| 초록 |
Since the importance of high energy storage device increase, researchers paid attention to Li–O2 battery which has incredibly high theoretical capacity. However, solid and nonconductive discharge products have made several problems: high OER overpotential, poor cyclability, and low energy efficiency. We have studied the effect of mesoporous structure of cathode materials on Li-O2 batteries. Only mesoporous carbon were synthesized to focus on the effects of mesoporous structures. CMK-3 and MSU-F-C were used and compared with commercial carbon, Super P. At low current density, materials with larger surface area showed the lowest overpotential because it can disperse the discharge product. In contrast, at high current density, materials with large and 3-D open pores have showed the lowest overpotential because almost no pore clogging was happened. Thus, to reduce the overpotential and increase the cycles, cathode materials of Li-O2 batteries must have mesoporous structure with large, opened pores with high surface area. |
