Enhancing ionic conductivity with fluorination in organosilyl solvents for lithium-ion battery electrolytes

Increasing fluorination of organosilyl nitrile solvents improves ionic conductivities of lithium salt electrolytes, resulting from higher values of salt dissociation. Ionic conductivities at 298 K range from 1.5 to 3.2 mS/cm for LiPF 6 salt concentrations at 0.6 or 0.7 M. The authors also report on...

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Bibliographic Details
Published in:MRS communications 2019-12, Vol.9 (4), p.1200-1205
Main Authors: Lyons, Leslie J., Derrah, Tom, Sharpe, Steven, Yoon, Seiyoung, Beecher, Scott, Usrey, Monica, Peña-Hueso, Adrián, Johnson, Tobias, West, Robert
Format: Article
Language:English
Subjects:
Biomaterials
Characterization and Evaluation of Materials
Conductivity
Electrolytes
Fluorination
Ion currents
Lithium
Lithium-ion batteries
Materials Engineering
Materials Science
Nanotechnology
Polymer Sciences
Rechargeable batteries
Research Letter
Solvents
Spectrum analysis
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Summary:Increasing fluorination of organosilyl nitrile solvents improves ionic conductivities of lithium salt electrolytes, resulting from higher values of salt dissociation. Ionic conductivities at 298 K range from 1.5 to 3.2 mS/cm for LiPF 6 salt concentrations at 0.6 or 0.7 M. The authors also report on solvent blend electrolytes where the fluoroorganosilyl (FOS) nitrile solvent is mixed with ethylene carbonate and diethyl carbonate. Ionic conductivities of the FOS solvent/carbonate blend electrolytes increase achieving ionic conductivities at 298 K of 5.5–6.3 mS/cm and salt dissociation values ranging from 0.42 to 0.45. Salt dissociation generally decreases with increasing temperature.
ISSN:2159-6859
2159-6867
DOI:10.1557/mrc.2019.131