Synthesis method of lithium ion battery composite cathode material LiMn1-xFexPO4/C

The invention relates to a synthesis method of lithium ion battery composite cathode material LiMn1-xFexPO4/C. A manganese source, an iron source, a phosphorus source and an organic carbon source are evenly mixed and processed by a high-energy ball mill. Mixtures are subjected to heat treatment at 500-700 DEG C under the protection of inert atmosphere so that (Mn1-xFex)2P2O7/C can be prepared; then, pyrophosphate/carbon, a lithium source and a carbon source are mixed, heat treatment is performed at 600-750 DEG C under protection of inert atmosphere, and ferromanganese lithium phosphate/carbon anode materials with a composite conductive network are obtained. The synthesis method is suitable for large-scale industrialized production, the prepared materials are composed of secondary particles of primary nano-crystals covered with amorphous carbon, distribution is uniform, and the uniform conductive network is formed on the surfaces of phosphate particles in an in-situ mode. The obtained composite cathode material has high rate capacity and high compaction intensity and has good application prospects in the aspect of high-energy-density lithium ion batteries.