| 초록 |
Lithium-sulfur batteries (LSBs) are considered the most promising alternative to the current-state-of-the-art lithium ion batteries (LIBs). Suppression of the polysulfide shuttling while maintaining high sulfur content is a significant challenge for their practical application. Here we report a new class of sulfur host material, 2D siloxene (Si6H3(OH)3), that features oxygen-rich 2D surfaces and slit-like micropores (~0.3 nm) appropriate for trapping of the intermediate polysulfides. 2D layered siloxene (2DSI) is simply prepared by Ca2+ extraction from CaSi2 by using concentrated HCl solution and used as a sulfur host material without further treatment. Lithium polysulfide batteries employing carbon cloth cathode loaded with 2DSI (4 mg/cm2) achieved a high areal capacity of ~6.5mAh/cm2 after 100cycle at 0.1C with a sulfur loading of 10 mg/cm2. The capacity loss is 0.003% per cycle, which is superior to most of sulfur host materials. |
