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  • 02월 28일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Nanometric Water Channels in Water-in-Salts Electrolytes of Li-Ion Battery observed with 2D-IR Spectroscopy.

등록일
2019년 1월 26일 17시 29분 55초
접수번호
2836
발표코드
PHYS3-2 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 15시 : 00분
발표형식
심포지엄
발표분야
Physical Chemistry - Physical Chemistry Approaches in Energy and Environmental Materials
저자 및
공동저자
Kyungwon Kwak*, Minhaeng Cho*
Department of Chemistry, Korea University, Korea

Two-dimensional infrared spectroscopy (2D-IR) and polarization selective pump-probe spectroscopy (IR-PP) has been applied to study various chemical and biological processes with femtosecond time resolution. Recently, our group extends research interest into solvation dynamics in non-aqueous organic electrolyte system used in commercial Li-ion battery of electrolytes as well as in highly concentrated aqueous electrolytes for advanced energy storage system Electrolytes are ubiquitous and indispensable in all electrochemical devices including electrolytic cells, capacitors, fuel cells, or batteries. Their function is the same in devices for serving as the medium for the ion transport between electrodes. The electrolyte determines how fast the energy could be released by controlling the rate of mass flow within the battery. Thus, it has been suggested that the solvation structures and dynamics of Li ions in liquid electrolyte play an essential role to Li-based battery performance. Lithium ions in highly concentrated aqueous electrolyte used in lithium-ion battery (LIB) shows unexpectedly high ion mobility despite high viscosity of the concentrated electrolyte. Here, carrying out femtosecond IR pump-probe and two-dimensional IR spectroscopy studies, we show that a considerable amount of water even in highly concentrated electrolyte solutions exhibits bulk-like water properties and forms hydrogen-bonding network wire structures with nanometer diameters. Furthermore, time-resolved rotational anisotropy, spectral diffusion dynamics, and molecular dynamics simulations of water indicate the presence of interfacial water on ion aggregate networks that helps reducing electrostatic friction of hydrated lithium ions, resulting in an unexpectedly rapid transport of lithium ions.


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