Rechargeable zinc‐ion batteries (ZIBs) are emerging as a promising alternative for Li‐ion batteries. However, the developed cathodes suffer from sluggish Zn²⁺ diffusion kinetics, leading to poor rate capability and inadequate cycle life. Herein, an in situ polyaniline (PANI) intercalation strategy is developed to facilitate the Zn²⁺ (de)intercalation kinetics in V₂O₅. In this way, a remarkably enlarged interlayer distance (13.90 Å) can be constructed alternatively between the VO layers, offering expediting channels for facile Zn²⁺ diffusion. Importantly, the electrostatic interactions between the Zn²⁺ and the host O²⁻, which is another key factor in hindering the Zn²⁺ diffusion kinetics, can be effectively blocked by the unique π‐conjugated structure of PANI. As a result, the PANI‐intercalated V₂O₅ exhibits a stable and highly reversible electrochemical reaction during repetitive Zn²⁺ insertion and extraction, as demonstrated by in situ synchrotron X‐ray diffraction and Raman studies. Further first‐principles calculations clearly reveal a remarkably lowered binding energy between Zn²⁺ and host O²⁻, which explains the favorable kinetics in PANI‐intercalated V₂O₅. Benefitting from the above, the overall electrochemical performance of PANI‐intercalated V₂O₅ electrode is remarkable improved, exhibiting excellent high rate capability of 197.1 mAh g⁻¹ at current density of 20 A g⁻¹ with capacity retention of 97.6% over 2000 cycles.

中文翻译：

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通过原位聚苯胺插层来调节V2 O5中锌离子插入/萃取的动力学，可以改善水性锌离子存储性能。

可充电锌离子电池（ZIB）逐渐成为锂离子电池的有前途的替代品。然而，已开发的阴极具有缓慢的Zn ²⁺扩散动力学，导致差的速率能力和不足的循环寿命。本文中，开发了一种原位聚苯胺（PANI）嵌入策略，以促进V ₂ O _5中Zn ²⁺（de）嵌入动力学。这样，可以交替在V theO层之间构造一个显着增大的层间距离（13.90Å），从而为方便的Zn ²⁺扩散提供了加速通道。重要的是，Zn ²⁺与主体O ²⁻之间的静电相互作用，这是阻碍Zn ²⁺扩散动力学的另一个关键因素，可以通过PANI独特的π共轭结构有效地阻止。结果，PANI插层的V ₂ O ₅在重复Zn ^2+的插入和萃取过程中表现出稳定且高度可逆的电化学反应，如原位同步加速器X射线衍射和拉曼研究所示。进一步的第一性原理计算清楚地表明了Zn ²⁺与主体O ²⁻之间的结合能显着降低，这解释了PANI嵌入V ₂ O _5中的有利动力学。。得益于以上所述，PANI插层的V ₂ O ₅电极的整体电化学性能得到了显着改善，在20 A g ^-1的电流密度下表现出出色的高倍率容量197.1 mAh g ^-1，在2000年内的容量保持率为97.6％。周期。