Abstract: Sodium-ion batteries have emerged as a crucial option for next-generation energy storage systems owing to their cost advantage. However, this system still confronts numerous challenges, such as poor cycle stability, phase transitions, and structural degradation. Among various modification methods, the high-entropy strategy exhibits remarkable advantages due to its unique compositional and structural characteristics. Researchers have gradually applied the high-entropy strategy to sodium-ion battery materials to enhance their electrochemical performance. Focusing on three types of cathode materials—layered transition metal oxides, polyanionic compounds, and Prussian blue analogs—this paper reviews the positive impacts of the high-entropy strategy on material structural stability, phase transition suppression, and ion diffusion kinetics. It also summarizes the current application status and key challenges of high-entropy materials in sodium-ion batteries, and puts forward prospects for future research directions.

Key words: sodium-ion battery, high-entropy strategy, Na superionic conductor, layered transition metal oxides, polyanionic compounds, Prussian blue analogs