▎ 摘　　要

NOVELTY - Preparing modified lithium manganese iron phosphate material, comprises mixing iron source, manganese source, phosphorus source, modifier, and solvent to obtain pretreatment slurry. Lithium source, carbon source, solvent, and the obtained pretreatment slurry are mixed, dried and sintered to obtain the modified lithium manganese iron phosphate material. The modifying agent includes composite carbon source and/or doping metal compound. USE - Method for preparing modified lithium manganese iron phosphate material used in a battery (claimed). ADVANTAGE - The method provides modified manganese phosphate iron material lithium with improved conductive ability, stability and cycle performance. The doped metal compound solves the problem of the structure damage caused by manganese dissolving in the circulation process, improves the stability and improves the cycle performance of the battery. The composite carbon source is good for forming a conductive network in the synthesis process to improve the conductive capability of the material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) the preparation method of modified phosphoric acid manganese iron material lithium to claim or; (2) the modified phosphoric acid manganese iron material lithium to claim; (3) a battery.