Cited 19 time in webofscience Cited 20 time in scopus

Safe, Stable Cycling of Lithium Metal Batteries with Low-Viscosity, Fire-Retardant Locally Concentrated Ionic Liquid Electrolytes

Title
Safe, Stable Cycling of Lithium Metal Batteries with Low-Viscosity, Fire-Retardant Locally Concentrated Ionic Liquid Electrolytes
Authors
Lee, Suk HyungPark, KisungKoo, BonhyeopPark, ChanghunJang, MinchulLee, HongkyungLee, Hochun
DGIST Authors
Lee, Suk Hyung; Park, Kisung; Koo, Bonhyeop; Park, Changhun; Jang, Minchul; Lee, HongkyungLee, Hochun
Issue Date
2020-08
Citation
Advanced Functional Materials, 30(35), 2003132
Type
Article
Article Type
Article
Author Keywords
Coulombic efficiencyionic liquidslithium dendriteslithium metal batteriessafety
Keywords
PERFORMANCESOLVATIONTRANSPORTDENSITYLI-METALTRANSFERENCE NUMBERSETHYLENE CARBONATEBIS(FLUOROSULFONYL)IMIDEELECTRODESSPECTROSCOPY
ISSN
1616-301X
Abstract
Ionic liquid (IL) electrolytes with concentrated Li salt can ensure safe, high-performance Li metal batteries (LMBs) but suffer from high viscosity and poor ionic transport. A locally concentrated IL (LCIL) electrolyte with a non-solvating, fire-retardant hydrofluoroether (HFE) is presented. This rationally designed electrolyte employs lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), 1-methyl-1-propyl pyrrolidinium bis(fluorosulfonyl)imide (P13FSI) and 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE) as the IL and HFE, respectively (1:2:2 by mol). Adding TTE enables a Li-concentrated IL electrolyte with low viscosity and good separator wettability, facilitating Li-ion transport to the Li metal anode. The non-flammability of TTE contributes to excellent thermal stability. Furthermore, synergy between the dual (FSI/TFSI) anions in the LCIL electrolyte can help modify the solid electrolyte interphase, increasing Li Coulombic efficiency and decreasing dendritic Li deposition. LMBs (Li||LiCoO2) employing the LCIL electrolyte exhibit good rate capability (≈89 mAh g−1 at 1.8 mA cm−2, room temperature) and long-term cycling (≈80% retention after 400 cycles). © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/12654
DOI
10.1002/adfm.202003132
Publisher
John Wiley & Sons Ltd.
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • 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
Files:
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Collection:
Department of Energy Science and EngineeringElectrochemical Materials & Devices Laboratory1. Journal Articles
Department of Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles


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