▎ 摘　　要

NOVELTY - Lithium-sulfur battery positive electrode material having sandwich layered structure is cobalt selenide-carbon nanowires doped reduced graphene oxide-sulfur composite material. The positive electrode material of the lithium-sulfur battery includes cobalt selenide carbon nanowires and peripheral layered reduced graphene oxide. The diameter of the cobalt selenide carbon nanowire is 100-150 nanometer. The reduced graphene oxide is a layered nanostructure that allows fast electron/ion transfer. USE - Lithium-sulfur battery positive electrode material having sandwich layered structure. ADVANTAGE - The lithium-sulfur battery positive electrode material having sandwich layered structure can improve the cycle stability performance and rate performance of the lithium-sulfur battery, suppress the shuttle effect problem in the lithium-sulfur battery, and improve the electrochemical performance of the lithium-sulfur battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. a method for preparing a lithium-sulfur battery positive electrode material having sandwich layered structure, which involves: (a) dissolving 1.9-2.4 g cobalt chloride hexahydrate in 45-60 ml deionized water with specific dosage ratio under magnetic stirring at 60 revolutions per minute, adding 0.9-1.2 g nitrilotriacetic acid, performing hydrothermal reaction at 180℃ for 12 hours; (b) cooling to room temperature, centrifuging at 5500 r/s for 20 minutes, washing with deionized water and absolute ethanol for 5 minutes each; (c)vacuum drying at 60℃ for 12 hours to obtain the cobalt carbon nanowire precursor; (d) dissolving 1.5-2g cobalt carbon nanowire precursor in 45-60 ml deionized water under 60 revolutions per minute magnetic stirring, adding 1.5-3 g glucose, reacting hydrothermally for 12 hours; (e) cooling to room temperature, centrifuging at 5500 r/s for 20 minutes, washing with deionized water and absolute ethanol for 5 minutes each, vacuum-drying at 60℃ for 12 hours to obtain cobalt-carbon nanowires; (f) transferring the cobalt carbon nanowires to the tube furnace, placing a quartz boat with built-in selenium powder at the upstream air inlet of the furnace; (g) puffing directly the selenium powder at the air inlet into the cobalt carbon nanowires for reaction under the protection of inert gas to obtain cobalt selenide carbon nanowires, where the reaction temperature is 550℃, the reaction time is 4 hours, the cobalt carbon nanowire and selenium powder dosage ratio are 0.5-1g:2-4 g; (h) dispersing ultrasonically graphene oxide, adding the cobalt selenide carbon nanowires, performing a hydrothermal reaction at 180℃ for 5 hours; (i) cooling to room temperature, centrifuging at 5500 r/s for 20 minutes, washing with deionized water and absolute ethanol for 5 minutes each, vacuum drying at 60℃ for 12 hours to obtain cobalt selenide (CoSe2)-carbon nanowires (CNWs) doped reduced graphene oxide (rGO), where the consumption ratio of cobalt selenide carbon nanowire and graphene is 2-3.5 g:1-1.5 g; (j) mixing CoSe2-CNWs doped rGO and sulfur (S) powder, grinding for 20-30 minutes, and reacting under the protection of inert gas to obtain CoSe2-CNWs doped rGO/S composite material, where the reaction temperature is 155℃, and the reaction time is 12 hours; and 2. an application of a lithium-sulfur battery positive electrode material having a sandwich layered structure in a lithium-sulfur battery, which comprises: a positive electrode, a negative electrode and an electrolyte, where the positive electrode is the lithium-sulfur battery positive electrode material with a sandwich layered structure or a lithium-sulfur battery positive electrode material prepared by the preparation method.