▎ 摘　　要

LiMn(0.8)Fe(0.2)PO(4)is a potential candidate cathode material to balance the energy density, safety, and cost of power lithium ion batteries. However, the low electronic conductivity and ion diffusion coefficient limit its application. Here, bimetallic oxalate Mn0.8Fe0.2C2O4 center dot 2H(2)O/graphene oxide (Mn0.8Fe0.2C2O4 center dot 2H(2)O/GO) is designed to synthesize homogeneously distributed LiMn0.8Fe0.2PO4/reduced graphene oxide/carbon (LiMn0.8Fe0.2PO4/rGO/C) composite. The influence of rGO on the morphologies, structure, and electrochemical performance of the as-synthesized composite is investigated. The composite LiMn0.8Fe0.2PO4/rGO/C delivers discharge capacity of 153.2 mAh g(-1)at 0.05 C and 127.3 mAh g(-1)at 5 C, and 97.2% capacity retention even after 300 cycles at 1 C. The results confirm that the introduction of rGO sheets can alleviate the agglomeration of LiMn(0.8)Fe(0.2)PO(4)particles. Furthermore, the conductive network composed of rGO sheets and pyrolytic organic carbon links the particles together to improve the migration pathways of electrons and lithium ions, thus enhancing the electrochemical performance of LiMn0.8Fe0.2PO4/rGO/C.