標題: | Mitigating Metal Dendrite Formation in Lithium-Sulfur Batteries via Morphology-Tunable Graphene Oxide Interfaces |
作者: | Chen, Yu-Ting Abbas, Syed Ali Kaisar, Nahid Wu, Sheng Hui Chen, Hsin-An Boopathi, Karunakara Moorthy Singh, Mriganka Fang, Jason Pao, Chun-Wei Chu, Chih-Wei 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | graphene oxide;lithium dendrites;lithium metal anodes;lithium-sulfur batteries;Li-S batteries |
公開日期: | 16-一月-2019 |
摘要: | Despite issues related to dendrite formation, research on Li metal anodes has resurged because of their high energy density. In this study, graphene oxide (GO) layers are decorated onto Li metal anodes through a simple process of drop-casting and spray-coating. The self-assembly of GO is exploited to synthesize coatings having compact, mesoporous, and macroporous morphologies. The abilities of the GO coatings to suppress dendrite formation are compared through Li vertical bar Li symmetrical cell charging at a current density of 5 mA cm(-2) for 2000 cycles-a particularly abusive test. The macroporous structure possesses the lowest impedance, whereas the compact structure excels in terms of stability. Moreover, GO exhibits a low nucleation overpotential and is transformed into reduced GO with enhanced conductivity during the operation of the cells; both factors synergistically mitigate the issue of dendrite formation. Li-S batteries incorporating the GO-decorated Li anodes exhibit an initial capacity of 850 mA h g(-1) and maintain their stability for 800 cycles at a C-rate of 1 C (1675 mA h g(-1)), suggesting the applicability of GO in future rechargeable batteries. |
URI: | http://dx.doi.org/10.1021/acsami.8b18379 http://hdl.handle.net/11536/148742 |
ISSN: | 1944-8244 |
DOI: | 10.1021/acsami.8b18379 |
期刊: | ACS APPLIED MATERIALS & INTERFACES |
Volume: | 11 |
起始頁: | 2060 |
結束頁: | 2070 |
顯示於類別: | 期刊論文 |