High-entropy electrolytes towards advanced aqueous zinc-ion batteries

Abstract

Aqueous zinc-ion batteries (AZIBs) hold great promise for safe and sustainable grid-scale energy storage, yet the interfacial instability of the zinc metal anode hampers their practical deployment. The emerging concept of high-entropy electrolytes (HEEs) offers novel opportunities to tackle this challenge. The diverse solvation environments in HEEs have been shown to transcend the limitations of conventional electrolyte engineering frameworks and enhance performance in non-aqueous systems. While HEEs have also shown early promise in AZIBs, translating this design principle requires a fundamental understanding of the unique physicochemical properties and constraints of aqueous electrolytes. In this perspective, we delineate the working mechanisms of HEEs for AZIBs by integrating insights from non-aqueous HEEs with the distinctive characteristics of aqueous electrolytes. Furthermore, we diagnose the persistent challenges hindering the development of HEEs for AZIBs and propose strategic pathways to accelerate their rational design. By establishing a robust theoretical foundation and bridging the gap with practical research, we offer a blueprint to guide future efforts toward unlocking the full potential of AZIBs.