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Origin of Excellent Charge Storage Properties of Defective tin disulphide in Magnesium/Lithium-Ion Hybrid Batteries

Nano-Micro Letters 2022年第11期14卷 87-106页

作者： Xin Fan Mike Tebyetekerwa Yilan Wu Rohit Ranganathan Gaddam Xiu Song Zhao School of Chemical Engineering The University of QueenslandSt LuciaBrisbaneQLD 4072Australia School of Material Science and Technology North University of ChinaTaiyuan 030051ShanxiPeople’s Republic of China Dow Centre for Sustainable Engineering Innovation School of Chemical EngineeringThe University of QueenslandSt LuciaBrisbaneQLD 4072Australia Department of Chemical Engineering Indian Institute of Science Education and ResearchBhopalIndia

Lithium-ion batteries(LIBs)are excellent electrochemical energy sources,albeit with existing challenges,including high costs and safety ***-ion batteries(MIBs)are one of the potential ***,the performance of MIBs is poor due to their sluggish solid-state Mg^(2+) diffusion kinetics and severe electrode *** magnesium-ion/lithium-ion(Mg^(2+)/Li^(+))hybrid batteries(MLHBs)with Mg^(2+) and Li+as the charge carriers create a synergy between LIBs and MIBs with significantly improved charge transport kinetics and reliable safety ***,MLHBs are yet to reach a reasonable electrochemical performance as *** work reports a composite electrode material with highly defective two-dimensional(2D)tin sulphide nanosheets(SnS_(x))encapsulated in three-dimensional(3D)holey graphene foams(HGF)(SnS_(x)/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 *** role played by the defects in the SnS_(x)/HGF composite is studied to understand the origin of the observed excellent electrochemical *** is found that it is closely related to the defect structure in SnS_(x),which offers percolation pathways for efficient ion transport and increased internal surface area assessable to the charge *** defective sites also absorb structural stress caused by Mg^(2+) and Li+*** work is an important step towards realizing high-capacity cathode materials with fast charge transport kinetics for hybrid batteries.

关键词： Defects tin disulphide Magnesium/lithium-ion hybrid batteries 2D materials

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