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Tailoring ion-conducting interphases on magnesium metals for high-efficiency rechargeable magnesium metal batteries

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Title
Tailoring ion-conducting interphases on magnesium metals for high-efficiency rechargeable magnesium metal batteries
Author(s)
Hyeokjun Park; Hyung-Kyu Lim; Si Hyoung Oh; Jooha Park; Hee-Dae Lim; Kisuk Kang
Publication Date
2020-12
Journal
Acs Energy Letters, v.5, no.12, pp.3733 - 3740
Publisher
AMER CHEMICAL SOC
Abstract
Magnesium (Mg) rechargeable batteries are one of the promising highenergy post-lithium battery chemistries exploiting the multivalent charge carrier. However, the use of magnesium metal has been challenging due to the formation of the ion-blocking passivation layer on magnesium metal in most organic electrolytes. Herein, we propose a new strategy to transform the passivating film into a Mg2+- conductive interphase via simple chemisorption of sulfur dioxide molecules on magnesium metal. The facile chemical tuning converts the magnesium oxide-based passivation layer into a magnesium sulfate-like phase, which greatly enhances the chargetransfer capability of multivalent Mg2+ ions. The reduced surface resistance of the magnesium metal results in efficient magnesium stripping/deposition reactions even under conventional ether-based electrolytes. Theoretical calculations support that the facile ionic conduction is attributed to the relatively low Mg2+ dissociation and migration energies in the tailored interphases. Furthermore, we elucidate the degradation mechanism of magnesium electrodes by combining various experimental analyses with computational calculations.
URI
https://pr.ibs.re.kr/handle/8788114/12099
DOI
10.1021/acsenergylett.0c02102
ISSN
2380-8195
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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