| 초록 |
Passivation of the cathode by insulating lithium sulfide (Li2S) imposes a limitation in realizing high sulfur utilization of lithium sulfur (Li-S) batteries. The use of high donor number solvents can retard the cathode passivation due to their Li2S solubility, however, the rigorous Li metal corrosion prevents their practical use. In this talk, a particulate Li2S growth by using salt anions with high DN in electrolyte is reported. With increasing the DN of salt anion, three-dimensional Li2S growth is more favored due to an increased Li2S dissociation. As a result, high DN salt anions lead to ~95 % sulfur utilization. More importantly, the electrolytes with high-DN salt anions are notably compatible with Li metal electrode. The approach enables a high sulfur-loaded Li-S battery with areal capacity larger than 4 mAh cm-2 and high sulfur utilizations above 90 %. |
