US 12,170,371 B2
Lithium iron phosphate, preparation method therefor, and lithium-ion battery
Haifeng Yue, Tianjin (CN); Huan Guo, Tianjin (CN); Chen Yang, Tianjin (CN); Xiaobing Xi, Tianjin (CN); Caide Yang, Tianjin (CN); Youyuan Huang, Tianjin (CN); and Xueqin He, Tianjin (CN)
Assigned to LBM NEW ENERGY (AP) PTE. LTD., Singapore (SG)
Appl. No. 17/996,766
Filed by LBM NEW ENERGY (AP) PTE. LTD., Singapore (SG)
PCT Filed Feb. 8, 2022, PCT No. PCT/CN2022/075496
§ 371(c)(1), (2) Date Oct. 20, 2022,
PCT Pub. No. WO2022/171074, PCT Pub. Date Aug. 18, 2022.
Claims priority of application No. 202110178973.4 (CN), filed on Feb. 9, 2021.
Prior Publication US 2023/0170481 A1, Jun. 1, 2023
Int. Cl. H01M 4/58 (2010.01); C01B 25/45 (2006.01); H01M 4/02 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/5825 (2013.01) [C01B 25/45 (2013.01); H01M 10/0525 (2013.01); C01P 2002/72 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A preparation method of lithium iron phosphate, comprising:
sintering a dry material containing an iron source, a lithium source, a phosphorus source, and a reducing carbon source to obtain the lithium iron phosphate, wherein
a sintering atmosphere comprises a mild oxidizing gas, the mild oxidizing gas comprises carbon dioxide and a protective gas, wherein the protective gas comprises at least one of nitrogen, argon, helium, and neon, a total gas flow rate in the sintering atmosphere is 3 L/min to 6 L/min, and a sintering temperature is 800° C. to 900° C.