US 12,255,321 B2
Method for preparing ferroboron alloy-coated lithium iron phosphate
Qin Wang, Hubei (CN)
Assigned to HUBEI WANRUN NEW ENERGY TECHNOLOGY CO., LTD., Hubei (CN)
Appl. No. 18/259,852
Filed by HUBEI WANRUN NEW ENERGY TECHNOLOGY CO., LTD., Hubei (CN)
PCT Filed Dec. 9, 2022, PCT No. PCT/CN2022/137775
§ 371(c)(1), (2) Date Jun. 29, 2023,
PCT Pub. No. WO2023/179100, PCT Pub. Date Sep. 28, 2023.
Claims priority of application No. 202210294927.5 (CN), filed on Mar. 24, 2022.
Prior Publication US 2025/0006898 A1, Jan. 2, 2025
Int. Cl. C01B 25/37 (2006.01); B22F 1/18 (2022.01); C01B 25/30 (2006.01); C01B 25/45 (2006.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/58 (2010.01)
CPC H01M 4/366 (2013.01) [B22F 1/18 (2022.01); C01B 25/30 (2013.01); C01B 25/375 (2013.01); C01B 25/45 (2013.01); H01M 4/38 (2013.01); H01M 4/5825 (2013.01); B22F 2301/35 (2013.01); B22F 2303/30 (2013.01); C01P 2004/03 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C01P 2006/11 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for preparing ferroboron alloy-coated lithium iron phosphate, comprising:
preparing ferrous phosphate and lithium phosphate, respectively, then mixing the ferrous phosphate and the lithium phosphate and adding a hydrazine hydrate solution to obtain a mixture which is then subjected to grinding, drying and then calcining to obtain a calcined material, adding pure water to the calcined material and grinding the calcined material in water to obtain a slurry, to which PEG, ferrous sulfate crystals and disodium EDTA are added and stirred to dissolve, then adding a sodium borohydride solution and a sodium hydroxide solution while stirring and maintaining a pH in the process at 8.5-10.5, reacting for 15-30 min to obtain a product, and filtering, washing and vacuum drying the product to obtain the ferroboron alloy-coated lithium iron phosphate.