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Electrochemically Induced Metal–Organic‐Framework‐Derived Amorphous V 2 O 5 for Superior Rate Aqueous Zinc‐Ion Batteries
Author(s) -
Deng Shenzhen,
Yuan Zishun,
Tie Zhiwei,
Wang Changda,
Song Li,
Niu Zhiqiang
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202010287
Subject(s) - materials science , crystallinity , electrochemistry , amorphous solid , aqueous solution , metal organic framework , amorphous carbon , chemical engineering , cathode , carbon fibers , composite number , inorganic chemistry , composite material , electrode , chemistry , crystallography , adsorption , engineering
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.