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Title: Mechanically Robust, Sodium-Ion Conducting Membranes for Nonaqueous Redox Flow Batteries

Abstract

Sodium-based batteries are promising for grid-storage applications because of significantly lower cost compared to lithium-based systems. The advancement of solid-state and redox-flow sodium-ion batteries requires sodium-ion exchange membranes with high conductivity, electrochemical stability, and mechanical robustness. This study demonstrates that membranes based on poly(ethylene oxide) (PEO) can meet these requirements. Membranes plasticized with tetraethylene glycol dimethyl ether (TEGDME) achieve high ionic conductivity. Plasticized PEO membranes containing sodium triflate salt (NaTFS) show about 2 orders of magnitude higher conductivity compared to nonplasticized PEO membranes. Results from vibrational spectroscopy and differential scanning calorimetry describe the coordination chemistry in these multiphase materials and explain the mechanisms behind the increased conductivity. The mechanical properties of the membranes improve by addition of 5 wt % sodium carboxymethyl cellulose (CMC) without compromising the conductivity or electrochemical stability against sodium metal. In conclusion, the optimized membrane is an excellent candidate for low-cost energy storage systems that operate over a wide voltage window near ambient temperature.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1];  [3];  [2]; ORCiD logo [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Nanomechanics, Inc., Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Electricity Delivery and Energy Reliability (OE)
OSTI Identifier:
1459302
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 3; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; sodium-ion battery; membrane; poly(ethylene oxide); Raman; FTIR; conductivity; DSC; nanoindentation

Citation Formats

Ruther, Rose E., Yang, Guang, Delnick, Frank M., Tang, Zhijiang, Lehmann, Michelle L., Saito, Tomonori, Meng, Yujie, Zawodzinski, Jr., Thomas A., and Nanda, Jagjit. Mechanically Robust, Sodium-Ion Conducting Membranes for Nonaqueous Redox Flow Batteries. United States: N. p., 2018. Web. doi:10.1021/acsenergylett.8b00680.
Ruther, Rose E., Yang, Guang, Delnick, Frank M., Tang, Zhijiang, Lehmann, Michelle L., Saito, Tomonori, Meng, Yujie, Zawodzinski, Jr., Thomas A., & Nanda, Jagjit. Mechanically Robust, Sodium-Ion Conducting Membranes for Nonaqueous Redox Flow Batteries. United States. doi:10.1021/acsenergylett.8b00680.
Ruther, Rose E., Yang, Guang, Delnick, Frank M., Tang, Zhijiang, Lehmann, Michelle L., Saito, Tomonori, Meng, Yujie, Zawodzinski, Jr., Thomas A., and Nanda, Jagjit. Mon . "Mechanically Robust, Sodium-Ion Conducting Membranes for Nonaqueous Redox Flow Batteries". United States. doi:10.1021/acsenergylett.8b00680.
@article{osti_1459302,
title = {Mechanically Robust, Sodium-Ion Conducting Membranes for Nonaqueous Redox Flow Batteries},
author = {Ruther, Rose E. and Yang, Guang and Delnick, Frank M. and Tang, Zhijiang and Lehmann, Michelle L. and Saito, Tomonori and Meng, Yujie and Zawodzinski, Jr., Thomas A. and Nanda, Jagjit},
abstractNote = {Sodium-based batteries are promising for grid-storage applications because of significantly lower cost compared to lithium-based systems. The advancement of solid-state and redox-flow sodium-ion batteries requires sodium-ion exchange membranes with high conductivity, electrochemical stability, and mechanical robustness. This study demonstrates that membranes based on poly(ethylene oxide) (PEO) can meet these requirements. Membranes plasticized with tetraethylene glycol dimethyl ether (TEGDME) achieve high ionic conductivity. Plasticized PEO membranes containing sodium triflate salt (NaTFS) show about 2 orders of magnitude higher conductivity compared to nonplasticized PEO membranes. Results from vibrational spectroscopy and differential scanning calorimetry describe the coordination chemistry in these multiphase materials and explain the mechanisms behind the increased conductivity. The mechanical properties of the membranes improve by addition of 5 wt % sodium carboxymethyl cellulose (CMC) without compromising the conductivity or electrochemical stability against sodium metal. In conclusion, the optimized membrane is an excellent candidate for low-cost energy storage systems that operate over a wide voltage window near ambient temperature.},
doi = {10.1021/acsenergylett.8b00680},
journal = {ACS Energy Letters},
number = ,
volume = 3,
place = {United States},
year = {Mon Jun 18 00:00:00 EDT 2018},
month = {Mon Jun 18 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
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