期刊
NANO LETTERS
卷 19, 期 12, 页码 8811-8820出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03646
关键词
sodium-beta alumina battery; sparked reduced graphene oxide; liquid metal wetting
类别
资金
- National Research Foundation (NRF) of Korea through the Korean government [2018M3D1A1058793, ERC-2015R1A5A1037668, 2016M3A7B4910798]
- International Collaborative Energy Technology R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20158510050010]
- Institute for Basic Science [IBS-R026-D1]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20158510050010] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016M3A7B4910798] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Wetting Na metal on the solid electrolyte of a liquid Na battery determines the operating temperature and performance of the battery. At low temperatures below 200 degrees C, liquid Na wets poorly on a solid electrolyte near its melting temperature (T-m = 98 degrees C), limiting its suitability for use in low-temperature batteries used for large-scale energy-storage systems. Herein, we propose the use of sparked reduced graphene oxide (rGO) that can improve the Na wetting in sodium-beta alumina batteries (NBBs), allowing operation at lower temperatures. Experimental and computational studies indicated rGO layers with nanogaps exhibited complete liquid Na wetting regardless of the surface energy between the liquid Na and the graphene oxide, which originated from the capillary force in the gap. Employing sparked rGO significantly enhanced the cell performance at 175 degrees C; the cell retained almost 100% Coulombic efficiency after the initial cycle, which is a substantial improvement over cells without sparked rGO. These results suggest that coating sparked rGO is a promising but simple strategy for the development of low-temperature NBBs.
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