Lithium-ion batteries(LIBs)are excellent electro-chemical energy sources,albeit with existing challenges,including high costs and safety concerns.Magnesium-ion batteries(MIBs)are one of the potential alternatives.However,the performance of MIBs is poor due to their sluggish solid-state Mg2+diffusion kinetics and severe electrode polarizability.Rechargeable magnesium-ion/lithium-ion(Mg2+/Li+)hybrid batteries(MLHBs)with Mg2+and Li+as the charge carriers create a synergy between LIBs and MIBs with signifi-cantly improved charge transport kinetics and reliable safety features.However,MLHBs are yet to reach a reasonable electrochemical performance as expected.This work reports a composite electrode material with highly defective two-dimensional(2D)tin sulphide nanosheets(SnSx)encapsulated in three-dimensional(3D)holey graphene foams(HGF)(SnSx/HGF),which exhibits a specific capacity as high as 600 mAh g-1 at 50 mA g-1 and a compelling specific energy density of～330 Wh kg-1.The excellent electrochemical performance surpasses previously reported hybrid battery systems based on intercalation-type cathode materials under comparable conditions.The role played by the defects in the SnSx/HGF composite is studied to understand the origin of the observed excellent electrochemical performance.It is found that it is closely related to the defect structure in SnSx,which offers percolation pathways for efficient ion transport and increased internal surface area assessable to the charge carriers.The defective sites also absorb structural stress caused by Mg2+and Li+insertion.This work is an important step towards realizing high-capacity cathode materials with fast charge transport kinetics for hybrid batteries.

Xin Fan;Mike Tebyetekerwa;Yilan Wu;Rohit Ranganathan Gaddam;Xiu Song Zhao

School of Chemical Engineering,The University of Queensland,St Lucia,Brisbane,QLD 4072,Australia;School of Material Science and Technology,North University of China,Taiyuan 030051,Shanxi,People's Republic of China;Dow Centre for Sustainable Engineering Innovation,School of Chemical Engineering,The University of Queensland,St Lucia,Brisbane,QLD 4072,Australia;Department of Chemical Engineering,Indian Institute of Science Education and Research,Bhopal,India

纳微快报（英文）

[1]Xin Fan;Mike Tebyetekerwa;Yilan Wu;Rohit Ranganathan Gaddam;Xiu Song Zhao-.Origin of Excellent Charge Storage Properties of Defective Tin Disulphide in Magnesium/Lithium-Ion Hybrid Batteries)[J].纳微快报（英文）,2022(11):87-106

Disulphide,Mg2+diffusion,MLHBs,Li+as,SnSx,assessable

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