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나노의학 연구단
나노의학 연구단
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Sparked Reduced Graphene Oxide for Low-Temperature Sodium Beta Alumina Batteries

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Title
Sparked Reduced Graphene Oxide for Low-Temperature Sodium Beta Alumina Batteries
Author(s)
Dana Jin; Hae Gon Lee; Sangjin Choi; Sungsoon Kim; Younki Lee; Sori Son; Yoon-Cheol Park; Joon Sang Lee; Keeyoung Jung; Wooyoung Shim
Publication Date
2019-12
Journal
NANO LETTERS, v.19, no.12, pp.8811 - 8820
Publisher
AMER CHEMICAL SOC
Abstract
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. © 2019 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/6709
ISSN
1530-6984
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > Journal Papers
Files in This Item:
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