Preparation method and application of positive electrode catalyst of lithium-oxygen battery

Abstract

The application belongs to the technical field of lithium-oxygen battery materials, and particularly relates to a preparation method and application of a positive electrode catalyst of a lithium-oxygen battery. The method comprises the following steps: S1: dissolving iron salt, cobalt salt and sodium hydroxide in a first solvent, then adding ethylenediamine to obtain a mixed solution, and performing a reaction at a temperature of 105-115 DEG C to obtain a cobalt-iron ferrite carrier; S2: then, the cobalt-iron ferrite carrier obtained in S1 is heat-treated at 145-155 DEG C under 5% argon-hydrogen mixed gas to introduce oxygen defects, and the obtained material is dispersed in a second solvent; S3: a certain amount of palladium precursor solution is added, a reducing agent is added after stirring for a certain time to obtain a palladium nanoparticle loaded material, and then the material is annealed at 340-360 DEG C under argon protection to obtain the positive electrode catalyst. The application solves the slow oxygen reduction / precipitation kinetics in the lithium-oxygen battery, effectively solves the core problem in the existing lithium-oxygen battery technology, and thus promotes the commercialization process.

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