Simultaneous Cationic and Anionic Redox Reactions Mechanism Enabling High‐Rate Long‐Life Aqueous Zinc‐Ion Battery

By Guozhao Fang, S. Liang, Zixian Chen, P. Cui, Xusheng Zheng, Anqiang Pan, Bingan Lu, Xihong Lu, Jiang Zhou. Advanced Functional Materials, 2019

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Rechargeable aqueous zinc‐ion batteries hold great promise for potential applications in large‐scale energy storage, but the reversible insertion of bivalent Zn2+ and fast reaction kinetics remain elusive goals. Hence, a highly reversible Zn/VNx Oy battery is developed, which combines the insertion/extraction reaction and pseudo‐capacitance‐liked surface redox reaction mechanism. The energy storage is induced by a simultaneous reversible cationic (V3+ ↔ V2+) and anionic (N3− ↔ N2−) redox reaction, which are mainly responsible for the high reversibility and no structural degradation of VNxOy. As expected, a superior rate capability of 200 mA h g−1 at 30 A g−1 and high cycling stability up to 2000 cycles are achieved. This finding opens new opportunities for the design of high‐performance cathodes with fast Zn2+ reaction kinetics for advanced aqueous zinc‐ion batteries.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/fa19a74f440a2c3120b418509aa5c07c001a30c1