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Title: Liquid perfluoropolyether electrolytes with enhanced ionic conductivity for lithium battery applications

Abstract

Here, we prepared nonflammable liquid polymer electrolytes for lithium-ion batteries by mixing ethoxylated perfluoropolyethers (PFPEs) with LiN(SO2CF3)2 salt. Interestingly, we identified the presence of chain coupling in the PFPE polymers and their functionalized derivatives, resulting in a mixture of PFPEs with varying molecular weights. The distribution of molecular weights, along with PFPE's multiple functionalities, allows systematic manipulation of structure to enhance electrochemical and physical properties. Furthermore, the electrolytes exhibited a wide thermal stability window (5% degradation temperature >180°C). Despite substantial increases in viscosity upon loading the PFPEs with lithium salt, the conductivity (σ ≈ 5 × 10-5 S cm-1 at 28°C) of the novel electrolytes was about an order of magnitude higher than that of our previously reported PFPE electrolytes. Ethoxylated derivatives of PFPE electrolytes exhibit elevated conductivity compared to non-ethoxylated derivatives, demonstrating our capability to enhance the conductive properties of the PFPE platform by attaching various functional groups to the polymer backbone.

Authors:
 [1];  [1];  [2];  [2];  [1];  [1];  [1];  [1];  [3];  [4]
+ Show Author Affiliations
  1. University of North Carolina, Chapel Hill, NC (United States)
  2. University of California, Berkeley, CA (United States)
  3. University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  4. University of North Carolina, Chapel Hill, NC (United States); North Carolina State University, Raleigh, NC (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Stony Brook Univ., NY (United States). Center for Mesoscale Transport Properties (m2M)
OSTI Identifier:
1474966
Alternate Identifier(s):
OSTI ID: 1359789
Grant/Contract Number:  
AC02-05CH11231; SC0012673
Resource Type:
Accepted Manuscript
Journal Name:
Polymer
Additional Journal Information:
Journal Volume: 100; Journal Issue: C; Related Information: © 2016; Journal ID: ISSN 0032-3861
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; perfluoropolyether; electrolyte; battery

Citation Formats

Olson, Kevin R., Wong, Dominica H. C., Chintapalli, Mahati, Timachova, Ksenia, Janusziewicz, Rima, Daniel, William F. M., Mecham, Sue, Sheiko, Sergei, Balsara, Nitash P., and DeSimone, Joseph M. Liquid perfluoropolyether electrolytes with enhanced ionic conductivity for lithium battery applications. United States: N. p., 2016. Web. doi:10.1016/j.polymer.2016.08.020.
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Olson, Kevin R., Wong, Dominica H. C., Chintapalli, Mahati, Timachova, Ksenia, Janusziewicz, Rima, Daniel, William F. M., Mecham, Sue, Sheiko, Sergei, Balsara, Nitash P., & DeSimone, Joseph M. Liquid perfluoropolyether electrolytes with enhanced ionic conductivity for lithium battery applications. United States. https://doi.org/10.1016/j.polymer.2016.08.020
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Olson, Kevin R., Wong, Dominica H. C., Chintapalli, Mahati, Timachova, Ksenia, Janusziewicz, Rima, Daniel, William F. M., Mecham, Sue, Sheiko, Sergei, Balsara, Nitash P., and DeSimone, Joseph M. Mon . "Liquid perfluoropolyether electrolytes with enhanced ionic conductivity for lithium battery applications". United States. https://doi.org/10.1016/j.polymer.2016.08.020. https://www.osti.gov/servlets/purl/1474966.
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@article{osti_1474966,
title = {Liquid perfluoropolyether electrolytes with enhanced ionic conductivity for lithium battery applications},
author = {Olson, Kevin R. and Wong, Dominica H. C. and Chintapalli, Mahati and Timachova, Ksenia and Janusziewicz, Rima and Daniel, William F. M. and Mecham, Sue and Sheiko, Sergei and Balsara, Nitash P. and DeSimone, Joseph M.},
abstractNote = {Here, we prepared nonflammable liquid polymer electrolytes for lithium-ion batteries by mixing ethoxylated perfluoropolyethers (PFPEs) with LiN(SO2CF3)2 salt. Interestingly, we identified the presence of chain coupling in the PFPE polymers and their functionalized derivatives, resulting in a mixture of PFPEs with varying molecular weights. The distribution of molecular weights, along with PFPE's multiple functionalities, allows systematic manipulation of structure to enhance electrochemical and physical properties. Furthermore, the electrolytes exhibited a wide thermal stability window (5% degradation temperature >180°C). Despite substantial increases in viscosity upon loading the PFPEs with lithium salt, the conductivity (σ ≈ 5 × 10-5 S cm-1 at 28°C) of the novel electrolytes was about an order of magnitude higher than that of our previously reported PFPE electrolytes. Ethoxylated derivatives of PFPE electrolytes exhibit elevated conductivity compared to non-ethoxylated derivatives, demonstrating our capability to enhance the conductive properties of the PFPE platform by attaching various functional groups to the polymer backbone.},
doi = {10.1016/j.polymer.2016.08.020},
journal = {Polymer},
number = C,
volume = 100,
place = {United States},
year = {Mon Aug 08 00:00:00 EDT 2016},
month = {Mon Aug 08 00:00:00 EDT 2016}
}
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https://doi.org/10.1016/j.polymer.2016.08.020
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