Issue 1, 2020

Electrolyte additives to enable nonaqueous polyelectrolyte solutions for lithium ion batteries

Abstract

Nonaqueous polyelectrolyte solutions, in which a negatively charged macromolecule neutralized by lithium is dissolved in nonaqueous solvents, have shown promise as potential high transference number electrolytes. However, in battery-relevant carbonate solvents (ethylene carbonate/dimethyl carbonate blends), it has been shown that lithium ions do not readily dissociate from easily synthesized sulfonated polymers, despite the solvent's high dielectric constant (∼50). In this work, a range of additives are screened to improve conductivity, and we demonstrate that the addition of less than 5 vol% of 15-crown-5 achieves an order of magnitude conductivity increase by selectively improving lithium dissociation. Utilizing the optimized electrolyte, we show that polyelectrolyte solutions may be directly substituted for a standard electrolyte with commercial electrodes in a graphite/LiFePO4 cell, providing further motivation for future study of these new electrolytes.

Graphical abstract: Electrolyte additives to enable nonaqueous polyelectrolyte solutions for lithium ion batteries

Article information

Article type
Communication
Submitted
28 Тра 2019
Accepted
01 Лип 2019
First published
01 Лип 2019

Mol. Syst. Des. Eng., 2020,5, 91-96

Author version available

Electrolyte additives to enable nonaqueous polyelectrolyte solutions for lithium ion batteries

K. M. Diederichsen and B. D. McCloskey, Mol. Syst. Des. Eng., 2020, 5, 91 DOI: 10.1039/C9ME00067D

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