Abstract
Aqueous zinc ion batteries (ZIBs) are of great concern for their low cost, high safety and eco-friendliness. Vanadium oxides are the underlying cathode materials for ZIBs because of their high theoretical capacity. However, the slow kinetics of multivalent charged Zn2+ in the host structure and unstable structure induce inferior cycling stability and rate performance. Herein, Mg2+ pre-intercalated V2O5·nH2O nanobelts derived from conductive V4C3 MXenes are devised and prepared as cathodes for ZIBs, delivering a high reversible capacity of 346 mAh g−1 at 0.1 A g−1 and preeminent ultra-long cycling stability with capacity retention of 83.7% after 10,000 cycles at 5 A g−1. Using this material as cathode, the soft-packed battery also represents favourable rate and cycling performance. The stable structure originated from pre-intercalated Mg2+ and interlayered water, splendid reversible phase transformation and high pseudocapacitive behavior boost the preeminent cycling stability and rate capacity.
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