| 학회 | 한국재료학회 |
| 학술대회 | 2013년 가을 (11/06 ~ 11/08, 제주롯데호텔) |
| 권호 | 19권 2호 |
| 발표분야 | C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 | Enhanced performance of Monoclinic Sulfur Nanowire Array for Lithium Sulfur battery |
| 초록 | As advanced portable electronic devices and hybrid electric vehicles (HEVs) have penetrated into our everyday lives, the demand for high energy rechargeable batteries has continuously grown. The current lithium-ion batteries (LIBs) rely on intercalation-based electrodes, such as graphite anodes and lithium metal oxide cathodes and can thus offer only limited practical energy densities around ~150 Wh kg-1 in real applications. Therefore, alternative rechargeable battery systems whose energy densities can go beyond those of LIBs have been extensively pursued. Elemental sulfur (S) is a promising cathode material for a number of desirable properties. Sulfur cathodes have a theoretical specific capacity of 1675 mAh g-1 with very high specific energy density of 2500 Wh kg-1. Moreover, using sulfur as the cathode material for batteries has many other advantages such as low cost, abundant, environmental benignity and widespread availability Despite the considerable promises, a number of significant challenges need to be solved for the commercialization; intrinsic poor electrical conductivity of sulfur (5 × 10-30 Scm-1 at 25 oC), dissolution of polysulfides (Li2Sx, 4≤x≤8) in electrolyte and large volumetric expansion of sulfur. In the present investigation, we developed a sulfur electrode focusing on electrode design. In the electrode design perspective, sulfur was completely covered by minimal amount of carbon, and the carbon coated sulfur nanowire was highly aligned. The electrode design address all of the aforementioned issues at once and result in excellent electrical performance: a specific capacity reaching the theoretical value, substantial capacity retention over 1000 cycles, and rate capability with ＜1 min discharge time were achieved. Furthermore, these battery performances were achieved under the highest sulfur content to date: ~81 wt% in the active material. |
| 저자 | 문산, 정영화, 정욱기, 김도경 |
| 소속 | 한국과학기술원 |
| 키워드 | sulfur; AAO |
