Preparation method of sulfur and nitrogen double-doped lithium air battery positive electrode catalyst

Abstract

The invention discloses a preparation method of a sulfur and nitrogen double-doped lithium air battery positive electrode catalyst, and belongs to the technical field of chemical power supplies. For solving the problems of poor stability, poor catalytic activity and the like of an existing lithium air battery carbon-based catalyst, the preparation method comprises the steps: mixing raw materials containing sulfur and nitrogen elements with a carbon matrix in a solvent, transferring the mixture into a closed reaction container, and carrying out solvothermal reaction at the temperature of 150-260 DEG C to form a precursor dispersion liquid; and carrying out centrifugal washing on the precursor dispersion liquid, carrying out vacuum drying, and carrying out high-temperature cracking in a protective atmosphere to obtain the lithium air battery positive electrode catalyst. The bifunctional positive electrode catalyst is a carbon-based material formed by doping two non-metallic elements with similar electronegativity, can be used for an organic system, an all-solid-state lithium air battery system, a water system lithium air battery system and a water / non-water mixed system lithium air battery system, effectively reduces the charge-discharge overpotential, and improves the cycle stability of the battery.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a preparation method of a lithium-air battery cathode catalyst double-doped with sulfur and nitrogen. Background technique [0002] Since Japan's Sony Corporation developed the first commercial lithium-ion battery in 1991, the practical application of lithium-ion batteries has been greatly promoted, not only widely used in aerospace, satellite, missile and other special equipment fields, but also widely used in civilian fields such as electric Automobiles, portable charging devices, and flexible wearable devices, etc. In recent years, with the continuous expansion of the application of batteries in the field of energy storage, higher requirements have been put forward for their energy density, rate performance and cycle life. Among the current commercial batteries, the most commonly used lithium-ion batteries have problems such as small theoretical cap...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a lithium-air battery cathode catalyst doped with sulfur and nitrogen in order to solve the problems of poor stability and poor catalytic activity in the current lithium-air battery carbon-based catalysts.

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