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

Published online by Cambridge University Press:  26 September 2019

Leslie J. Lyons ,
Tom Derrah ,
Steven Sharpe ,
Seiyoung Yoon ,
Scott Beecher ,
Monica Usrey ,
Adrián Peña-Hueso ,
Tobias Johnson  and
Robert West
Leslie J. Lyons*
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA50112, USA
Tom Derrah
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA50112, USA
Steven Sharpe
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA50112, USA
Seiyoung Yoon
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA50112, USA
Scott Beecher
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA50112, USA
Monica Usrey
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI53706, USA
Adrián Peña-Hueso
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI53706, USA
Tobias Johnson
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI53706, USA
Robert West
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI53706, USA
*
Address all correspondence to Leslie J. Lyons at [email protected]
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Abstract

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 LiPF6 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.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 4 , December 2019 , pp. 1200 - 1205
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Copyright
Copyright © Materials Research Society 2019

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