Improvement of Electrochemical Properties of LiMn2O4 Cathode Material by LiMnPO4 Coating via Hydrothermal Method

LiMnPO4 coated LiMn2O4 with different contents were prepared via hydrothermal method, and their structural and electrochemical properties were characterized by XRD, Raman, SEM, TEM and charge-discharge test. Generally, the modification of LiMnPO4 on the surface of the LiMn2O4 could not only increase the reversible capacity, but also upgrade its cyclic performances when cells were operated at 55 degrees C. In the case of the 1wt% LiMnPO4 coated LiMn2O4, its reversible capacity is about 109 mAh.g(-1) when cell was operated at 55 degrees C, which is about 96% of its initial capacity. Moreover, 1wt% LiMnPO4 coated LiMn2O4 exhibits an improved rate capability compared with that of the bare LiMn2O4.