High-Entropy Solid-State Electrolytes for Rechargeable Batteries: Mechanism, Structural Designs, Characterizations, and Applications.

Rechargeable batteries achieve remarkable advancements over the past few decades. Conventional electrolytes suffer from a range of challenges, such as low conductivity and poor thermal stability. Recent studies show that various properties of high-entropy solid-state electrolytes effectively solve these challenges. High-entropy solid-state electrolytes emerge as an effective strategy to enhance electrochemical performance. This review provides a comprehensive analysis of the fundamental principles, synthesis strategy, electrical performance characteristics, and applications of high-entropy solid-state electrolytes in electrochemical systems. Initially, this review discusses the mechanisms of the high-entropy solid-state electrolytes. Then, the optimization of high-entropy solid-state electrolytes is systematically introduced. The formation of single-phase structure improves the battery performance from multiple dimensions. Recent studies indicate that the high-entropy disorder can effectively enhance the ionic conductivity. A high-entropy approach promotes a uniform distribution of atoms within the material's lattice structure to improve the stability. The high-entropy solid-state electrolytes also mitigate some interfacial issues by the unique characteristics. Finally, this review summarizes the diverse applications of the high-entropy solid-state electrolytes. This review aims to offer a general overview of the current status and innovative thinking to support the future research of high-entropy solid-state electrolytes.