Phosphate positive electrode material, preparation method thereof and lithium ion battery

The invention relates to the technical field of lithium ion batteries, in particular to a phosphate positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: dispersing a primary semi-finished product of the phosphate positive electrode material in a solvent, and adding an etching agent to etch the particle surface of the primary semi-finished product to obtain a secondary semi-finished product; the particle surface crystallinity of the primary semi-finished product is lower than the particle internal crystallinity; and mixing the secondary semi-finished product with the supplemented raw materials of the phosphate positive electrode material, and carrying out secondary sintering to obtain a finished product of the phosphate positive electrode material, the raw materials comprise an organic iron source; the use amount of the etching agent is 1.2 wt%-8 wt% of the primary semi-finished product. The phosphate positive electrode mater