Finally, some future perspectives towards the development of the separators in AZBs are put forward. Then, the strategies for settling the challenges of AZBs utilizing functional separators are discussed and summarized.

Based on this, the advantages and existing challenges of AZBs are firstly discussed. To realize an insightful and comprehensive understanding of the roles of the separator in AZBs, it is necessary to discuss and categorize the working mechanism of the separator. As the indispensable part in batteries, the separator could control the cation/anion transport and it is one ideal candidate for regulating the ion transport properties. The above issues are highly related with the ion transport properties in AZBs. iodine cathode) hinder the practical and large-scale applications of AZBs. Nevertheless, some critical issues such as the zinc dendrite formation in the anode side as well as the shuttle effect of some typical cathode materials (i.e. Aqueous zinc batteries (AZBs) with high safety, low cost, ample resources and environmental benignity are considered as one promising candidate of next-generation energy-storage devices.

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