Synthesis Of Rare Earth Sulfides And Their Electrochemical Properties

Lithium-sulfur batteries have low cost, high capacity, low pollution and other characteristics, is a kind of good prospects for lithium ion secondary battery. But lithium-sulfur batteries are still has low conductivity, poor circulation performance shortcomings, need further research to improve lithium sulfur batteries.Rare earth have special4f electronic structure, the rare earth compounds in sound, light, electricity, magnetism, heat and catalytic aspects have a wide range of applications. Rare earth sulfur compounds with unique physical and chemical properties. Rare earth sulfur compounds for high melting point, low thermal conductivity and by the ability to shift between doping in the metal conductor and an insulator, and high Seebeck coefficient and electrical conductivity, Can improve the conductive performance of sulfur electrode in lithium sulfur batteries. At the same time, the compatibility of rare earth sulfide and sulfur, can better improve cycle performance of lithium sulfur batteries.In this dissertation, we prepared Y2O2S nanofibers by electrospinning, prepared Y2O2S nandroads by hydrothermal method, synthesized YS by High temperature solid phase method. Use rare earth sulfide as the electrode materials, rare earth combined with lithium sulfur batteries. The physical and electrochemical properties of the synthesized samples were characterized by XRD, FE-SEM, CV, EIS and charge-discharge test, et al. Change the lithium-sulfur battery performance, In order to achieve improved lithium sulfur batteries in the working process of the low conductivity, the drawback of the poor circulation performance objectives.