Origin of Excellent Charge Storage Properties of Defective Tin Disulphide in Magnesium/Lithium-Ion Hybrid Batteries  

作　　者：Xin Fan Mike Tebyetekerwa Yilan Wu Rohit Ranganathan Gaddam Xiu Song Zhao 

机构地区：[1]School of Chemical Engineering,The University of Queensland,St Lucia,Brisbane,QLD 4072,Australia [2]School of Material Science and Technology,North University of China,Taiyuan 030051,Shanxi,People’s Republic of China [3]Dow Centre for Sustainable Engineering Innovation,School of Chemical Engineering,The University of Queensland,St Lucia,Brisbane,QLD 4072,Australia [4]Department of Chemical Engineering,Indian Institute of Science Education and Research,Bhopal,India

出　　处：《Nano-Micro Letters》2022年第11期87-106,共20页纳微快报（英文版）

基　　金：supported by The Australian Research Council (Project ARC FL170100101);the Research Project Supported by Shanxi Scholarship Council of China (2021-128);Supported by the Fundamental Research Program of Shanxi Province (20210302124356).

摘　　要：Lithium-ion batteries(LIBs)are excellent electrochemical 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 Mg^(2+) diffusion kinetics and severe electrode polarizability.Rechargeable 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 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(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 conditions.The role played by the defects in the SnS_(x)/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 SnS_(x),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 Mg^(2+) and Li+insertion.This 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 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ134.32[化学工程—无机化工]