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Abstract Rechargeable aqueous zinc‐ion batteries hold great promise for potential applications in large‐scale energy storage, but the reversible insertion of bivalent Zn 2+ and fast reaction kinetics remain elusive goals. Hence, a highly reversible Zn/VN x O y 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 (V 3+ ↔ V 2+ ) and anionic (N 3− ↔ N 2− ) redox reaction, which are mainly responsible for the high reversibility and no structural degradation of VN x O y . 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 Zn 2+ reaction kinetics for advanced aqueous zinc‐ion batteries.
Fang et al. (Tue,) studied this question.
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