Li<sub>2</sub>SiO<sub>3</sub> Modification of C/LiFe<sub>0.5</sub>Mn<sub>0.5</sub>PO<sub>4</sub> for High Performance Lithium‐Ion Batteries
Xichang Liu, Baixue Ouyang, Rui Hao, Penggao Liu, Xiaowen Fan, Mengjie Zhang, Mengwei Pan, Weifang Liu, Kaiyu Liu
Abstract
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.