Abstract
Hydroelectrochemical energy storage has the characteristics of high energy density, fast response time, low maintenance cost, flexible and convenient installation, etc., and is a hot development direction of future energy storage technology. Aqueous zinc-ion batteries (AZIBs) with neutral or near-neutral electrolytes have attracted much attention due to their advantages of safety, reliability, abundant resources, and environmental friendliness. Mn-based oxides are widely used as cathode materials for AZIBs due to their high theoretical specific capacity and low toxicity. However, Mn-based oxides face structural collapse during charge–discharge cycles, resulting in rapid capacity decay. This paper reviews the electrochemical characteristics of different Mn-based oxides as cathodes, the energy storage mechanism involved in the charging and discharging process of Mn-based AZIBs, and the advantages of Mn resources. At the same time, combined with the latest research progress, the existing problems and feasible improvement methods are pointed out, and the future development trend is prospected.
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