Preparation Of Tin Disulfide/Carbon Composites For Supercapacitor Electrodes

With the rapid development of wearable electronic devices in recent years,people have begun to demand higher performance and convenience of electronic devices.Electronic devices that are lightweight,foldable,and mechanically strong are increasingly in need of development.As a kind of energy-efficient storage device,supercapacitors will play an important role in the development of future wearable electronic devices due to its fast charge and discharge rates,high power density,long energy life,and wide temperature range.However,the lower energy density defect greatly affects its commercial value.As its most important component,the electrode material of a supercapacitor is a key component that affects its performance.Therefore,it is very important to develop a flexible,low-cost,and high-power-density flexible electrode material through a simple and green synthesis process.Transition metal sulfide materials are considered candidates for use as electrodes for energy storage devices due to their rich reserves,environmental friendliness,accessibility,and other attractive characteristics;for example,their compositions and morphologies vary,Large surface area,theoretically higher than capacitance.In addition,they play a central role in the electrodes of electrochemical supercapacitors and significantly improve capacitance by regulating and controlling their defects and surfaces.Although their energy density shows a certain degree of enhancement,their low electrical conductivity,uncontrollable volume expansion and slow ion diffusion into the bulk phase hinder their practical application.Therefore,it is most important and urgent to explore functional metal oxide materials with improved electrochemical performance.In this paper,the electrochemical performance test using tin disulfide(SnS2)as the electrode material from transition metal sulfide is mainly explained.By compounding with typical carbon materials(such as dopamine hydrochloride and graphene),tin disulfide/carbon composite materials are formed.This method improves the low conductivity of transition metal sulfides and morphological collapse during cycling by compounding tin disulfide and carbon materials,and greatly improves specific capacitance and cycle stability.The research contents of this article are as follows:First,using anhydrous tin tetrachloride as the tin source and cysteine as the sulfur source,the sulfur source and the tin source were synthesized in a high-pressure reaction kettle under different conditions by a simple one-pot synthesis method.XRD,SEM,BET and other characterization methods were used to compare the products synthesized under different conditions.Several products compared with the JCPDS card number were tin disulfide for electrochemical performance testing.It is concluded that the product obtained under the conditions of 180℃ and 24 h has the best performance.When the current density is 1 A/g,the specific capacitance of the material can reach 290.4 F/g,and the current density rises to 1.5 A/g When the specific capacitance is 240.7 F/g,it is only 82.9%.In order to improve the defects of the electrochemical performance of tin disulfide,two different carbon materials were selected for compounding,one was dopamine as the carbon precursor(DDC),and the other was graphene carbon prepared by the liquid phase stripping method(rGO)materials.XRD,Raman,SEM,TEM,BET,XPS,EDS and other characterizations were used to test and analyze the crystal phase and microstructure of the samples.In testing the electrochemical performance,the specific capacitance of the dopamine-carbon composite was 415.4 F/g at 1 A/g,and 393.3 F/g at 1.5 A/g,and the specific capacitance of 94.6%was preserved.When using graphene as the carbon source composite,the specific capacitance was 386.2 F/g at 1 A/g,and the specific capacitance was 379.6 F/g at 1.5 A/g,maintaining a specific capacitance of 98.3%.It shows that both composites effectively improve the electrochemical performance of tin disulfide.