Lithium-selenium battery positive electrode material, preparation method thereof and lithium-selenium battery

Abstract

The invention provides a preparation method of a lithium-selenium battery. The preparation method comprises the steps of providing an oxidized graphene dispersing liquid with saturated inert atmosphere; feeding hydrogen selenide gas to the oxidized graphene dispersing liquid with saturated inert atmosphere, reducing the oxidized graphene to graphene by taking the insert atmosphere as carrier gas, and meanwhile, generating elemental selenium on the surface of the graphene to obtain an elemental selenium-graphene dispersing liquid; performing solvent thermal treatment on the selenium-loaded graphene dispersing liquid to obtain graphene-based gel; and drying the graphene-based gel. The invention further provides a lithium-selenium battery positive electrode material and a lithium-selenium battery using the positive electrode material.

Description

technical field [0001] The invention relates to a lithium-selenium battery cathode material and a preparation method thereof, and a lithium-selenium battery. Background technique [0002] Lithium-selenium battery is a new type of lithium secondary battery system, which uses elemental selenium as the positive electrode and metal lithium as the negative electrode. The chemical energy and electrical energy are converted between chemical energy and electrical energy through the chemical reaction between selenium and lithium. Higher energy density of cathode materials. Chinese patent applications CN103187559 A and CN103178246 A respectively disclose the mixing and heating of elemental selenium and microporous carrier or mesoporous carrier, so that elemental selenium is dispersed in the pores of microporous carrier or mesoporous carrier, and can obtain good cycle stability and High-capacity lithium secondary battery with high rate performance. [0003] However, the pores of micr...

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Problems solved by technology

[0003] However, the pores of microporous materials or mesoporous materials are extremely small, and it is difficult for the above-mentioned method to allow elemental selenium to fully and uniformly enter the micropore channels, and the elemental selenium that enters the pores first will block the micropores, making it difficult for more elemental selenium to fully enter. In microporous materials or mesoporous materials, elemental selenium and the carrier cannot be uniformly recombined, making the above method difficult to apply in actual industrial production

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