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Boosted Charge Transfer in Twinborn α‑(Mn2O3–MnO2) Heterostructures: Toward High-Rate and Ultralong-Life Zinc-Ion Batteries

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journal contribution
posted on 08.07.2020 by Jun Long, Fuhua Yang, Jing Cuan, Jingxing Wu, Zhanhong Yang, Hao Jiang, Rui Song, Wenlong Song, Jianfeng Mao, Zaiping Guo
Aqueous ZIBs are one of the most promising next-generation rechargeable batteries because of the high capacity, high hydrogen evolution overpotential, and chemically stable reversible plating/stripping of the zinc electrode in the mild aqueous electrolyte. However, there are limited cathode materials that can store Zn2+ reversibly with superior cycling and rate capability. Herein, hierarchically porous nanorods composed of twinborn α-(Mn2O3–MnO2) heterostructures are proposed as a robust cathode for Zn storage. Thanks to the hierarchically porous nanorod morphology and the abundant interface of the heterostructures involving a built-in electric field, the as-obtained twinborn α-(Mn2O3–MnO2) electrode delivers a high capacity of 170 mA h g–1 for 2000 cycles at 500 mA g–1 and shows an excellent rate capability of up to 1.5 A g–1 with a capacity of 124 mA h g–1. The inspiring results achieved exhibit the enormous potential of the high-performance heterostructure cathode for fast and stable ZIBs.