▎ 摘　　要

NOVELTY - High-energy-density lithium iron phosphate, comprises large-particle lithium iron phosphate and small-particle lithium iron phosphate in mass ratio of 1-10:10-19, and has particle size ratio of 2-6:1. USE - High-energy-density lithium iron phosphate used in power batteries and energy storage. ADVANTAGE - The high-energy-density lithium iron phosphate has high energy density and high compaction density, and the preparation method has simple synthesis process, controllable grain size gradation and uniform material mixing. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing high energy density lithium iron phosphate, which involves: (1) homogenizing, coarse grinding and fine grinding an iron phosphate raw material, a lithium source, a carbon source, a doping element and pure water to prepare lithium iron phosphate slurry; (2) taking portion of the lithium iron phosphate slurry, adding a centrifugal spray peristaltic pump, and spraying a large-particle lithium iron phosphate precursor by adjusting the frequency of a centrifugal spray head; (3) taking portion of the lithium iron phosphate slurry, adding a two-fluid peristaltic pump, and spraying a small-particle lithium iron phosphate precursor by controlling the air pressure of two-fluid spraying; (4) controlling the doping proportion of two different particle sizes by adjusting the flow rate of a centrifugal spraying peristaltic pump and a two-fluid spraying peristaltic pump to prepare a lithium iron phosphate precursor prepared from a large-particle lithium iron phosphate precursor and a small-particle lithium iron phosphate precursor according to different doping proportions; (5) sintering the lithium iron phosphate precursor in a protective atmosphere to prepare the lithium iron phosphate.