journal article·2015-01-27Open access

Phase Behavior and Electrochemical Characterization of Blends of Perfluoropolyether, Poly(ethylene glycol), and a Lithium Salt

Dominica H. C. Wong, Alessandra Vitale, Didier Devaux, Austria Taylor, Ashish A. Pandya, Daniel T. Hallinan, Jacob L. Thelen, Sue J. Mecham, Simon F. Lux, Alexander M. Lapides, Paul R. Resnick, Thomas J. Meyer, Robert M. Kostecki, Nitash P. Balsara, Joseph M. DeSimone

Chemistry of Materials· Volume 27· Issue 2

Abstract

Electrolytes consisting of low molecular weight perfluoropolyether (PFPE), poly(ethylene glycol) (PEG), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) blends were prepared and systematically studied for salt concentration and stoichiometry effects on the materials’ thermal and electrochemical properties. Herein we report that the tunable ratios of PFPE and PEG allow for precise control of crystalline melting and glass transition temperature properties. These blended liquid polymer electrolytes are inherently nonflammable and remain stable in the amorphous phase from approximately 150 °C down to −85 °C. The ionic conductivity of the electrolytes are on the order of 10 –4 S/cm at 30 °C, which makes them suitable for rechargeable lithium batteries.
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Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Dielectric materials and actuators

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States

Department of Applied Science and Technology, Politecnico di Torino, Torino 10129, Italy

Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, United States

Department of Chemical Engineering, University of California, Berkeley, California 94720, United States

FluoroScience LLC, Alexandria, Virginia 22314, United States

Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States

Funding

National Science Foundation · Consorzio INSTM · Office of Naval Research · Natural Sciences and Engineering Research Council of Canada · Vehicle Technologies Program · Basic Energy Sciences

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