Superior plating/stripping performance through constructing an artificial interphase layer on metallic Mg anode  

作　　者：Bangpeng Yang Liuyan Xia Rong Li Guangsheng Huang Shuangshuang Tan Zhongting Wang Baihua Qu Jingfeng Wang Fusheng Pan 

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]National Engineering Research Center for Magnesium Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

出　　处：《Journal of Materials Science & Technology》2023年第26期154-162,共9页材料科学技术（英文版）

基　　金：financially supported by the Fundamental Re-search Funds for the Central Universities(No.2021CDJXDJH003);the Chongqing Technology Innovation and Application Devel-opment Project(No.CSTB2022TIAD-KPX0028).

摘　　要：Rechargeable magnesium batteries(RMBs)have attracted tremendous attention in energy storage ap-plications in term of high abundance,high specific capacity and remarkable safety of metallic magne-sium(Mg)anode.However,a serious passivation of Mg anode in the conventional electrolytes leads to extremely poor plating/stripping performance,further hindering its applications.Herein,we propose a convenient method to construct an artificial interphase layer on Mg anode by substitution and alloy-ing reactions between SbCl_(3) and Mg.This Sb-based artificial interphase layer containing mainly MgCl_(2) and Mg_(3) Sb_(2) endows the significantly improved interfacial kinetics and electrochemical performance of Mg anode.The overpotential of Mg plating/stripping in conventional Mg(TFSI)2/DME electrolytes is vastly reduced from over 2 V to 0.25-0.3 V.Combining experiments and calculations,we demonstrate that un-der the uniform distribution of MgCl_(2) and Mg_(3) Sb_(2),an electric field with a favorable potential gradient is formed on the anode surface,which enables swift Mg^(2+)migration.Meanwhile,this layer can inhibit the decomposition of electrolytes to protect anode.This work provides an in-depth exploration of the artificial solid-electrolyte interface(SEI)construction,and a more achievable and safe path to realize the application of metallic Mg anode in RMBs.

关 键 词：Rechargeable magnesium batteries Metallic Mg anode Artificial solid-electrolyte interface Interfacial modification Anode protection 

分 类 号：TM912[电气工程—电力电子与电力传动]