Suppressing the dissolution of vanadium by organic-inorganic hybrid for aqueous zinc-ion batteries  

作　　者：Zexiang Luo Zhen Liu Hanbing He Zhihao Zhang Yong Chen Chaoqun Peng Jing Zeng 

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]School of Materials Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Journal of Materials Science & Technology》2023年第14期93-100,共8页材料科学技术（英文版）

基　　金：This work was financially supported by the China National Key R&D Program(No.2021YFB3701400);the Natural Science Foundation of Hunan Province,China(No.2022JJ40591);the Natural Sci-ence Foundation of Changsha,China(No.kq2202094);the Open Sharing Fund for the Large-scale Instruments and Equipment of Central South University and Postgraduate Innovative Project of Central South University.

摘　　要：Vanadium-based materials have been considered as the high promising cathodes for aqueous zinc ion batteries(ZIBs).Nevertheless,the dissolution of vanadium,the structural instability and the poor cy-cling stability largely hindered their applications.Metal organic frameworks(MOFs)and their deriva-tives attracted wide attention for their large specific surface area and structural tunability.Herein,MOFs derived·VO_(2)·Zn_(2)V_(2)O_(7)(MVHA)as organic-inorganic hybrids were constructed by the in-situ substitution method.The mixed valences of V 4+and V 5+between VO_(2)(B)and Zn_(2)V_(2)O_(7)were helpful to improve the electronic conductivity of MVHA cathode,and MOF-5-V acted as a physical barrier to inhibit the ca-thodic dissolution attributing to the particular organic frame structure.The obtained hybrid electrodes could deliver a high specific capacity(312.7 mA h g^(−1)at 1 A g^(−1)),and excellent long-term cycle stability(141.2 mA h g^(−1)after 1000 cycles at 10 A g^(−1)).Assistant density functional theory(DFT)calculations in-dicated that it has an ultra-low diffusion barrier of 0.32 eV for optimal Zn 2+diffusion path in MOF-5-V.The intriguing idea of in-situ compositing vanadium oxide and MOFs derived material opens up a new research direction for high-energy secondary batteries.

关 键 词：Vanadium dioxide MOF-5 Aqueous zinc ion batteries Hybrid materials DISSOLUTION 

分 类 号：TQ136.12[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]