| 초록 |
Li−O2 batteries have received considerable attention as next-generation rechargeable batteries. Li−O2 batteries use gas-phase oxygen molecules as a cathode material and it allows the cells to hold 3−5 times higher capacities compared to those of the conventional LIBs. However, the superoxide radicals generated during the discharging process cause irreversible side reactions, and the attack of radicals prevents it from performing long cycle life. To address this issue, this study was inspired by the role of eye melanin. The human eye is analogous to Li−O2 batteries because eyes are also attacked by superoxide radicals generated by ultraviolet light, however, human eyes had developed effective defense mechanism using melanin to scavenge radicals. To mimic such a defense mechanism, polydopamine (pD), which is one of the synthetic melanins, was added in the electrolyte. The pD additive significantly alleviated the irreversible side reaction and resulted in superior cycling performance. |
