| 초록 |
Li-S batteries (LSBs) are promising energy storage system due to their high theoretical energy density of 2,600 Wh/kg and capacity of 1,675 mAh/g. However, their practical application is hampered by the facts that 1)cycle stability of LSBs is poor and 2)LSBs have relatively low areal capacity (~2 mAh/cm2) than commercial Li-ion batteries (4 mAh/cm2). In this work, we circumvent these problems by using catholyte(Li2S6) and 3D microporous carbon current collector. We optimized amount of sulfur in catholyte in terms of areal capacity. It was found that lithium-polysulfide batteries exhibit the highest area capacity of 4 mAh/cm2 at 0.1C in the presence of 6 mg sulfur/cm2. Detailed analyses of galvanostatic cycling with potential limitation, cyclic voltammetry and electrochemical impedance spectroscopy are given for confirming battery performances. |
