Enhanced electrochemical performance of LiFePO4 coated with Li0.34La0.51TiO2.94 by rheological phase reaction method

Li0.34La0.51TiO2.94 (LLTO), as a high ionically conductive material, has been coated on the surface of olivine-type LiFePO4 by rheological phase reaction method. The structure and electrochemical properties of the prepared cathode were investigated. The XRD results indicate that the LLTO coating does not affect the structure of LiFePO4 and the LLTO-coated LiFePO4 cathode material still has olivine structure. The electrochemical measurements of LLTO-coated LiFePO4 show that the rate performance of LiFePO4 is greatly improved by the surface treatment. At the room temperature, LLTO-coated LiFePO4 exhibits high discharge capacity of 109.9 mAh g−1 at 10 C, whereas the uncoated LiFePO4 has the discharge capacity less than 80 mAh g−1 at the same rate. Besides, LLTO-coated LiFePO4 also shows better cycle stability and low-temperature performance than that of uncoated LiFePO4.