The Research Of The Energy Storage And Synthesis Of MoS₂ And Tin Base Composite Materials

As the boom of economy and the following demand of energy increases,which leads to the problems of environmental pollution,resource shortage and energy crisis.Both the government and the citizens paid more attention to the green energy.Lithium ion battery?LIBs?has been promoted the large-scale application of energy storage device because of its many advantages?high energy density and long cycle life?,which leading to the shortage of lithium resources.In recent years,The researchers are committed to developing Sodium ion batteries?SIBs?and Potassium ion battery?KIBs?,but the research of KIBs is still in the basic stage.So,it is great significance to develop the approprite negative materials with high performance for SIBs and KIBs.The main innovative research results of this paper are as follows:?1?The author prepared MoS₂@SnO₂@C sandwich nanosheets by simple hydrothermal method and investigted the forming mechanism of sandwich nanosheets and tested the electrochemical properties of the MoS₂@SnO₂@C?for SIBs and KIBs?.As a negative electrode for SIBs,MoS₂@SnO₂@C electrode can develop initial discharge specific capacity of 595 mAh g^-1 at 0.1 A g^-1,Even at 1 A g^-1,can still maintained 230 mAh g^-1 after 450 cycles.And the sandwich nanosheets is unchanged after many cycles.For KIBs,it can still maintain 312 mAh g^-1 after 25 cycles at 0.05A g^-1 revealling this energy storage material of sandwich structure has good cycle stability,which will greatly promote the industrialization of the research achievements of high capacity,long life and low-cost secondary battery.?2?the Sn is reduced from SnO₂ in the MoS₂@SnO₂@C by annealing in Ar/H₂ to from the Sn-MoS₂@C nanostructure,we observed that the nanosheets structure was partially transformed into the nanoparticle structure,and the electrochemical properties of the Sn-MoS₂@C?for SIBs and KIBs?was tested.For SIBs,Sn-MoS₂@C electrode had the initial capacity of 536 mAh g^-1,remained 431 mAh g^-11 after 90 cycles at 0.1 A g^-1.For KIBs,it has the discharge capacity of 290 mAh g^-1 at 0.1 A g^-1,and 123 mAh g^-1 at 0.8 A g^-1,which show that Sn-MoS₂@C has good rate performance.This work provides new potential applications for other compounds as rechargeable batteries.