Air electrode used in aluminum-air battery and preparation method of air electrode

The invention relates to an air electrode used in an aluminum-air battery and a preparation method of the air electrode and belongs to the technical field of batteries. The air electrode can be used in the aluminum-air battery as a positive electrode and is prepared by laminating three layers, namely, a waterproof and gas-permeable layer, a catalyst layer and a collector layer, wherein the catalyst layer comprises the following components in percentage by weight: 30-90% of an electrode catalytic material, 5-30% of a conductive material and 5-40% of a binder material, wherein the total weight of the electrode catalytic material, the conductive material and the binder material is 100% by weight. By controlling the crystal form, doping metals, compounding carbon and the like, the obtained modified manganese dioxide material has catalytic efficiency comparable to that of a noble metal catalyst and can provide higher power for the aluminum-air battery. The preparation method of the catalytic electrode provided by the invention has the characteristics that the method is simple, efficient and clean and environmental pollution cannot be caused.