Composite phosphate-based positive electrode material, preparation method and application thereof

Abstract

The application belongs to the technical field of battery materials, and particularly relates to a composite phosphate-based positive electrode material and a preparation method and application thereof. The application comprises the following steps: preparing phosphate-based active particles and titanium-doped phosphate-based active particles through primary sintering, wherein the particle size of the phosphate-based active particles is larger than that of the titanium-doped phosphate-based active particles; mixing the phosphate-based active particles, the titanium-doped phosphate-based active particles, a composite carbon source and a heteroatom source, and then performing sintering treatment to obtain the composite phosphate-based positive electrode material. Through the doping of titanium elements in the active particles, the doping of heteroatoms in the carbon coating layer, and the mutual filling and grading between the composite phosphate-based active particles with different particle sizes, different morphologies and different densities and the doped composite phosphate-based positive electrode particles, the compaction density of the composite phosphate-based positive electrode material can be better improved, so that the gram capacity of the composite phosphate-based positive electrode material is improved.

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