| The factors affecting the properties of air electrode were examined in this article and MnO2/C was prepared. The process parameters of air electrode were optimized, and the aluminum/air battery was also assembled.In the experiment of catalyst preparation, the catalytic activity of MnO2/C which was prepared with Mn(NO3)2 solution and active carbon by the means of thermal decomposition reached the highest among three kinds of catalysts, and the performance of MnO2/C was enhanced by acidification. Moreover, the results showed that the catalytic activity of MnO2 was also affected by different mode of catalyst and active carbon dispersed.The properties of air electrode and catalyst were investigated by measuring the curve of steady-state polarization. The optimum conditions for air electrode preparation were shown as follow: 20% PTFE and 20% MnO2 in active layer, thickness of active layer 0.15-0.25mm and the ratio of active carbon to ethine black 4 : 1; 60% PTFE in the gas diffusion and waterproof layer, employing Na2SO4 as pore-making agents, thickness 0.35-0.45mm, colding forming and layer sequence catlytic layer / gas diffusion and waterproof layer / current collector layout; employing 40 meshed nickel screen as current collector and thermal treatment temperature over 200 ℃. The results showed air electrode(1cm2) which had been optimized exhibited good performance that short circuit current of aluminum/air battery was as high as 380mA and the polarization potential was diminished from 0.259V to 0.212V at 60mA/cm2 when the concentration of salt electrolyte was 2mol/l.The discharging capacity of single aluminum/air battery was over 40Ah with 4A, and the output power of aluminum/air battery pack was as high as 110W.
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