The carbon‐coated LiFe0.5Mn0.5PO4 (C/LFMP) and carbon‐coated LiFe0.5Mn0.5PO4@Li2SiO3 (C/LFMP‐LSO) could be successfully prepared by high temperature solid‐state reaction. Even though the crystal structure and morphology of C/LiFe0.5Mn0.5PO4 was not changed by Li2SiO3 coating, Li2SiO3 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. Li2SiO3 coating was considered an effective way to boost the overall electrochemical performance of C/LFMP.
Sodium-ion batteries (SIBs) have been considered as promising replacements to lithium-ion batteries (LIBs) for large-scale energy storage applications. For anode materials, titanium dioxide (TiO 2 ) as a typical insertion-type anode material have been extensively investigated as a safety, stable, cheap and environmental-friendly anode materials for SIBs. Constructing suitable TiO 2 crystal structure is a common modification strategy for improving the diffusion kinetics of sodium ion within TiO 2 and its intrinsic electronic conductivity. Herein, a multi-atomic doped oxygen-deficient TiO 2 /C composites (N, S-NTC) was successfully synthesized with excellent electrochem-ical performance. Synergistic effect of N, S and Ni elements on the structure, morphology and electrochemical performance was investigated. Electron Paramagnetic Resonance (EPR) spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis indicated that the Ni, N, S doping can introduce oxygen deficiency, narrow the bandgap of TiO 2 and facilitating Na + diffusion, further providing higher electronic/ionic conductivities and faster electron transport channel. As a consequence, the anode materials delivered ultrahigh rate performance and cycling performance of a high reversible capacity of 128.6 mA h g À 1 at 1 A g À 1 after 3000th cycles.
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