The recent progress of Li 2 FeSiO 4 as a poly‐anionic cathode material for lithium‐ion batteries

Currently, the poly-anionic Li2FeSiO4 material has become a research focus in the field of lithium-ion batteries due to the fact that it possesses excellent characteristics of high capacity, low cost of raw materials, the advantages of good security, and harmless to the environment. However, the Li2FeSiO4 also has many problems such as low conductivity, poor rate performance, worse cycling stability, slow diffusion of Li+ and so on, which limit its further development. Therefore, it is urgent for us to solve the synthesis of high-powered Li2FeSiO4 cathode materials. This paper first describes the structure and characteristics of Li2FeSiO4 material and then puts forward the method to realize the modification of Li2FeSiO4 cathode material according to its inherent defects. The effects of improving preparation methods, reducing material size, synthesizing composite materials, controlling morphology, interfering with external factors, doping of elements at different sites, and changing the element source for the properties of Li2FeSiO4 cathode materials are systematically discussed, and an outlook for the future was given.