Abstract: Rechargeable room-temperature sodium-sulfur (Na-S) and sodium-selenium (Na-Se) batteries are gaining extensive attention for potential large-scale energy storage applications owing to their low cost and high theoretical energy density. Optimization of electrode materials and investigation of mechanisms are essential to achieve high energy density and long-term cycling stability of Na-S(Se) batteries. Herein, we provide a comprehensive review of the recent progress in Na-S(Se) batteries. We elucidate the Na storage mechanisms and improvement strategies for battery performance. In particular, we discuss the advances in the development of battery components, including high-performance sulfur cathodes, optimized electrolytes, advanced Na metal anodes and modified separators. Combined with current research achievements, this review outlines remaining challenges and clear research directions for the future development of practical high-performance Na-S(Se) batteries.

Key words: Sodium-sulfur batteries, Sodium-selenium batteries, Sulfur cathodes, Electrolyte engineering, Solid-state electrolytes, Sodium metal anodes