NITROGEN-DOPED GRAPHENE COATED NANO-SULFUR ANODE COMPOSITE MATERIAL AND PREPARATION METHOD AND APPLICATION THEREOF

摘要

The present invention relates to a nitrogen doped graphene-coated nano-sulfur positive electrode composite material, a manufacturing method and an application thereof. Wherein the composite material is a three-dimensional conduction network formed by overlapping with each other by nitrogen doping grains; And nano sulfur particles uniformly covered with a nitrogen doping graphene monolayer. The composite material manufacturing method comprises dispersing nitrogen doping graphene in a liquid phase reaction system containing at least a sulfur raw material and an acid, precipitating nano sulfur particles through a distal chemical reaction between sulfur raw material and an acid to obtain a target product. INDUSTRIAL APPLICABILITY The composite material of the present invention has high conductivity, high utilization ratio and rate characteristics of sulfur, effectively suppressing the dissolution and reciprocating effect in the lithium sulfur battery, improving the cyclic stability of the battery, and improving the nitrogen doped graphene- Is characterized by high capacity, high circulation stability, and high rate characteristics, and the production process of the composite material is simple, and the cost is reduced, which is suitable for large-scale production.