| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
특별심포지엄 1. 차세대 이차전지 소재기술 심포지엄-오거나이저: 김종순(성균관대), 류원희(숙명여대) |
| 제목 |
Tailoring ion-conducting interphases on Mg metals for high-efficiency rechargeable magnesium batteries |
| 초록 |
Magnesium (Mg) rechargeable batteries are one of the promising high-energy post-lithium battery chemistries exploiting the multivalent charge carrier. However, the use of Mg metal as an anode has been challenging due to the formation of Mg2+ ion-blocking passivation layer on Mg metal in most organic electrolytes for Mg batteries. This bottleneck required the use of only special electrolyte system with highly corrosive nature, which significantly impeded the development of Mg rechargeable batteries. Herein, we propose a new strategy to transform the passivating film into a Mg2+-conductive interphase via simple chemisorption of sulfur dioxide molecules on Mg metal. The simple chemical tuning in the electrochemical cell converts the magnesium oxide-based passivation layer into magnesium sulfate, which greatly enhances the charge-transfer capability for multivalent Mg2+ ions. The reduced surface resistance of the Mg metal anode results in efficient Mg stripping/deposition reactions even when using conventional ether-based electrolytes. Density functional theory 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 Mg electrodes by combining various experimental analyses with computational calculations. This study offers new guidelines for the rational design of interphase for reversible Mg metal batteries. |
| 저자 |
박혁준1, 임형규2, 임희대3, 강기석4
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| 소속 |
1한국표준과학(연), 2강원대, 3한국과학기술(연), 4서울대 |
| 키워드 |
<P>Magnesium metal; battery; interphase; chemisorption; MgO; SO2</P>
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| E-Mail |
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