| 학회 | 한국재료학회 |
| 학술대회 | 2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 | 26권 1호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Suppressing dendritic Lithium growth via lignin derived functional materials |
| 초록 | High energy storage device having high energy density is demanded to meet the increasing energy consumption. Among rising candidates, Li metal batteries are the most promising next generation secondary batteries because Li metal anode exhibits high theoretical capacity, lowest electrochemical potential, and lightest density. Despite the Li metal anode has vastly studied since their extraordinary properties, there are unsolved obstacles e.g., formation of unstable SEI layer owing to the side reaction that the Li metal with electrolytes and short circuit causing undesired dendritic growth leads low cycle life still pending. To suppressed the dendrite growth, various studies have been reported that not only protecting infinite volume expansion during repeated Li plating-stripping but also inducing homogeneous Li plating via exploiting either 3D structured materials or materials having good affinity with Li+. In this perspective, Lignin is attracting great attention due to fascinating properties such as cost-effective and abundant complicated 3D structured polymer materials derive from plant. Moreover, this unique 3D structured materials can be easily tuned their chemical properties by facile reforming process. In this study, we suggest that 3D structured kraft lignin with lithiophilic functional groups. Kraft lignin with lithiophilic functional group exhibits superior thermal stability and higher molecular weight compares than kraft lignin. Moreover, due to lithiophilic functional group, the lignin which enhanced Li+ affinity suppresses dendrite growth by inducing stable electrochemical operation. Therefore, the modified kraft lignin shows high coulombic efficiency (CE) of 98% at 200 cycle, whereas the pristine Cu foil and kraft lignin occur short circuit after few repeated cycle operation with low CE. This results demonstrate that 3D lithiophilic layers consisting of modified kraft lignin offer the uniform Li deposition to Li-metal electrodes, leading the suppressing of dendritic Li growth. Keywords: Lignin, Li metal batteries, dendrite suppression |
| 저자 | 권혜민1, 강신준1, 김문경1, 김용식2, 정형모1 |
| 소속 | 1성균관대, 2강원대 |
| 키워드 | Lignin; Li metal batteries; dendrite suppression |
