Li2SiO3 Modification of C/LiFe0.5Mn0.5PO4 for High Performance Lithium‐Ion Batteries

Abstract The carbon‐coated LiFe 0.5 Mn 0.5 PO 4 (C/LFMP) and carbon‐coated LiFe 0.5 Mn 0.5 PO 4 @Li 2 SiO 3 (C/LFMP‐LSO) could be successfully prepared by high temperature solid‐state reaction. Even though the crystal structure and morphology of C/LiFe 0.5 Mn 0.5 PO 4 was not changed by Li 2 SiO 3 coating, Li 2 SiO 3 modification was able to facilitate the diffusion of lithium ions, resulting in an excellent rate performance and cyclic stability of C/LFMP‐1LSO (1 wt %). The reversible discharge specific capacities of C/LFMP‐1LSO are 157.6 mAh g −1 and 106.3 mAh g −1 at 0.1C and 10C, respectively. Meanwhile, the C/LFMP‐1LSO was cycled for 500 times at 5C with a capacity retention rate of 85.3 %. Furthermore, at a low temperature of 6 °C and 0.2C, the C/LFMP‐1LSO displayed good low temperature performance with a discharge specific capacity of 140.6 mAh g −1 . Li 2 SiO 3 coating was considered an effective way to boost the overall electrochemical performance of C/LFMP.