Transient Performance Enhancement of Layered K x MnO 2 Cathodes for Zinc‐Ion Batteries via Cu Doping

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Layered manganese oxides are considered state‐of‐the‐art cathode materials for aqueous rechargeable zinc‐ion batteries (ZIBs) owing to their low cost, natural abundance, and viability for Zn 2+ intercalation. However, challenges of limited capacity, rate capability, and durability need to be addressed in order for commercial uptake of ZIBs to become a reality. In this study, we investigate the use of Cu as a redox‐active dopant to improve the electrochemical performance of a layered manganese oxide cathode. Through a facile synthesis method, we prepared K 0.3 Mn 0.95 Cu 0.05 O 2 , which delivered an elevated capacity of >215 mAh g −1 owing to both the redox activity of Cu at low voltages (<1.0 V vs. Zn/Zn 2+ ) and a reduced charge transfer resistance observed in the Cu doped material. However, the capacity gained from the redox‐active Cu displayed partial irreversibility upon repeated cycling, leading to a rapid loss of capacity contributions from Cu after 50 cycles. This work highlights the benefits of Cu doping as a strategy for enhancing the capacity and rate capability of manganese oxide cathodes, while openly discussing its current limitations, including a lack of durability of this enhanced performance owing to the irreversibility of the Cu redox activity within the system.

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