Preparation method of lithium-rich manganese-based positive electrode material

The invention provides a lithium-rich manganese-based positive electrode material and a preparation method thereof, the lithium-rich manganese-based positive electrode material is prepared by coating a primary sintering product prepared from a lithium-rich manganese-based precursor and a lithium source with a coating agent, the coating agent is prepared from an A-element-containing compound and a lithium source, the prepared coating agent is of a spinel structure, and the coating agent is a lithium-rich manganese-based positive electrode material. The stability of the crystal structure of the lithium-rich manganese-based positive electrode material can be effectively improved, the specific discharge capacity and coulombic efficiency of the positive electrode material are improved, meanwhile, the discharge median voltage of the positive electrode material is increased, and the voltage hysteresis phenomenon is improved. 本发明提供了一种富锂锰基正极材料及其制备方法，该富锂锰基正极材料由富锂锰基前驱体和锂源制得的一次烧结产物经包覆剂包覆制得，该包覆剂由含A元素化合物和锂源制得，制得的包覆剂为尖晶石结构，