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Title: Conductivity of carbonate- and perfluoropolyether-based electrolytes in porous separators

Abstract

In lithium batteries, a porous separator filled with an electrolyte is placed in between the electrodes. Properties of the separator such as porosity and wettability strongly influence the conductivity of the electrolyte-separator composite. This work focuses on three commercial separators: a single layer polypropylene (Celgard 2500), a trilayer polypropylene-polyethylene-polypropylene (PP-PE-PP), and a porous polytetrafluoroethylene (PTFE). Electron microscopy was used to characterize the pore structure, and these experiments reveal large differences in pore morphology. The separators were soaked in both carbonate- and perfluoropolyether-based electrolytes. The conductivity of the neat electrolytes (σ0) varied from 6.46 × 10-6 to 1.76 × 10-2 S cm-1. The porosity and wettability of the separator affect the electrolyte uptake that in turn affect the conductivity of electrolyte-separator composites. The conductivity of the electrolyte-separator composites (σ) was found to follow a master equation, σ = 0.51·σ0·Φc3.2±0.2, where Φc is the volume fraction of the electrolyte in each separator.

Authors:
 [1];  [1];  [1];  [2];  [1];  [3];  [1]
+ Show Author Affiliations
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. 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:
1474956
Alternate Identifier(s):
OSTI ID: 1326406
Grant/Contract Number:  
AC02-05CH11231; SC0012673
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 323; Journal Issue: C; Related Information: © 2016 Elsevier B.V. All rights reserved.; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; perfluoropolyether; conductivity; separators; battery; polyolefin; polytetrafluoroethylene

Citation Formats

Devaux, Didier, Chang, Yu H., Villaluenga, Irune, Chen, X. Chelsea, Chintapalli, Mahati, DeSimone, Joseph M., and Balsara, Nitash P. Conductivity of carbonate- and perfluoropolyether-based electrolytes in porous separators. United States: N. p., 2016. Web. doi:10.1016/j.jpowsour.2016.05.039.
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Devaux, Didier, Chang, Yu H., Villaluenga, Irune, Chen, X. Chelsea, Chintapalli, Mahati, DeSimone, Joseph M., & Balsara, Nitash P. Conductivity of carbonate- and perfluoropolyether-based electrolytes in porous separators. United States. https://doi.org/10.1016/j.jpowsour.2016.05.039
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Devaux, Didier, Chang, Yu H., Villaluenga, Irune, Chen, X. Chelsea, Chintapalli, Mahati, DeSimone, Joseph M., and Balsara, Nitash P. Fri . "Conductivity of carbonate- and perfluoropolyether-based electrolytes in porous separators". United States. https://doi.org/10.1016/j.jpowsour.2016.05.039. https://www.osti.gov/servlets/purl/1474956.
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@article{osti_1474956,
title = {Conductivity of carbonate- and perfluoropolyether-based electrolytes in porous separators},
author = {Devaux, Didier and Chang, Yu H. and Villaluenga, Irune and Chen, X. Chelsea and Chintapalli, Mahati and DeSimone, Joseph M. and Balsara, Nitash P.},
abstractNote = {In lithium batteries, a porous separator filled with an electrolyte is placed in between the electrodes. Properties of the separator such as porosity and wettability strongly influence the conductivity of the electrolyte-separator composite. This work focuses on three commercial separators: a single layer polypropylene (Celgard 2500), a trilayer polypropylene-polyethylene-polypropylene (PP-PE-PP), and a porous polytetrafluoroethylene (PTFE). Electron microscopy was used to characterize the pore structure, and these experiments reveal large differences in pore morphology. The separators were soaked in both carbonate- and perfluoropolyether-based electrolytes. The conductivity of the neat electrolytes (σ0) varied from 6.46 × 10-6 to 1.76 × 10-2 S cm-1. The porosity and wettability of the separator affect the electrolyte uptake that in turn affect the conductivity of electrolyte-separator composites. The conductivity of the electrolyte-separator composites (σ) was found to follow a master equation, σ = 0.51·σ0·Φc3.2±0.2, where Φc is the volume fraction of the electrolyte in each separator.},
doi = {10.1016/j.jpowsour.2016.05.039},
journal = {Journal of Power Sources},
number = C,
volume = 323,
place = {United States},
year = {Fri May 20 00:00:00 EDT 2016},
month = {Fri May 20 00:00:00 EDT 2016}
}
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Journal Article:
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https://doi.org/10.1016/j.jpowsour.2016.05.039
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