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