Research progress of high-entropy cathode materials for sodium-ion batteries

In recent years, sodium-ion batteries (SIBs) have become one of the hot discussions and have gradually moved toward industrialization. However, there are still some shortcomings in their performance that have not been well addressed, including phase transition, structural degradation, and voltage platform. High entropy materials have recently gained significant attention from researchers due to their effects on thermodynamics, dynamics, structure, and performance. Researchers have attempted to use these materials in sodium-ion batteries to overcome their problems, making it a modification method. This paper aims to discuss the research status of high-entropy cathode materials for sodium-ion batteries and summarize their effects on sodium-ion batteries from three perspectives: Layered oxide, polyanion, and Prussian blue. The influence on material structure, the inhibition of phase transition, and the improvement of ion diffusivity are described. Finally, the advantages and disadvantages of high-entropy cathode materials for sodium-ion batteries are summarized, and their future development has prospected.