| 초록 |
Since the Li-ion batteries are reaching the theoretical limit of energy density, there are big waves to explore the next-generation battery chemistry, Li-metal batteries (LMBs). Instead of the graphite anode in Li-ion, LMBs employ the Li metal anode, extremely high capacity of 3860 mAh g-1, which is ten times higher than that of graphite (372 mAh g-1). Despite its promises, LMBs have suffered from challenges, Li dendrite formation. Li dendrites can pierce the separator, triggering a short circuit, eventually resulting in the battery fire. Moreover, anode swelling upon repeated cycling can deteriorate separators due to compressive force inside. In this study, we investigated the separator-deterministic cycling stability of LMBs. Correlating the LMB performances with mechanical/chemical stability of the separator and postmortem analysis of anodes, this study leads to a fundamental understanding on the role of separator on the performance of LMBs. |
