| 초록 |
Lithium-oxygen (Li-O2) batteries have received a lot of attention because of their high theoretical energy densities compared with traditional lithium ion batteries. However, technological challenges including low round-trip efficiencies and poor cycle stability should be addressed for the practical use. Among various cell components, carbon-based cathode materials were found to be on of the main origins of limited cycle life becuase the side reactions occur during the charging process. In this presentation, we report the synthesis of ordered mesoporous titanium nitride (m-TiN) and its Li-O2 battery cathode performance. Due to the ordered porous structure and high electric conductivity, the battery exhibited stable cycle performance over 100 cycles. Besides, the use of a solution-phase redox mediator and a poreless separator extended the cycle life to 280 cycles. Therefore, this study proved that sufficient cycle lives of Li-O2 batteries can be achieved when a proper electrode material is combined with advanced separator and electrolyte. |
