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Deterministic growth sodium metal anode on pre-patterned current collector for highly rechargeable seawater battery

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Title
Deterministic growth sodium metal anode on pre-patterned current collector for highly rechargeable seawater battery
Other Titles
가역적 해수 전지를 위한 음극으로 패턴 집전체 위의 선택적 소듐 금속 성장 개발
Author
Jung, Jaeho
Advisor
Kang, Seok Ju
Issue Date
2020-08
Publisher
Graduate School of UNIST
Abstract
Anode–free seawater batteries have emerged as a prospective candidate for next-generation energy-storage cells because of their unique discharge and charge characteristics. To fulfill this promise, reliable Na metal plating on the current collector surface is an important requirement for improving electrochemical properties. Here, we develop a strategy for deterministic growth of Na metal on a pre-patterned current collector. The different surface energies of the Cu and Al metal surfaces enable the growth of patterned Na islands during electrochemical deposition, which efficiently form a film-like layer of Na metal. In particular, determining an optimum ratio between the metal-pattern diameter and the distance between adjacent pattern edges is the critical factor for producing decent Na metal pattern array that can facilitate the enhancement of Coulombic efficiency and cycling capability of a half-cell structure. Moreover, patterned growth of Na metal is highly beneficial to enhancement of the electrochemical performance of seawater batteries. By using a Na super-ionic conductor separator with a Cu/Al pre-patterned current collector, well-patterned growth of Na islands with improved cycling stability for over 200 cycles can be obtained for anode–free seawater battery.
Description
Department of Energy Engineering (Battery Science and Technology)
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