▎ 摘　　要

LiMnPO4 was synthesized by solvothermal method. LiMnPO4/carbon/graphene composites with different amount of pyrolytic carbon and graphene were prepared using sucrose and graphene as carbon sources. The effect of pyrolytic carbon and graphene on the performance of material was investigated. The morphology of the material was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). Pyrolytic carbon coating can enhance the surface electronic conductivity of LiMnPO4 nanoplates, which plays a major role in improving the performances of the material. Graphene can enhance the electronic and ionic conductivity between nanoplates, and then improve the electrochemical properties of the material. Electrochemical measurements indicate that LiMnPO4 electrode with 4% pyrolytic carbon and 2% graphene exhibits better electrochemical performances. The specific capacity is 139.1 mAh.g(-1) at 0.5C and the capacity retention is 93.6% after 100 cycles. Compared with single carbon and single graphene LiMnPO4 electrode, the specific capacity at 0.5C of LMP-C(4)-G(2) electrode is increased by 35.0% and 48.6%.