水溶液
结晶度
电化学
无定形固体
金属有机骨架
化学工程
无定形碳
化学
阴极
无机化学
碳纤维
扩散
复合数
材料科学
复合材料
电极
结晶学
有机化学
物理化学
吸附
工程类
物理
热力学
作者
Shenzhen Deng,Zishun Yuan,Zhiwei Tie,Changda Wang,Li Song,Zhiqiang Niu
标识
DOI:10.1002/anie.202010287
摘要
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.
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