Ultrafast fluxional exchange dynamics in electrolyte solvation sheath of lithium ion battery

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Title
Ultrafast fluxional exchange dynamics in electrolyte solvation sheath of lithium ion battery
Author(s)
Kyung-Koo Lee; Kwanghee Park; Hochan Lee; Yohan Noh; Dorota Kossowska; Kyungwon Kwak; Minhaeng Cho
Publication Date
2017-03
Journal
NATURE COMMUNICATIONS, v.8, no., pp.14658 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Lithium cation is the charge carrier in lithium-ion battery. Electrolyte solution in lithium-ion battery is usually based on mixed solvents consisting of polar carbonates with different aliphatic chains. Despite various experimental evidences indicating that lithium ion forms a rigid and stable solvation sheath through electrostatic interactions with polar carbonates, both the lithium solvation structure and more importantly fluctuation dynamics and functional role of carbonate solvent molecules have not been fully elucidated yet with femtosecond vibrational spectroscopic methods. Here we investigate the ultrafast carbonate solvent exchange dynamics around lithium ions in electrolyte solutions with coherent two-dimensional infrared spectroscopy and find that the time constants of the formation and dissociation of lithium-ion center dot center dot center dot carbonate complex in solvation sheaths are on a picosecond timescale. We anticipate that such ultrafast microscopic fluxional processes in lithium-solvent complexes could provide an important clue to understanding macroscopic mobility of lithium cation in lithium-ion battery on a molecular level ⓒ The Author(s) 2017
URI
https://pr.ibs.re.kr/handle/8788114/3586
ISSN
2041-1723
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
Files in This Item:
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