Method for preparing lithium-sulfur battery cathode material

Abstract

The invention discloses a method for preparing a lithium-sulfur battery cathode material. The method comprises the following steps: firstly, weighing nano-titanium dioxide (TiO2) powder and elemental sulfur S in the set mass ratio; heating an oil bath pan to a certain temperature, putting the weighed elemental sulfur into the oil bath pan and melting the elemental sulfur; after the elemental sulfur is completely molten, adding the weighed titanium dioxide powder, further heating and stirring the titanium dioxide powder until the titanium dioxide and sulfur are mixed evenly; and carrying out cooling treatment, further stirring the mixture, heating the mixture again, cooling and stirring the mixture again, naturally cooling, and then grinding the mixture into powder, so as to finally prepare the lithium-sulfur battery cathode material of TiO2 / S. According to the method, the cathode composite material can be rapidly and efficiently synthesized; and the possibility is provided for commercialization of Li-S batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a method for preparing positive electrode materials for lithium-sulfur batteries. Background technique [0002] At present, many shortcomings of cathode materials for lithium-sulfur batteries (Li-S batteries) have been the reasons that restrict the widespread commercialization of Li-S batteries, and the modification strategies for cathode sulfur S are mainly focused on confining sulfur to conductive porous matrix materials. Inside, such as conductive carbon materials carbon nanotubes, mesoporous microporous carbon, graphene oxide, etc., conductive polymers, and conductive metal oxides such as titanium dioxide, magnesium oxide, etc. [0003] In the prior art, the methods for impregnating sulfur bound into conductive porous matrix materials mainly include solution method and solid phase method. The solution method is to let the porous material coat the outer layer ...

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Problems solved by technology

[0003] In the prior art, the methods for impregnating sulfur bound into conductive porous matrix materials mainly include solution method and solid phase method. The solution method is to let the porous material coat the outer layer of the elemental S particles in a certain solvent. This method synthesizes The electrochemical performance of the material is good, but the synthesis method is relatively complicated; another method is to mix the elemental S and the matrix material according to a certain mass ratio, and put them in a nitrogen atmosphere for sintering at 155°C for more than 20 hours. This method has better electrochemical performance. Good, and the synthesis method is simple and feasible, but it requires high equipment, long synthesis time, high energy consumption, and little economic benefit

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