| abstract |
The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, and discloses a preparation method of a high-pressure compacted lithium iron phosphate material and a lithium iron phosphate material prepared by the method. The method includes the following steps: (1) adding an iron source, a lithium source, a phosphorus source, a carbon source and an additive to a dispersant, keeping the molar ratio of lithium element to iron element at 1-1.1:1, and grinding in a grinding machine, Obtaining the first slurry; (2) adding iron source, lithium source, phosphorus source, carbon source and additives to the first slurry again, keeping the iron source, lithium source, The mass ratio of the phosphorus source, the carbon source and the additive is 0.05-2:1, and grinding to obtain a second slurry; (3) spray drying the second slurry to obtain a lithium iron phosphate precursor; (4) in an inert The lithium iron phosphate precursor is sintered in an atmosphere, and a lithium iron phosphate material is obtained after pulverization. The lithium iron phosphate material prepared by the invention has higher compaction density and charge-discharge performance. |