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Title: Temperature and concentration dependence of the ionic transport properties of poly(ethylene oxide) electrolytes

Abstract

Even though batteries operate at different temperatures depending on their use and state of charge, little work has been done to understand the effects of temperature on the ionic transport properties of the electrolyte. The temperature dependence of these properties is important for predicting how the performance of the battery will change as a function of temperature, along with gaining fundamental insights into the underpinnings of ion transport in these electrolytes. In this study we provide the first investigation of the effect of temperature on ionic conductivity, salt diffusion coefficient, transference number, and the thermodynamic factor of a model polymer electrolyte: lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt dissolved in poly(ethylene oxide) (PEO). These properties were measured at 70, 90, and 110 °C. As expected, we see monotonic increases in conductivity and diffusion with increasing temperature. Additionally, monotonic dependencies on temperature were obtained for the transference number and the thermodynamic factor. One presumes that concentration polarization decreases with increasing temperature due to more rapid ion transport. We use concentrated solution theory to predict concentration polarization in lithium-PEO/LiTFSI-lithium symmetric cells and thereby quantify the effect of temperature on concentration polarization.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1819783
Alternate Identifier(s):
OSTI ID: 1900418
Grant/Contract Number:  
AC02-06CH11357; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Solid State Ionics
Additional Journal Information:
Journal Name: Solid State Ionics Journal Volume: 370 Journal Issue: C; Journal ID: ISSN 0167-2738
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
25 ENERGY STORAGE; polymer electrolyte; temperature dependence; lithium ion batteries; concentration polarization; concentrated solution theory; ionic transport properties; poly(ethylene oxide)

Citation Formats

Hoffman, Zach J., Shah, Deep B., and Balsara, Nitash P. Temperature and concentration dependence of the ionic transport properties of poly(ethylene oxide) electrolytes. Netherlands: N. p., 2021. Web. doi:10.1016/j.ssi.2021.115751.
Hoffman, Zach J., Shah, Deep B., & Balsara, Nitash P. Temperature and concentration dependence of the ionic transport properties of poly(ethylene oxide) electrolytes. Netherlands. https://doi.org/10.1016/j.ssi.2021.115751
Hoffman, Zach J., Shah, Deep B., and Balsara, Nitash P. Mon . "Temperature and concentration dependence of the ionic transport properties of poly(ethylene oxide) electrolytes". Netherlands. https://doi.org/10.1016/j.ssi.2021.115751.
@article{osti_1819783,
title = {Temperature and concentration dependence of the ionic transport properties of poly(ethylene oxide) electrolytes},
author = {Hoffman, Zach J. and Shah, Deep B. and Balsara, Nitash P.},
abstractNote = {Even though batteries operate at different temperatures depending on their use and state of charge, little work has been done to understand the effects of temperature on the ionic transport properties of the electrolyte. The temperature dependence of these properties is important for predicting how the performance of the battery will change as a function of temperature, along with gaining fundamental insights into the underpinnings of ion transport in these electrolytes. In this study we provide the first investigation of the effect of temperature on ionic conductivity, salt diffusion coefficient, transference number, and the thermodynamic factor of a model polymer electrolyte: lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt dissolved in poly(ethylene oxide) (PEO). These properties were measured at 70, 90, and 110 °C. As expected, we see monotonic increases in conductivity and diffusion with increasing temperature. Additionally, monotonic dependencies on temperature were obtained for the transference number and the thermodynamic factor. One presumes that concentration polarization decreases with increasing temperature due to more rapid ion transport. We use concentrated solution theory to predict concentration polarization in lithium-PEO/LiTFSI-lithium symmetric cells and thereby quantify the effect of temperature on concentration polarization.},
doi = {10.1016/j.ssi.2021.115751},
journal = {Solid State Ionics},
number = C,
volume = 370,
place = {Netherlands},
year = {2021},
month = {11}
}

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