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제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Magnesium aluminate triflate complex (MATC) as a new electrolyte system with wide electrochemical window for magnesium ion batteries

등록일
2017년 8월 24일 11시 53분 54초
접수번호
1566
발표코드
ELEC.P-478 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 20일 (금요일) 13:00~14:30
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Amol Bhairuba Ikhe, myoungho pyo1,*
Department of Printed Electronics Engineering, Suncheon National University, India
1Department of Printed Electronics Engineering, Suncheon National University, Korea
Magnesium (Mg) ion battery has attracted much attention in the past two decades due to its high theoretical volumetric capacity (3833mAh/cm3) compared to lithium ion battery [850mAh/cm3 (Graphite anode)]. There are two major issues in developing the Mg rechargeable batteries, which are: (i) relatively narrow potential windows of Mg2+-based electrolytes; (ii) slow diffusion of Mg2+ ions in active materials. The first successful Mg deposition/dissolution in Mg2+ electrolytes was reported by Aurbach group, using Mg organohaloaluminate salts (APC). Inspired by this seminal work, researchers tried to increase the potential window (up to 2.3 V vs. Mg in APC-type) and to replace the toxic Grignard-based electrolytes. Various non-Grignard type electrolytes such as MgCl2-AlCl3 (MACC), Mg(HMDS)2-AlCl3 and MgCl2-Mg(TFSI)2 have been reported. However, these electrolyte systems show relatively lower anodic limit, poor coulombic efficiency and/or battery performance. Herein, we report the combinations of magnesium triflate (MgTf2) and Lewis acid AlCl3 in ether type solvent (Diglyme) which displayed reversible Mg plating/stripping, high anodic limits, and good reversible Mg2+ insertion/de-insertion for the Mo6S8 cathode. The system we evaluated can be represented as xM MgTf2 + yM AlCl3/Diglyme and the active species [Mg2Cl3+] was identified and confirmed by ESI-mass spectroscopy. Electrochemical stability of electrolyte and cyclic stability of Mo6S8 in this electrolyte were studied.

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