Improved Performance of Hydrothermally Synthesized LiMnPO sub(4) by Mg Doping

LiMnPO sub(4) has been much attention for cathode material of next generation lithium ion battery. The most serious problem of this cathode material is intrinsic low electronic conductivity. In this study, Mg doping to carbon-coated LiMnPO sub(4) prepared by hydrothermal route was performed to improve the electronic conductivity. The Mg doping did not affect on particle size and shape of LiMnPO sub(4) as well as formation of surface carbon layer. In charge and discharge test, improvement of performance of LiMnPO sub(4) due to the Mg doping was clearly demonstrated. The improvement is attributed to superior electronic conductivity due to the Mg doping.