Review—Research Progress of Li2FeSiO4 Cathode Materials for Lithium-Ion Batteries

Li 2 FeSiO 4 , as a highly promising polyanionic cathode material, has the advantages of high energy density, low cost, good thermal stability, high safety and environmental friendliness. However, its electrochemical performance has been affected by the drawbacks such as low electrical conductivity, low Li-ion diffusion rate and crystal instability. Over the years, in order to solve these problems and truly realize the commercial application of Li 2 FeSiO 4 cathode materials, researchers have proposed more and more preparation or modification methods to optimize the electrochemical performance of Li 2 FeSiO 4 . This paper lists the electrochemical performance improvement of modified Li 2 FeSiO 4 and its innovation points. The realistic problems that still exist in the application of Li 2 FeSiO 4 cathode materials at this stage were discussed. This paper provides a basis for the next innovative research and application of cathode materials for Li-ion batteries.