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

Kyung-Koo Lee, Kwanghee Park, Hochan Lee, Yohan Noh, Dorota Kossowska, Kyungwon Kwak () and Minhaeng Cho ()
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Kyung-Koo Lee: Kunsan National University
Kwanghee Park: Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University
Hochan Lee: Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University
Yohan Noh: Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University
Dorota Kossowska: Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University
Kyungwon Kwak: Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University
Minhaeng Cho: Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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···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.

Date: 2017
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DOI: 10.1038/ncomms14658

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