Graphene-enhanced sulfur cathode with high interface stability in Li-S batteries

Abstract

The physicochemical properties of graphene and graphene materials obtained by the method of controlled detonation gas synthesis are presented. The fundamental possibility of controlling the graphene and graphene materials physicochemical properties by changing the synthesis conditions is shown. Dynamics of changes in the impedance spectra of Li-S and Li-S-Li batteries with graphene in non-aqueous liquid electrolyte 0.7 M LiIm, 0.25 M LiNO3, DME:DOL (2:1) were studied. The results of electrochemical testing of experimental samples and prototypes of elements of the lithium-sulfur system by the methods of cyclic voltammetry and galvanostatic cycling are presented. The effect of interface stabilization was expressed in a decrease in impedance spectra, an increase in discharge capacity, and more stable long-term cycling with high parameters. The investigation showed a positive effect of graphene materials in the active mass of the multilayered S-based electrode with special design.