Aqueous zinc-ion batteries(AZIBs)are one of the most promising sustainable energy storage technologies due to their safety,non-toxicity,and high theoretical capacity.Among the various AZIBs electrode materials,layered vanadium oxides are widely studied as cathode materials due to their advantages of adjustable crystal structure and high capacity.However,the slow electrochemical reaction kinetics and unstable layered structure caused by the small interlayer spacing and vanadium dissolution greatly hamper their commercialization progress.In this study,Ni0.22 V2O5·0.94 H2O(NiVO)materials were successfully prepared using a simple preintercalated strategy and it was used as cathode material for AZIBs.The preintercalation Ni2+and H2O not only expands the interlayer spacing but also act as interlayer pillars,effectively improving the zinc ion transport kinetics and the structural stability of the zinc ion insertion/extraction process.The results show that a high reversible specific capacity(307.4 mA·h/g)can be obtained at the current density of 0.2 A/g.Meanwhile,it exhibits excellent cycling stability,with a reversible specific capacity of 206.3 mA·h/g after 200 cycles at a current density of 2 A/g.This study provides a simple and feasible approach for the design and preparation of high-performance vanadium-based electrode materials.
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