Preparation method of composite lithium-sulfur battery electrode material with three-dimensional conduction core-shell structure

Abstract

The invention provides a preparation method of a composite lithium-sulfur battery electrode material with a three-dimensional conduction core-shell structure, which comprises the steps of dissolving polyacrylonitrile in an N, N-dimethylformamide solvent to obtain a sheath fluid; dissolving iron disulfide and polyvinylpyrrolidone into the N, N-dimethylformamide solvent to obtain a core fluid; respectively placing injectors filled with the core fluid and the sheath fluid on two injection pumps of an electrostatic spinning device for coaxial electrostatic spinning, collecting protofilament fibersjetted by electrospinning on a rolling shaft, then putting the obtained protofilament fibers into a muffle furnace with an air atmosphere for pre-oxidation, then carbonizing in a protective atmosphere of an inert gas to obtain an iron disulfide / carbon-coated carbon fiber composite material with a core-shell structure, immersing the obtained iron disulfide / carbon-coated carbon fiber composite material into dilute nitric acid, stirring, carrying out suction filtration, and drying to finally prepare the carbon-coated carbon fiber / sulfur composite lithium-sulfur battery electrode material with the three-dimensional conduction core-shell structure. The lithium-sulfur electrode material obtained by the invention has the characteristics of high capacity and good cycling stability.

Description

technical field [0001] The invention relates to the technical field of electrical materials, in particular to a preparation method of a composite lithium-sulfur battery electrode material with a three-dimensional conductive core-shell structure. Background technique [0002] With the rapid development of communication, portable electronic equipment and electric vehicles, it is urgent to develop new lithium secondary batteries with high specific energy, low cost and environmental friendliness. In the lithium secondary battery system, the cathode material has always been the bottleneck restricting the development of the battery. The theoretical specific capacity of traditional cathode materials is low and difficult to improve through composition and process. Therefore, the development of energy storage materials with high energy density, long cycle life and low cost is particularly urgent. Elemental sulfur has a high theoretical specific capacity (1675mAh g -1 ) and theoret...

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Problems solved by technology

[0005] The invention aims to solve the obvious technical problems such as low conductivity and shuttle effect of sulfur electrode materials of lithium-sulfur batteries, and provides a preparation method of composite lithium-sulfur battery electrode materials with a three-dimensional conductive core-shell structure

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