Interface Synthesis of FePO4 with Different Morphologies and Effect of Morphology on the Electrochemical Performance of LiFePO4/C

摘要

In our work, interface synthesis method was put forward to prepare FePO₄ with different morphologies, and theeffect of morphology on the preparation and electrochemical performance of LiFePO₄/C was investigated. Theresults showed that the morphology of FePO₄ was amorphous and monoclinic at the treatment temperatures of30 °C and 80 °C, respectively. LiFePO₄/C prepared from two crystal precursors were both hemispherical hollowwith an olivine crystal structure. LiFePO₄/C produced from the monoclinic structured precursor exhibited smaller-sized morphology and better electrochemical performance, and its discharge capacities were 155.9 mA h g?1and 141.8 mA h g?1 at the rates of 0.1 C and 1 C, respectively. After 150 cycles, its capacity retention was about97.8 % and 95.1 % at 0.1 C and 1 C, respectively.