▎ 摘　　要

NOVELTY - A manganese oxide-graphene nano composite catalyst is obtained by utilizing liquid phase ultrasound composite manganese oxide and graphene dispersed liquid. USE - Manganese oxide-graphene nano composite catalyst for preparing a membrane electrode that is utilized in a lithium air battery. ADVANTAGE - The nano composite catalyst has high discharging specific capacity and good charging/discharging cycle reversibility, high chemical stability and specific capacity and better cycle performance, and decreases charging/discharging over-voltage, and can be prepared in a simple and easy manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing manganese oxide-graphene nano composite catalyst.