High area-capacity Mg batteries enabled by sulfur/copper integrated cathode design

作     者：Zhenfang Zhou Aobing Du Weijie Kong Zhuang Chen Zhonghua Zhang Bingbing Chen Yitao He Shanmu Dong Zhenjiang Li Guicun Li Guanglei Cui Zhenfang Zhou;Aobing Du;Weijie Kong;Zhuang Chen;Zhonghua Zhang;Bingbing Chen;Yitao He;Shanmu Dong;Zhenjiang Li;Guicun Li;Guanglei Cui

作者机构：College of Materials Science and EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101ShandongChina Department of Energy Science and EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina Department of PhysicsHarbin Institute of TechnologyHarbin 150001HeilongjiangChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第9期

页      面：370-378,I0011页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(21805157,51972187) the Project funded by China Postdoctoral Science Foundation(2021M701817) the Natural Science Foundation of Shandong Provincial(ZR2021QE166) the National Natural Science Foundation for Distinguished Young Scholars of China(51625204) the Major Basic Research Program of Natural Science Foundation of Shandong Province(ZR2020ZD09)。 

主　　题：Magnesium batteries Sulfur cathode Displacement reaction Copper sulfides 

摘      要：Rechargeable Mg batteries potentially display lower cost and competitive energy density compared with their Li-ion counterparts.However,the practical implementation of high area-capacity cathodes still remains a formidably challenging task.This work presents the sulfur/copper integrated cathodes fabricated by the conventional blade-coating process and slurry-dipping method.The sulfur/copper foil integrated cathodes deliver a high area-capacity of 2.6 mAh cm^(-2)after 40 cycles,while the sulfur/copperfoam integrated cathode exhibits an ultrahigh area-capacity of 35.4 mAh cm^(-2),corresponding to 743.1 Wh L^(-1)at the electrode level(1.5 times higher than the LiCoO_(2)-graphite system).The in-situ formed copper sulfide intermediates with sufficient cation defects can act as functional intermediates to regulate the sulfur electrochemistry during the first discharge process.The subsequent cycles are operated by the reversible displacement reaction between Mg-ions and copper sulfide active substances.In particular,the copper ions prefer to extrude along the[001]direction in copper sulfides lattice and simultaneously the rock-salt MgS crystals are generated.Besides,the nonuniform surface topography of the cycled Mgmetal anode,caused by the spatial inhomogeneity in current distribution,is demonstrated to lead to the battery performance degradation for high area-capacity Mg batteries.