US 12,252,400 B1
Preparation method for lithium iron phosphate cathode material and lithium battery
Tao Chen, Xiangtan (CN); Xinlong Huang, Xiangtan (CN); Yang Yu, Xiangtan (CN); and Kun Cheng, Xiangtan (CN)
Assigned to Hunan Yuneng new energy battery materials Co., LTD., Hunan (CN)
Filed by Hunan Yuneng new energy battery materials Co., LTD., Xiangtan (CN)
Filed on Dec. 3, 2024, as Appl. No. 18/967,384.
Claims priority of application No. 202410819405.1 (CN), filed on Jun. 24, 2024.
Int. Cl. H01M 4/02 (2006.01); C01B 25/30 (2006.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/58 (2010.01)
CPC C01B 25/30 (2013.01) [H01M 4/02 (2013.01); H01M 4/04 (2013.01); H01M 4/36 (2013.01); H01M 4/58 (2013.01); C01P 2006/40 (2013.01)] 7 Claims
 
1. A preparation method for lithium iron phosphate cathode material, characterized in that comprising:
S11. adding lithium source, iron source, phosphorus source, first carbon source, dopant, and dispersant into a solvent in a preset ratio for mixing and grinding treatment to obtain a first mixture;
S12. drying the first mixture and performing a first sintering in an inert gas atmosphere to obtain a lithium iron phosphate precursor;
S13. adding borohydride, deionized water, second carbon source, and dispersant to the lithium iron phosphate precursor for pretreatment to obtain a lithium iron phosphate precursor mixture, wherein the borohydride is borohydride nanosheet or borohydride nanofilm;
S14. after grinding and drying the lithium iron phosphate precursor mixture, performing a second sintering in an inert gas atmosphere to obtain a coated doped type lithium iron phosphate cathode material,
wherein the step S13 comprises:
adding the borohydride, the deionized water, the second carbon source, and the dispersant into the lithium iron phosphate precursor in predetermined amounts for mixing, grinding, and drying to obtain a second mixture;
wherein the second mixture after ultraviolet light irradiation and drying is used to obtain the lithium iron phosphate precursor mixture.