Abstract: A method for preparing a lithium iron phosphate positive electrode material includes: sequentially grinding, spray-drying and sintering a first mixture slurry containing iron phosphate, a lithium source, a carbon source and a solvent to obtain a spherical first lithium iron phosphate material; sequentially grinding, spray-drying, sintering and crushing a second mixture slurry containing iron phosphate, a lithium source, a carbon source and a solvent to obtain a second lithium iron phosphate material with an irregular morphology; and mixing the first and second lithium iron phosphate materials in equal mass ratio to obtain a lithium iron phosphate positive electrode material, the fitted value of the maximum compaction density of which is C, where C=0.0847t1+0.0196T1?0.0095t2+0.0261T2?33.6716.

Abstract: Disclosed are a mixed positive electrode material, a positive electrode plate and a manufacturing method therefor, and a battery. The mixed positive electrode material includes: a ternary material and a phase change material, where the phase change material undergoes a phase change in a charging/discharging voltage range of the ternary material, the ternary material has a single crystal structure, and the phase change material has a single crystal structure or an aggregate structure; a mass fraction ratio of the ternary material to the phase change material is 70:30 to 99.8:0.2; and the ternary material has a nanohardness of 0.001-5 Gpa, and the phase change material has a nanohardness of 0.01-10 GPa.

Abstract: A lithium iron phosphate cathode sheet, a preparation method thereof, and a lithium iron phosphate lithium-ion battery are disclosed, wherein the lithium iron phosphate cathode sheet includes lithium iron phosphate particles, and in the lithium iron phosphate particles, in terms of particle number, a percentage of lithium iron phosphate particles with a particle size in the range of 50 nm-500 nm is 70-90%, a percentage of lithium iron phosphate particles with a particle size greater than 500 nm and less than 1000 nm is 5-20%, and a percentage of lithium iron phosphate particles with a particle size in the range of 1 ?m-10 ?m is 2-10%.