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Dynamic Water Promotes Lithium-Ion Transport in Superconcentrated and Eutectic Aqueous Electrolytes

Title
Dynamic Water Promotes Lithium-Ion Transport in Superconcentrated and Eutectic Aqueous Electrolytes
Author(s)
Kim, JungyuKoo, BonhyeopLim, JoonhyungJeon, JongguLim, ChaihoLee, HochunKwak, KyungwonCho, Minhaeng
Issued Date
2022-01
Citation
ACS Energy Letters, v.7, no.1, pp.189 - 196
Type
Article
Keywords
DIELECTRIC-RELAXATIONHYDRATIONSPECTROSCOPYMECHANISMNETWORKANIONSIR
ISSN
2380-8195
Abstract
Superconcentrated aqueous electrolytes have shown promise as safe and high-voltage lithium-ion battery (LIB) electrolytes. However, the interplay of lithium-ion solvation structure and dynamics with fast Li-ion transport has not been elucidated yet. Here, we combine the ultrafast femtosecond mid-IR spectroscopy, dielectric relaxation spectroscopy, pulsed-field gradient NMR, and molecular dynamics simulation for investigating the solvation structure and Li-ion transport mechanism in superconcentrated aqueous electrolytes. We found the existence of water molecules with vibrational and rotational properties very similar to those of bulk water, even at extremely high salt concentrations (28 m). Our experimental results show that the electrolytes have a heterogeneous solvation environment, and bulk-like water molecules promote fast Li-ion transport. We anticipate that the molecular understanding of the superconcentrated aqueous electrolytes obtained here would facilitate the design of solvation structures to overcome the limit of dilute LIB electrolytes. © 2021 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/16033
DOI
10.1021/acsenergylett.1c02012
Publisher
American Chemical Society
Related Researcher
  • 이호춘 Lee, Hochun
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
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Department of Energy Science and Engineering Electrochemistry Laboratory for Sustainable Energy(ELSE) 1. Journal Articles

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