Thin-wall local graphitization porous carbon sphere material, preparation method thereof and application thereof in lithium sulfur battery

Abstract

The invention discloses a thin-wall local graphitization porous carbon sphere material, a preparation method thereof and application thereof in a lithium sulfur battery. The porous carbon sphere material is a local graphitization porous carbon nanosphere with thin wall holes; the preparation method of the thin-wall local graphitization porous carbon sphere material comprises the steps that water-base resin, water-soluble inorganic salt, a surface active agent and transition metal salts are dissolved into water to obtain a spraying solution; the spraying solution is sprayed and dried to obtaina local graphitization porous carbon nanosphere precursor; the local graphitization porous carbon nanosphere precursor is subjected to pyrolysis to obtain the thin-wall local graphitization porous carbon sphere material. The preparation method is simple in technology and good in repeatability, the prepared thin-wall local graphitization porous carbon sphere material has the advantages of being good in electrical conductivity, large in aperture, high in specific surface area and the like, the thin-wall local graphitization porous carbon sphere material is applied to a lithium sulfur battery sulfur carrier, the high specific capacity, long cycling stability and high rate capability are achieved, and the wide application prospect is achieved.

Description

technical field [0001] The present invention relates to a porous carbon material, in particular to a thin-walled locally graphitized porous carbon sphere material and a preparation method thereof, and also relates to its use as a lithium-sulfur battery anode carrier in a thin-walled locally graphitized porous carbon sphere material. The application of sulfur materials belongs to the field of lithium ion battery materials. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronics, pure electric vehicles, and plug-in hybrid electric vehicles, there is an urgent need to develop batteries with higher energy density. Due to the limitation of specific capacity improvement of cathode materials of traditional lithium-ion batteries, it is difficult to further increase the energy density of lithium-ion batteries. At the same time, increasing the energy density by increasing the voltage platform of the cathode material will bring sa...

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Problems solved by technology

[0005] Aiming at the problems of low sulfur loading capacity, low energy density, and poor cycle performance in the porous carbon sphere materials used for sulfur loading in lithium-sulfur batteries in the prior art, the first purpose of the present invention is to provide a uniform particle size, Well-developed pores, thin pore wall, large specific surface area, large pore volume, and good electrical conductivity. Thin-walled locally graphitized porous carbon sphere materials with these characteristics are relatively ordinary porous carbon sphere materials. The carbon material has a higher sulfur loading capacity, can effectively inhibit the dissolution of polysulfides in the electrolyte, and has good conductivity, especially suitable for lithium-sulfur battery positive electrode sulfur-loading materials

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