Abstract
Lithium ion batteries are considered to be one of the most promising energy storage materials because of their high energy density, high discharge capacity, long cycle life and safety. LiCoPO4 cathode material attracts lots of research interests due to high redox potential ( 4.8 V ) and high energy density ( 800 Wh/kg ). However, there are some shortcomings, such as, low electronic conductivity, low lithium ion conductivity, and the decomposition of electrolytes under high potentials, resulting in poor cyclic stability. LiCoPO4 particles were prepared by hydrothermal method. The syntheses were explored in two conditions: solvothermal process at 220 oC and supercritical fluid method at 400 oC. Fe3+ doping was also conducted in order to improve the electrical performance of LiCoPO4. LiCoPO4 particles prepared by supercritical fluid method were much smaller than those prepared by solvothermal method, which mainly have sheet structures. Although, poor electrochemical performance were obtained in this experiment due to non-optimized slurry forming processing, Fe3+ doping actually improved the discharge capacity slightly.