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

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 solv...

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Bibliographic Details
Published in:Nature communications 2017-03, Vol.8 (1), p.14658-14658, Article 14658
Main Authors: Lee, Kyung-Koo, Park, Kwanghee, Lee, Hochan, Noh, Yohan, Kossowska, Dorota, Kwak, Kyungwon, Cho, Minhaeng
Format: Article
Language:English
Subjects:
140/125
639/301/1005/190
639/301/299/161/891
639/638/298/917
639/638/440/527/2257
Chemistry
Electrolytes
Fourier transforms
Humanities and Social Sciences
Lithium
multidisciplinary
Protons
Science
Science (multidisciplinary)
Solvents
Viscosity
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Summary: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. The lithium solvation structure in the electrolyte solution for lithium-ion batteries has not been fully understood. Here, the authors show ultrafast fluxional exchange of carbonate solvent molecules in and out of lithium-ion solvation sheath utilizing coherent two-dimensional infrared spectroscopy.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms14658