| 초록 |
High energy-density batteries, especially lithium-sulfur (Li-S) batteries are one among the promising candidates that ought to deliver a high theoretical capacity of 1675 mAh g–1 and energy density of 2673 Wh kg–1. Despite several attempts were taken to improve the performance of sulfur cathodes, the development of suitable protection strategies for lithium metal anode is a way behind. Here, we attempt to mitigate dual detrimental factors in Li-S batteries, namely the dendrite growth of lithium metal anode and the polysulfide shuttle using functionalized graphene quantum dots. The effective use of graphene quantum dots enables to suppress the polysulfide shuttle to about several orders than the pristine S@PVDF|Li configuration. The deposition and stripping process of symmetric graphene quantum dots constructed cell operated at a current density of 5 mA cm–2 exposed low voltage hysteresis and about four-fold times improvement in the cycle stability. |
