| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Solid-State Li-S batteries based on borohydride solid electrolyte. |
| 초록 | The development of better batteries is paramount for the spread of renewable electricity production and utilisation. Limited improvements are expected for lithium-ion battery, because of the use of organic liquid electrolytes. An alternative is to use solid electrolyte instead. The high temperature (＞ 383 K) phase of lithium-borohydride, is a fast Li+ conductor. The fast conduction is kept at room temperature by stabilizing the phase via solid solution with Li-halides or confinement of LiBH4 in nano-porous scaffolds. We have characterizes solid-state lithium-sulfur batteries based on nano-confined LiBH4 in mesoporous silica as solid electrolytes. The nano-confined LiBH4 has fast ionic lithium conductivity at room temperature, 0.1 mScm−1, negligible electronic conductivity and its cationic transport number (t+ = 0.96), close to unity, demonstrates a purely cationic conductor. The electrolyte has an excellent stability against lithium metal. The behavior of the batteries is studied by cyclic voltammetry and repeated charge/discharge cycles in galvanostatic conditions. The batteries show very good performance, delivering high capacities versus sulfur mass, typically 1220 mAhg−1 after 40 cycles at moderate temperature (55◦C), 0.03 C rates and working voltage of 2 V. In the Voltammogram, the compelling absence of characteristic discharge plateaus from 2Li+S+2e-＞LixSy+…-＞Li2S reaction (at 2V and 2.4 V vs Li/Li+) indicates faster kinetic in comparison with previously reported Li-S cells |
| 저자 | Didier Blanchard |
| 소속 | Technical Univ. of Denmark |
| 키워드 | Li-S; solid state battery; borohydride |
