Synthesis and Electrochemical Performance of LiMnPO 4 by Hydrothermal Method

Abstract

LiMnPO 4 with olivinestructure which is the promising candidate for high voltage cathode material was synthesized by hydrothermal method. In order to synthesize high purity and well-defined LiMnPO 4 , several precursors for Li, Mn, and P sources and hydrothermal reaction parameters including temperature and [H 2 O]/[Mn] value are optimized. By analyzing the structure, Mn valence, morphology, and chemical ratio via XRD, XPS, Raman, SEM, and ICP LiMnPO 4 synthesized from manganese acetate tetrahydrate have single phase of LiMnPO 4 without impurity and showed charge and discharge reaction caused by Mn 2+ /Mn 3+ redox. Specific capacity of synthesized LiMnPO 4 grew up during cycling. Moreover, when hydrothermal temperature was set at 150°C and [H 2 O]/[Mn] value was set at 15, discharge capacity as high as 70 mAh/g was obtained at 1/20 C rate.