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Electrolyte additives to enable nonaqueous polyelectrolyte solutions for lithium ion batteries

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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

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Publication details

The article was received on 28 May 2019, accepted on 01 Jul 2019 and first published on 01 Jul 2019


Article type: Communication
DOI: 10.1039/C9ME00067D
Mol. Syst. Des. Eng., 2020, Advance Article

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    Electrolyte additives to enable nonaqueous polyelectrolyte solutions for lithium ion batteries

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

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