Electrolyte additives to enable nonaqueous polyelectrolyte solutions for lithium ion batteries
Date Published |
07/2019
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Publication Type | Journal Article
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Authors | |
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DOI |
10.1039/c9me00067d
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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. |
Journal |
Molecular Systems Design & Engineering
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Volume |
5
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Year of Publication |
2020
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Issue |
1
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Pagination |
91 - 96
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Short Title |
Mol. Syst. Des. Eng.
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Refereed Designation |
Refereed
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Organizations | |
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