of air isolation to obtain a sintered material, soaking the sintered material in an organic solvent, and performing solid-liquid separation on the organic solvent soaking with the sintered material to obtain the porous sodium iron phosphate used as the sodium ion battery cathode material.