| 학회 | 한국재료학회 |
| 학술대회 | 2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트) |
| 권호 | 24권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Preparation and electrochemical properties of LiF-added Li7La3Zr2O12 Solid electrolyte |
| 초록 | Currently, lithium secondary batteries use electrolytes in the form of liquids or gels, which have problems such as electrolyte leakage, low thermal stability, and the risk of expansion and explosion at high temperatures. To overcome these problems, all solid lithium secondary batteries with high stability, high reliability and high energy density have started to attract attention as next generation batteries. Among the solid electrolyte materials, Li7La3Zr2O12 (LLZO) having a garnet structure is an excellent electrolyte material with chemical and thermal stability due to low reactivity with Li metal which is an electrode layer. In order to produce LLZO, however, a high temperature of 1200℃ or more is required. With the heat treatment at high temperature, it is known that lithium volatilization and phase transition take place. Therefore, it is necessary to synthesize LLZO with cubic phase at relatively low temperature and to improve Li ionic conductivity. In this study, a co-precipitation method to synthesize a cubic phase of LLZO with small particle size was designed. Also LiF was added to improve the ionic conductivity and its properties were investigated. The Li ion conductivity through the powder molding to a disc by CIP and the sintering at high temperature was measured. As a result, relative density of the sintered LLZO disc was estimated to 93%. On the other hand, its ionic conductivity at room temperature was calculated to 4.08 x 10-4 S/cm. |
| 저자 | 조희구1, 이주연2, 안기석1, 이선숙3, 전형탁1, 정하균1 |
| 소속 | 1한국화학(연), 2한양대, 3고려대 |
| 키워드 | <P>Li-ion battery; Solid electrolyte</P> |
