Preparation And Properties Of Antimony Sulfide Based Anode Composites

Lithium-ion batteries(LIBs)have the characteristics of environmental protection,wide operating temperature applicability,energy density,etc.,and have been successfully applied in new energy vehicles,various power equipment and uninterruptible power supply systems.The theoretical capacity of the traditional graphite anode is only 372 mA h g-1,which cannot meet the energy storage market's demand for high-power and high-energy density of LIBs.Therefore,the development of a new type of anode material that can effectively improve the energy density,rate performance as well cycle life of LIBs is the focus of current research.Sb2S3 material has a higher theoretical specific capacity(946 mA h g-1),abundant resources in nature,and low cost which makes its potential high-performance LIBs anode material.However,Sb2S3 will undergo a certain degree of volume expansion(?390%)during the lithium ion insertion/extraction process,wherein its low ionic conductivity results in low diffusion and charge transfer kinetics while exhibiting a a significant decrease in the duration of the cycle capacity.How to improve the expansion of antimony sulfide materials,increase cycle life,and reduce material resistance is a major challenge for the development of antimony sulfide anode materials.In this paper,a kind of Sb2S3 nanowires(SBSWs)was prepared by a hydrothermal method.At a current density of 50 mA h g-1,they exhibited a high initial reversible capacity of 835 mA h g-1,and the initial coulombic efficiency was 88%.when the current density increased to 100 mA h g-1,the reversible capacity of 174 mA h g-1 still maintained after 100 cycles.SBSWs effectively shorten the lithium ion diffusion path,increase the active sites on the electrode surface and the interaction with the electrolyte.The specific surface area between.Through van der Waals force self-assembly,SBSWs and three-dimensional graphene framework(rGO)are compounded to prepare a SBSWs/rGO composite material.As a conductive framework,rGO provides a large number of electron channels and promotes the electron transfer of active materials in the charge/discharge process.Secondly,loading SBSWs with rGO reduces the volume change of Sb2S3,so the composite material has good structural stability.When used as the negative electrode of LIBs,SBSWs/rGO exhibits an initial reversible capacity of 853 mA h g-1 when the current density is 50 mA g-1,and still retains 505 mA when the current density increased to 3 A g-1.SBSWs/rGO also possess high reversible capacity,and the reversible specific capacity is stable at 697 mA h g-1 after 100 cycles when the current density is 100 mA g-1.In order to explore the effect of different composite materials on the performance of SBSWs,a SBSWs/MXene material was obtained by anchoring SBSWs on MXene nanosheets through electrostatic self-assembly,with an initial reversible capacity of 813 mA h g-1 at a current density of 50 mA g-1,and it still retains a high reversible specific capacity of 735 mA h g-1 after 100 cycles at a current density of 100 mA g-1,and 466 mA h g-1 at a current density of 3 A g-1 specific capacity As the underlying substrate,MXene nanosheets can not only realize the reversible transport of electrons and ions on the interface,but also prevent the agglomeration of SBSWs during the lithium ion insertion/extraction process,and MXene nanosheets can be effectively improved through excellent mechanical flexibility The volume expansion of Sb2S3 occurs during the cycle.