Mg-Doped Li2FeTiO4 as a High-Performance Cathode Material Enabling Fast and Stable Li-ion Storage

As a multi-electron system material, the excellent capacity and environmentally benign properties of Li2FeTiO4 cathodes make them attractive for lithium-ion batteries. Nevertheless, their electrochemical performance has been hampered by poor conductivity and limited ion transport. In this work, the synthesis of Mg-doped Li2MgxFe1−xTiO4 (LiFT-Mgx, x = 0, 0.01, 0.03, 0.05) cathode materials was successfully achieved. We observed significant gains in interlayer spacing, ionic conductivity, and kinetics. Hence, the sample of the LiFT-Mg0.03 cathode demonstrated charming initial capacity (112.1 mAh g−1, 0.05 C), stability (85.0%, 30 cycles), and rate capability (96.5 mAh g−1, 85.9%). This research provided precious insights into lithium storage with exceptional long-term stability and has the potential to drive the development of next-generation energy storage technologies.