Conducting materials for cathode used in Zinc air batteries

Abstract

There was a wide difference in the average discharge voltage as shat kinds of conducting material were adapted. When we use VGCF, we`ve got the lower average discharge voltage as compared with the case of using other conducting material. VGCF is very fine carbon fiber. So it disturbs activated carbon to keep the optimumporosity. As the result of that it`ll be not possible to supply oxygen through the pore of activated carbon. If oxygen is not supplied sufficiently then it cause increase the activation loss and average discharge voltage becomes lower consequently. Zinc air batteries have characteristic of very high energy density, and also have characteristic of low power density. Because of low average discharge voltage, we excluded the VGCF in our consideration. And compared the power performance of Super P black adapted battery with Acetylene black adapted battery. When same am\ount of carbon black was adapted as shown in figure 1, Super P black adapted battery have higher power density. its reason is that if we manufacture the cathode using Super P, We can have more amount of porosity than the case of using acetylene black.