Preparation method of high-capacity and high-compaction lithium iron phosphate positive electrode material and prepared lithium iron phosphate positive electrode material

The invention discloses a preparation method of a high-capacity and high-compaction lithium iron phosphate positive electrode material, which comprises the following steps: (1) weighing a lithium source, an iron source, a phosphorus source, an antioxidant and a doping element according to the molar ratio of Li to Fe to P of (1-1.2): 1: (0.9-1.2), adding ethanol and a carbon source, and stirring to uniformly disperse to obtain a lithium iron phosphate precursor 1; (2) carrying out low-temperature sintering on the lithium iron phosphate precursor 1 obtained in the step (1) under the condition of inert protective gas to obtain a lithium iron phosphate precursor 2; and (3) adding a carbon source and a doping element into the lithium iron phosphate precursor 2, sanding, performing spray drying, and performing high-temperature sintering under the condition of inert protective gas to obtain the high-capacity and high-compaction lithium iron phosphate positive electrode material. The high-performance lithium iron pho