| 초록 |
Lithium (Li) metal as battery anode is one of the most promising energy storage materials owing to its high theoretical capacity and low working potential. However, uncontrollable Li growth during electrochemical cycling causes battery safety issues from dendrite formation and poor coulombic reversibility. Here, we introduce that optimal condition of carbon nanodots (CDs) as an additive in carbonate electrolytes significantly improves Li plating morphology and cycling stability of lithium metal batteries (LMBs). Various functional groups in CDs provide strong Li ion affinity, which enable uniform Li-ion transportation to current collector, resulting in dendrite free metal reduction during the plating. In LMB tests, CD electrolytes exhibit limited increase of overpotential for 500 cycles and excellent cyclability of 99.9% capacity retention after 100 cycles. The CDs-assisted Li deposition minimizes the risks originated from Li dendrite growth, stabilizing the cycle performances of LMBs. |
