Lithium-containing phosphate positive electrode material and preparation method and application thereof

The invention belongs to the technical field of battery materials, and particularly relates to a lithium-containing phosphate positive electrode material and a preparation method and application thereof. The lithium-containing phosphate positive electrode material comprises a plurality of composite particles, each composite particle comprises a lithium-containing phosphate inner core and a carbon shell layer coating the outer surface of the inner core, the carbon shell layer is doped with heteroatoms, and the heteroatoms comprise at least one of phosphorus atoms, nitrogen atoms and sulfur atoms; a three-dimensional network structure of a carbon nanomaterial is formed among the plurality of composite particles. According to the lithium-containing phosphate positive electrode material disclosed by the invention, through triple effects of carbon coating, heteroatom doping and a three-dimensional conductive network framework formed by the carbon nanomaterial between bulk phases, the lithium-containing phosphate p