Rechargeable aqueous magnesium-ion batteries(MIBs)show great promise for low-cost,high-safety,and high-performance energy storage applications.Although manganese dioxide(MnO2)is considered as a potential electrode material for aqueous MIBs,the low electrical conductivity and unsatisfactory cycling performance greatly hinder the practical application of MnO2 electrode.To overcome these problems,herein,a novel Mg-intercalation engineering approach for MnO2 electrode to be used in aqueous MIBs is presented,wherein the structural reg-ulation and electrochemical performance of the Mg-intercalation MnO2(denoted as MMO)electrode were thoroughly investigated by density functional theory(DFT)calculations and in-situ Raman investigation.The results demonstrate that the Mg intercalation is essential to adjusting the charge/ion state and electronic band gap of MMO electrode,as well as the highly reversible phase transition of the MMO electrode during the charging-discharging process.Because of these remarkable characteristics,the MMO electrode can be capable of delivering a significant specific capacity of～419.8 mAh·g-1,while exhibiting a good cycling capability over 1000 cycles in 1 M aqueous MgCl2 electrolyte.On the basis of such MMO electrode,we have successfully developed a soft-packaging aqueous MIB with excellent electrochemical properties,re-vealing its huge application potential as the efficient energy storage devices.

Yue Zhao;Bei Wang;Minjie Shi;Shibo An;Liping Zhao;Chao Yan

School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;State Key Laboratory for Metallic Matrix Composite Materials,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

矿物冶金与材料学报

[1]Yue Zhao;Bei Wang;Minjie Shi;Shibo An;Liping Zhao;Chao Yan-.Mg-intercalation engineering of MnO2 electrode for high-performance aqueous magnesium-ion batteries)[J].矿物冶金与材料学报,2022(11):1954-1962

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