Challenges and Mechanisms of Electrolyte Additives for Lithium/Zinc Hybrid Ion Batteries: A Mini Review

Lithium/zinc (Li/Zn) hybrid ion batteries (HIBs) have garnered significant interest for their high energy density, safety, and low cost. However, their practical application is hindered by electrochemical incompatibility between the electrodes in a shared electrolyte, leading to dendrite growth, hydrogen evolution, metal dissolution, and structural degradation‐all compromising cycle life, efficiency, and safety. Electrolyte engineering, particularly functional additives, offers an effective and economical solution to these interfacial issues. This review summarizes recent advances in electrolyte additives for aqueous Li/Zn HIBs. It examines core challenges and highlights the role of additives in forming stable interphases to suppress side reactions, and in modulating cation solvation (Li + , Zn 2+ ) to improve deposition kinetics. The performance effects of representative additives are discussed, followed by an outlook on future research directions for designing high‐performance and cost‐effective electrolytes.