The Synthesis Of Two-dimensional Layered?MoSe₂,MoS₂?Nanomaterials And Their Energy Storage Properties

Because of the outstanding electrochemical performance, Lithium-ion batteries?LIBs? have gradually replaced the traditional power supply and widely used in our daily lives. Large capacity, small size, light weight, long service life has always been the aspirations of people for energy storage devices. In this thesis, we take the two-dimensional layered material?MoSe₂, MoS₂? as the research object, aiming at developing high performance anode materials for lithium-ion batteries. The main research results are as follows.?1? Sheet-like MoSe₂/C composites were synthesized and their applications as LIBs anode were also studied. At the current density of 100 mA g-1, the anode delivered high reversible discharge capacity of 576.7 mA h/g over 50 cycles with a capacity retention of 93%. When the current density increased to 2000 mA/g, it still exhibits a specific capacity of 450 mA h/g, showed good cycling stability and rate performance.?2? TiO₂@MoS₂ core-shell nanostructure was synthesized on Ti substrate and directly evaluated as lithium ion battery anode. This binder-free composite nanostructures electrode retained the advantages of TiO₂ and MoS₂, exhibit excellent electrochemical performance, which exhibits a high reversible discharge capacity of 509.4 mA h/g with no capacity loss at the current density of 200 mA/g over 100 cycles.?3? graphene-like MoS₂ nanosheets on carbon fabrics and their applications as LIBs and supercapacitors?SCs? binder-free electrode were also studied. When evaluated as anode of LIBs, I adopted a testing voltage window of 1 3 V, Successfully avoided the capacity contribution of carbon fabrics to the whole electrode which may result in the calculated capacity of active materials higher than real, and also exhibits high specific capacity and good cycling stability. When evaluated as anode of SCs, the carbon fabrics as the current collector successfully avoided the side effect of Ni foam?surface generation NiOOH? in alkaline aqueous solution which may result in error and exaggerated capacitance. When evaluated as electrodes for SCs, the as-synthesized integrated electrodes exhibited long cycling stability up to 15000 cycles with capacitance retention of 80.6% in a two electrode coin cells configuration.