▎ 摘　　要

NOVELTY - A preparation of a high-load sulfur, high-density carbon-sulfur composite positive electrode sheet, involves (1) mixing carbon material, binder and solvent, coating a layer (I) of carbon material on upper surface of positive electrode current collector and drying to form a carbon layer (I), (2) mixing the sulfur, the binder and the solvent, coating the layer (I) of sulfur on carbon layer (I) and drying to form the layer (I) of sulfur, (3) mixing the carbon material, the binder and the solvent, coating a layer (II) of carbon material on the sulfur layer (I) and drying to form a carbon layer (II), (4) mixing the sulfur, the binder and the solvent, applying a layer (II) of sulfur on the carbon layer (II) and drying to form a sulfur layer (II), (5) mixing the carbon material, the binder and the solvent, applying a layer (III) of carbon material on sulfur layer (II) and drying to form a carbon layer (III), and (6) carrying out vacuum hot pressing on a flat hot pressing machine. USE - Preparation of high-load sulfur, high-density carbon-sulfur composite positive electrode sheet for lithium-sulfur battery (all claimed). ADVANTAGE - The method provides high sulfur-loaded, high-dense carbon-sulfur composite positive electrodesheet with high sulfur content and high density. The positive electrode can effectively realize the electrochemical performance of sulfur and improve the cycle performance of the battery. DETAILED DESCRIPTION - A preparation of a high-load sulfur, high-density carbon-sulfur composite positive electrode sheet, involves (1) fully mixing the carbon material, the binder and the solvent, coating a layer (I) of carbon material on the upper surface of the positive electrode current collector and drying to form a carbon layer (I), (2) after fully mixing the sulfur, the binder and the solvent, coating the layer (I) of sulfur on the carbon layer (I) and drying to form the layer (I) of sulfur, (3) after fully mixing the carbon material, the binder and the solvent, coating a layer (II) of carbon material on the sulfur layer (I) and drying to form a carbon layer (II), (4) after fully mixing the sulfur, the binder and the solvent, applying a layer (II) of sulfur on the carbon layer (II) and drying to form a sulfur layer (II), (5) after fully mixing the carbon material, the binder and the solvent, applying a layer (III) of carbon material on the sulfur layer (II) and drying to form a carbon layer (III), and (6) carrying out vacuum hot pressing on a flat hot pressing machine. INDEPENDENT CLAIMS are included for: (1) a lithium-sulfur battery, which comprises layer (I), layer (II) and layer (III) coated on the surface of the positive electrode current collector with carbon loadings of 0.1-1.5 mg/cm2. The carbon material is one or more of carbon black, graphite, graphene, carbon nanotubes and carbon nanotube-graphene hybrids. The binder is carboxymethyl cellulose, styrene-butadiene rubber, acrylic acid, polyvinylidene fluoride, and the solvent is water and N-Methyl-2-Pyrrolidone. The carbon material content is 90-99%, and the binder content is 1-10%. ; (2) a carbon-sulfur composite positive electrode sheet with high sulfur loading and high density.