Dendrite-free and anti-corrosion Zn metal anode enabled by an artificial layer for high-performance Zn ion capacitor  

作　　者：Zhuo Li Zhe Gong Xiaoyu Wu Ke Ye Jun Yan Guiling Wang Yingjin Wei Kai Zhu Jin Yi Dianxue Cao Guohua Chen 

机构地区：[1]College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China [2]Department of Mechanical Engineering,Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hong Kong,China [3]Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education),College of Physics,Jilin University,Changchun 130012,China [4]Institute for Sustainable Energy/College of Sciences,Shanghai University,Shanghai 200444,China

出　　处：《Chinese Chemical Letters》2022年第8期3936-3940,共5页中国化学快报（英文版）

基　　金：partially supported by Hong Kong Scholars Programs(No.XJ2019024);China Postdoctoral Science Foundation(Nos.2018M630340,2019T120254);Fundamental Research Funds for the Central Universities and National Natural Science Foundation of China(No.22075171)。

摘　　要：Aqueous zinc energy storage devices,holding various merits such as high specific capacity and low costs,have attracted extensive attention in recent years.Nevertheless,Zn metal anodes still suffer from a short lifespan and low Coulombic efficiency due to corrosion and side reactions in aqueous electrolytes.In this paper,we construct an artificial Sn inorganic layer on Zn metal anode through a facile strategy of atom exchange.The Sn layer suppresses Zn dendrite growth by facilitating homogeneous Zn plating and stripping during charge and discharge processes.Meanwhile,the Sn protective layer also serves as a physical barrier to decrease Zn corrosion and hydrogen generation.As a result,The Sn-coated anode(Sn|Zn)exhibits a low polarization voltage(~34 mV at 0.5 mAh/cm^(2))after 800 testing hours and displays a smooth and an even surface without corrosion.Moreover,the zinc ion capacitor(Sn|Zn‖activated carbon)is assembled with an enhanced capacity of 42 mAh/g and a capacity retention of 95%after 10,000 cycles at 5 A/g.This work demonstrates a feasible approach for the commercialization of aqueous Zn-based energy storage devices.

关 键 词：Zn ion capacitor Aqueous electrolyte Surface structure Sn metal layer ANTI-CORROSION 

分 类 号：TM53[电气工程—电器] TG174.4[金属学及工艺—金属表面处理]