Electrochemically Induced Metal–Organic‐Framework‐Derived Amorphous V 2 O 5 for Superior Rate Aqueous Zinc‐Ion Batteries

作者：Shenzhen Deng, Zishun Yuan, Zhiwei Tie, Changda Wang, Li Song, Zhiqiang Niu · 发表于：Angewandte Chemie International Edition · 年份：2020 · DOI：10.1002/anie.202010287 · 被引用次数：504 · 研究领域：Advanced battery technologies research、Advanced Battery Materials and Technologies、Advancements in Battery Materials

Abstract The electrochemical performance of vanadium‐oxide‐based cathodes in aqueous zinc‐ion batteries (ZIBs) depends on their degree of crystallinity and composite state with carbon materials. An in situ electrochemical induction strategy was developed to fabricate a metal–organic‐framework‐derived composite of amorphous V 2 O 5 and carbon materials (a‐V 2 O 5 @C) for the first time, where V 2 O 5 is in an amorphous state and uniformly distributed in the carbon framework. The amorphous structure endows V 2 O 5 with more isotropic Zn 2+ diffusion routes and active sites, resulting in fast Zn 2+ transport and high specific capacity. The porous carbon framework provides a continuous electron transport pathway and ion diffusion channels. As a result, the a‐V 2 O 5 @C composites display extraordinary electrochemical performance. This work will pave the way toward design of ZIB cathodes with superior rate performance.