| 학회 | 한국재료학회 |
| 학술대회 | 2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 | 26권 1호 |
| 발표분야 | 특별심포지엄6. 차세대 배터리 심포지엄-오거나이저: 김종순(세종대) |
| 제목 | Approaches to enable rechargeable nonaqueous multivalent-ion batteries |
| 초록 | The high volumetric energy density of rechargeable Mg batteries (RMBs) gives them a competitive advantage over current Li ion batteries. It originates from the high volumetric capacity (3,833 mAh cm−3) of bivalent Mg metal anodes, which is approximately 1.9 times higher than that of Li metal (2,046 mAh cm-3). In addition, the bio-abundant and relatively non-toxic Mg metal has been reported to be free from alleviate dendritic metal growth. However, the formation of ion-insulating interphase on the surface of Mg metal in common organic electrolytes impedes transports of multivalent ions, which has been a problematic issue for Mg metal batteries. Herein, we propose a new strategy to tailor the passivating film into Mg2+-conductive interphase by means of a simple chemisorption of sulfur dioxide molecules on Mg metal. The simple chemical tuning could convert the passivation layer of magnesium oxide into magnesium sulfate, and remarkably enhances the charge transfer ability for multivalent Mg2+ ions. The reduced surface resistance of Mg metal anode enables the efficient Mg stripping/deposition reactions even in the use of conventional ethereal electrolytes, which readily forms ionic passivation layer on Mg metal. Density functional studies elucidate that the facile ionic conduction is attributed to the relatively low Mg2+ dissociation and migration energies in the tailored interphases. Furthermore, we investigate the degradation mechanism of Mg metals by combining the various experimental analyses with computational calculations. This study offers a new insight to understand the role of interphase and provides a guideline to design a better interphase for reversible Mg metal batteries. |
| 저자 | 임희대 |
| 소속 | 한국과학기술(연) |
| 키워드 | multivalent-ion batteries; Mg-ion battery; energy storage material |
