Preparation and electrochemical properties of LiFePO4/C-Li4Ti5O12 composites

Abstract

LiFePO4/C-Li4Ti5O12 composite electrode materials were synthesized by blending LiFePO4/C and Li4Ti5O12 materials then calcining at 500 °C for 14 h. The effects of different composite ratios on the phase structure and electrochemical properties of LiFePO4/C-Li4Ti5O12 composite cathode materials were investigated. The results showed that the structure of LiFePO4/C and Li4Ti5O12 in the composite prepared by the simple blending method did not change. XRD shows only the characteristic peaks of these two substances and no characteristic peaks of other crystal impurities. When the recombination ratio was 8:2 (LPF-8), the obtained composite material had fine particles and uniform size. The initial discharge capacity at 0.1C rate is 151.56 mAh g−1 at the voltage of 1.0–4.2 V. After 100 cycles, the capacity retention rate was 97.3% which exhibited more outstanding electrochemical performance than samples with other composite ratios.