zinc ion

zinc-ion batteries

aqueous zinc

vanadium oxide

specific capacity

quasi solid

air batteries

Chemical Engineering Journal

• Cs + ion intercalated V 2 O 5 cathode material was developed for aqueous zinc-ion batteries. • Cs + played a “pillar” role and formed a strong Cs-O chemical bond simultaneously. • Excellent rate capability and cycling stability were achieved. Layered vanadium oxide cathode materials have attracted extensive attentions in rechargeable aqueous zinc-ion batteries (ZIBs) owing to its large interlayer distance and high capacity. Unfortunately, it suffers from fast capacity decay during long-term cycle due to severe structural collapse. Herein, we intercalate cesium ion (Cs + ) into hydrated vanadium pentoxide (V 2 O 5 ·nH 2 O) to obtain a reinforce layered structure, which forms strong Cs-O bond with the built-in oxygen atom and enhances the interaction between the layers to avoid the structure collapse. As a result, the Cs + intercalated material (CsVO) presents an enhanced specific capacity (404.9 mAh g −1 at current density of 0.1 A g −1 , 189.9 mAh g −1 at 20 A g −1 ) and excellent long-term cycle stability (the capacity retention of 89% over 10,000 cycles even at 20 A g −1 ), that is obviously superior to the bare V 2 O 5 ·nH 2 O electrode. Furthermore, Zn 2+ /H + co-insertion mechanism in aqueous ZIBs is demonstrated by ex-situ XRD and XPS characterizations.

Towards high-performance aqueous zinc-ion battery via cesium ion intercalated vanadium oxide nanorods