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Enhanced lithium-ion transport in organosilyl electrolytes for lithium-ion battery applications

Published online by Cambridge University Press:  30 September 2019

Leslie J. Lyons ,
Scott Beecher ,
Evan Cunningham ,
Tom Derrah ,
Shengyi Su ,
Junmian Zhu ,
Monica Usrey ,
Adrián Peña-Hueso ,
Tobias Johnson  and
Robert West
Leslie J. Lyons*
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA 50112, USA
Scott Beecher
Affiliation:
1252 University of Oregon, Eugene, OR 97403-1252, USA
Evan Cunningham
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA 50112, USA
Tom Derrah
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA 50112, USA
Shengyi Su
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA 50112, USA
Junmian Zhu
Affiliation:
Department of Chemistry, Grinnell College, Grinnell, IA 50112, USA
Monica Usrey
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI 53706, USA
Adrián Peña-Hueso
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI 53706, USA
Tobias Johnson
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI 53706, USA
Robert West
Affiliation:
Silatronix Inc., 3587 Anderson Street, Suite 108, Madison, WI 53706, USA
*
Address all correspondence to Leslie J. Lyons at lyons@grinnell.edu
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Abstract

The authors report on 7Li, 19F, and 1H pulsed field gradient NMR measurements of 26 organosilyl nitrile solvent-based electrolytes of either lithium bis(trifluorosulfonyl)imide (LiTFSI) or lithium hexafluorophosphate. Lithium transport numbers (as high as 0.50) were measured and are highest in the LiTFSI electrolytes. The authors also report on solvent blend electrolytes of fluoroorganosilyl (FOS) nitrile solvent mixed with ethylene carbonate (EC) and diethyl carbonate. Solvent diffusion measurements on an electrolyte with 6% FOS suggest both the FOS and EC solvate the lithium cation. By comparing lithium transport and transference numbers, the authors find less ion pairing in FOS nitrile carbonate blend electrolytes and difluoroorganosilyl nitrile electrolytes.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 3 , September 2019 , pp. 985 - 991
Copyright
Copyright © Materials Research Society 2019 

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