Prof. Gwomei Wu
Institute of Electro-Optical Engineering, Chang Gung University, Taiwan, China
Title: Metal-Air Battery Technology and Its New Development
Abstract：New metal-air battery has high energy density, and can be used in many ways. It is composed of three parts, including oxidation-reduction double catalyst and porous air cathode for rechargeable lithium-air battery; aprotic/aqueous electrolytes, high ionic-conducting lithium ion conducting membrane and solid electrolytes; and liquid-flowing battery design, manufacturing, assembly and evaluation/testing. However, the discharge product can block the porous air cathode and hinder oxygen diffusion and degrade the electrochemical efficiency, leading to battery failure. The mixed electrolyte battery uses aqueous electrolyte and ion conducting membrane, so that it can directly consume oxygen and avoid the air cathode blockage by precipitates. On the other hand, the LiOH can precipitate at the saturated concentration of 5.3 M. An alkaline environment will cause corrosion. They all create problems for the long term stability of metal-air battery. We integrate fuel cell and liquid-flowing battery to develop mixed electrolyte energy storage system that can be constantly supplied with unsaturated electrolyte solutions. The ultimate goal will be to increase new battery cycle life with high energy density for electrochemical applications.