V2O5 ⋅ nH2O and Graphene Oxide/CNTs Composite Film as Binder‐Free Cathode for Aqueous Zinc‐Ion Batteries

This study presents a facile approach to design a V₂O₅ ⋅ nH₂O, GO, and CNTs composite film (HVO/GO-CNTs) through freeze-drying and vacuum filtration. This binder-free cathode exhibits significant electrochemical performance, characterized by a high capacity of 387 mAh g⁻¹ at 0.2 A g⁻¹ and a high capacity retention rate of 82.6 % after 1000 cycles at 1 A g⁻¹.

Abstract

Emerging as a leading contender for economical, high-security grid-scale energy storage, rechargeable aqueous zinc-ion batteries (AZIBs) are currently facing the challenge in its progression due to the absence of cathode materials with high energy density. In this study, we design a V₂O₅ ⋅ nH₂O, GO and CNTs composite (HVO/GO-CNTs) film through freeze-drying and vacuum filtration. This binder-free cathode for AZIBs exhibits remarkable electrochemical performance, featuring a high capacity of 387 mAh g⁻¹ at 0.2 A g⁻¹ and a high capacity retention of 82.6 % after 1000 cycles at 1 A g⁻¹. This investigation offers a promising approach to electrode material design for the advancement of high-performance AZIBs.

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