【摘 要】
：
Aqueous zinc-ion batteries (ZIBs) have attracted great attention as the candidates for large-scale energy storage system,recently,because of their low cost,environment-friendly,high safety,and high theoret-ical energy densities.Among the numerous cathode
【机 构】
：
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education),Renewable Energy Conve
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Aqueous zinc-ion batteries (ZIBs) have attracted great attention as the candidates for large-scale energy storage system,recently,because of their low cost,environment-friendly,high safety,and high theoret-ical energy densities.Among the numerous cathode materials,layered structure vanadium based polyan-ionic compounds,such as VOPO4,exhibit high specific capacity for Zn ion storage.However,the low Zn ion diffusion coefficient and limited interlayer spacing make the cathodes low reversible capacity and inferior cycling stability.Herein,K ions were pre-intercalated into the VOPO4 layers via ions exchange adopting VOPO4·2H2O as the precursor.When evaluated as the cathode for ZIBs,an excellent cycle sta-bility of 400 cycles under a current density of 500 mA g-1 was achieved by the obtained KVOPO4 elec-trode,verifying the positive effect of intercalation engineering.Furtherly,a solid-solution reaction Zn ion storage mechanism was confirmed.This study provides a new insight to explore high performance cathode materials for ZIBs.
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