Lithium ion battery cathode material LiFe1-xMnxPO4/C was prepared by high temperature solid state method, and the effects of Mn modificatin on the structure, morphology and electrochemical properties of the material were researched. The results show that the olivine structure lithium manganese iron phosphate material was obtained by high temperature solid state method, and no impurity phase existed. A small amount of Mn doping does not have much influence on the structural morphology of the material, but significantly improves the electrochemical performance. When the Mn content was 0.02 (molar content), the specific discharge capacity of the material reached 154mAh/g at 0.2C rate, which is significantly higher than that of the Mn content was 0.00 (molar content). Moreover, Mn doping can effectively improve the capacity performance at high rate. And the electrochemical reaction resistance is reduced, explaining that the addition of Mn improved the electrochemical performance of the material.
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