Data_Sheet_1_Polypyrrole Wrapped V2O5 Nanowires Composite for Advanced Aqueous Zinc-Ion Batteries.docx

Aqueous zinc-ion batteries (ZIBs) have obtained increasing attention owing to the high safety, material abundance, and environmental benignity. However, the development of cathode materials with high capacity and stable cyclability is still a challenge. Herein, the polypyrrole (PPy)-wrapped V2O5 nanowire (V2O5/PPy) composite was synthesized by a surface-initiated polymerization strategy, ascribing to the redox reaction between V2O5 and pyrrole. The introduction of PPy on the surface of V2O5 nanowires not only enhanced the electronic conductivity of the active materials but also reduced the V2O5 dissolution. As a result, the V2O5/PPy composite cathode exhibits a high specific capacity of 466 mAh g–1 at 0.1 A g–1 and a superior cycling stability with 95% capacity retention after 1000 cycles at a high current density of 5 A g–1. The superior electrochemical performance is ascribed to the large ratio of capacitive contribution (92% at 1 mV s–1) and a fast Zn2+ diffusion rate. This work presents a simple method for fabricating V2O5/PPy composite toward advanced ZIBs.水系锌离子电池（aqueous zinc-ion batteries, ZIBs）因其高安全性、原料储量丰富且环境友好性而受到越来越多的关注。然而，开发兼具高容量与稳定循环性能的正极材料仍是一项挑战。本文通过表面引发聚合法，利用五氧化二钒（V₂O₅）与吡咯（pyrrole）之间的氧化还原反应，合成了聚吡咯（polypyrrole, PPy）包覆的五氧化二钒纳米线（V₂O₅/PPy）复合材料。在五氧化二钒纳米线表面引入聚吡咯，不仅提升了活性材料的电子导电性，还抑制了五氧化二钒的溶解。结果表明，V₂O₅/PPy复合正极在0.1 A g⁻¹的电流密度下展现出466 mAh g⁻¹的高比容量，且在5 A g⁻¹的高电流密度下经过1000次循环后容量保持率仍达95%，具备优异的循环稳定性。该优异的电化学性能可归因于较高的电容贡献占比（在1 mV s⁻¹下为92%）以及较快的Zn²+扩散速率。本研究提供了一种简便的制备V₂O₅/PPy复合材料的方法，可用于开发高性能水系锌离子电池。