On-site building of a Zn^(2+)-conductive interfacial layer via short-circuit energization for stable Zn anode  

自发短路反应原位构筑锌离子传导界面层稳定锌负极

作　　者：Ping Xiao Lanlan Xue Yanpeng Guo Lintong Hu Can Cui Huiqiao Li Tianyou Zhai 肖娉;薛澜澜;郭雁鹏;胡林童;崔灿;李会巧;翟天佑(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University,Tianjin 300071,China)

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University,Tianjin 300071,China

出　　处：《Science Bulletin》2021年第6期545-552,M0003,共9页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation(51772115);the National Key Research and Development Program of China(2018YFE0206900);the Hubei Provincial Natural Science Foundation(2019CFA002)。

摘　　要：Aqueous zinc ion batteries(ZIBs)show great potential in large-scale energy storage systems for their advantages of high safety,low cost,high capacity,and environmental friendliness.However,the poor performance of Zn metal anode seriously hinders the application of ZIBs.Herein,we use the zinc-ion intercalatable V_(2)O_(5)nH_(2)O(VO)as the interface modification material,for the first time,to on-site build a Zn^(2+)-conductive ZnxV_(2)O_(5)nH_(2)O(ZnVO)interfacial layer via the spontaneous short-circuit reaction between the pre-fabricated VO film and Zn metal foil.Compared with the bare Zn,the ZnVO-coated Zn anode exhibits better electrochemical performances with dendrite-free Zn deposits,lower polarization,higher coulombic efficiency over 99%after long cycles and 10 times higher cycle life,which is confirmed by constructing Zn symmetrical cell and Zn|ZnSO_(4)+Li_(2)SO_(4)|LiFePO_(4) full cell.水系锌离子电池具有高安全性、大容量、低成本、环境友好等优点,在大型储能系统中显示出巨大的潜力.然而,金属锌负极上枝晶的生长、析氢腐蚀、钝化等问题严重阻碍了锌离子电池的应用.在锌负极表面构筑一层界面层被证明是一种简单有效的方法.目前已经报道的无机界面涂层材料如纳米Ca CO_(3)、无定形Ti O_(2)等,主要通过物理作用机械阻隔枝晶,但这些材料本身不具有锌离子的导电性,无法化学调控锌离子的传输.本文采用ZnxV_(2)O_(5)·n H_(2)O(Zn VO)作为界面改性材料,将锌离子电池常用的正极材料层状钒氧化物应用于锌负极的界面保护,通过V_(2)O_(5)·n H_(2)O与金属锌之间的自发短路反应,在锌负极表面上原位构建了Zn VO材料的锌离子导电界面层.与无修饰的锌负极相比,Zn VO涂覆后的锌负极,在减少电解液与锌负极直接接触的同时引导锌离子的传输,表现出更好的电化学性能.其中,锌对称电池的循环寿命提高了10倍以上.

关 键 词：V_(2)O_(5) Interfacial layer On-site building Zn anode Zinc ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ132.41[化学工程—无机化工]