Effect of Anion Size on Conductivity and Transference Number of Perfluoroether Electrolytes with Lithium Salts
Abstract
Mixtures of perfluoropolyethers (PFPE) and lithium salts with fluorinated anions are a new class of electrolytes for lithium batteries. Unlike conventional electrolytes wherein electron-donating oxygen groups interact primarily with the lithium cations, the properties of PFPE-based electrolytes appear to be dependent on interactions between the fluorinated anions and the fluorinated backbones. We study these interactions by examining a family of lithium salts wherein the size of the fluorinated anion is systematically increased: lithium bis(fluorosulfonyl)imide (LiFSI), bis(trifluoromethanesulfonyl)imide (LiTFSI) salts and lithium bis(pentafluoroethanesulfonyl)imide (LiBETI). Two short chain perfluoroethers (PFE), one with three repeat units, C6-DMC, and another with four repeat units, C8-DMC were studied; both systems have dimethyl carbonate end groups.We find that LiFSI provides the highest conductivity in both C6-DMC and C8-DMC. These systems also present the lowest interfacial resistance against lithium metal electrodes. The steady-state transference number (t+ss) was above 0.6 for all of the electrolytes and was an increasing function of anion size. The product of conductivity and the steady-state transference number, a convenient measure of the efficacy of the electrolytes for lithium battery applications, exhibited a maximum at about 20 wt% salt in all electrolytes. Finally, amongst the systems studied, LiFSI/PFE mixtures were the most efficacious electrolytes.
- Authors:
-
[1];
- Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
- Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
- Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Environmental Technologies Division
- Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Environmental Technologies Division
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1476456
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 164; Journal Issue: 14; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Li ion transport; Perfluoropolyether; transference number
Citation Formats
Shah, Deep B., Olson, Kevin R., Karny, Adar, Mecham, Sue J., DeSimone, Joseph M., and Balsara, Nitash P. Effect of Anion Size on Conductivity and Transference Number of Perfluoroether Electrolytes with Lithium Salts. United States: N. p., 2017.
Web. doi:10.1149/2.0301714jes.
Shah, Deep B., Olson, Kevin R., Karny, Adar, Mecham, Sue J., DeSimone, Joseph M., & Balsara, Nitash P. Effect of Anion Size on Conductivity and Transference Number of Perfluoroether Electrolytes with Lithium Salts. United States. https://doi.org/10.1149/2.0301714jes
Shah, Deep B., Olson, Kevin R., Karny, Adar, Mecham, Sue J., DeSimone, Joseph M., and Balsara, Nitash P. Wed .
"Effect of Anion Size on Conductivity and Transference Number of Perfluoroether Electrolytes with Lithium Salts". United States. https://doi.org/10.1149/2.0301714jes. https://www.osti.gov/servlets/purl/1476456.
@article{osti_1476456,
title = {Effect of Anion Size on Conductivity and Transference Number of Perfluoroether Electrolytes with Lithium Salts},
author = {Shah, Deep B. and Olson, Kevin R. and Karny, Adar and Mecham, Sue J. and DeSimone, Joseph M. and Balsara, Nitash P.},
abstractNote = {Mixtures of perfluoropolyethers (PFPE) and lithium salts with fluorinated anions are a new class of electrolytes for lithium batteries. Unlike conventional electrolytes wherein electron-donating oxygen groups interact primarily with the lithium cations, the properties of PFPE-based electrolytes appear to be dependent on interactions between the fluorinated anions and the fluorinated backbones. We study these interactions by examining a family of lithium salts wherein the size of the fluorinated anion is systematically increased: lithium bis(fluorosulfonyl)imide (LiFSI), bis(trifluoromethanesulfonyl)imide (LiTFSI) salts and lithium bis(pentafluoroethanesulfonyl)imide (LiBETI). Two short chain perfluoroethers (PFE), one with three repeat units, C6-DMC, and another with four repeat units, C8-DMC were studied; both systems have dimethyl carbonate end groups.We find that LiFSI provides the highest conductivity in both C6-DMC and C8-DMC. These systems also present the lowest interfacial resistance against lithium metal electrodes. The steady-state transference number (t+ss) was above 0.6 for all of the electrolytes and was an increasing function of anion size. The product of conductivity and the steady-state transference number, a convenient measure of the efficacy of the electrolytes for lithium battery applications, exhibited a maximum at about 20 wt% salt in all electrolytes. Finally, amongst the systems studied, LiFSI/PFE mixtures were the most efficacious electrolytes.},
doi = {10.1149/2.0301714jes},
journal = {Journal of the Electrochemical Society},
number = 14,
volume = 164,
place = {United States},
year = {2017},
month = {11}
}
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