| 초록 |
We introduce polymerized ionic liquid (PIL)-based random copolymers comprising styrene and pyrrolidinium-based ionic liquid as the monomers to improve electrochemical performances of Li metal anode in Li metal batteries (LMBs). The PIL-based random copolymer, polystyrene-co-polyvinylbenzyl-methyl-pyrrolidinium bis(fluorosulfonyl)imide (PS-VBMP FSI), contains both strengthen part and Li ion-balancing part, which can effectively prevent the formation of dendrite on the surface of Li during charge/discharge process causing performance deterioration of LMBs. NMR, MALDI-TOF, and GPC are used to confirm the molecular structure of the obtained polymer followed by synthetic process of the polymer. Also, we investigate molecular dynamics computer simulations indicating depressed dendrite formation due to Li ion shielding effect of PIL parts on the dendrite initiation point. Through this work, we systemically demonstrate the potential of the PIL-based random copolymer to improve cycle stability of Li metal in not only liquid system but also all-solid system due to depression of the dendrite formation, leading to the assembly of Li metal anode in the LMBs. |
