Recent Advances on Cathode Materials for Sodium-Ion Batteries

Sodium-ion batteries, owing to their advantages such as abundant sodium resources and low cost, have emerged as one of the most promising next-generation technologies for large-scale electrochemical energy storage. The cathode material plays a critical role in determining both energy density and cycle life. Currently research efforts are primarily focuses on three systems: layered oxides, Prussian blue analogues, and polyanion compounds. This review systematically summarizes the mechanism of three cathode materials in the sodium-ion battery, latest research progress in modification strategies such as element doping, interface modification, high-entropy design, and bottleneck problems of these cathode materials, aiming to provide perspectives on future development directions.