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Title: A Nuclear Magnetic Resonance Study of Cation and Anion Dynamics in Polymer–Ceramic Composite Solid Electrolytes

Abstract

Polymer–ceramic composite electrolytes are promising for the application of all-solid-state lithium-ion batteries with high energy density and improved safety. In this work, we employ temperature-dependent 7Li and 19F NMR to examine the chemical environment and the dynamics of Li+ cation and triflate anion in poly(ethylene oxide) (PEO)–lithium triflate (LiTf) polymer electrolyte and a composite electrolyte containing 55 vol % doped lithium aluminum titanium phosphate (LICGC). The line shape analysis and spin–lattice relaxation (T1) measurements suggest both the Li+ cations and the Tf anions reside in two distinct environment: a mobile environment and an immobile environment. In the semicrystalline state, a large ratio (>70%) of immobile Li+ and Tf is observed. In the melt state, the ratio of mobile cations and anions significantly increases. With the presence of LICGC ceramic, an increased ratio of immobile Li+ and Tf and reduced mobility of the mobile components are observed, indicating that the ceramic negatively impacts the transport of both the cations and the anions. NMR characterizations are corroborated by conductivity results, which reveal that the intrinsic ionic conductivity of the polymer phase of the composite electrolyte was only 0.15 of the ceramic-free polymer electrolyte at room temperature. These results shed light on themore » challenges inherent to composite electrolytes with the goal of achieving both enhanced Li+ transference number and ionic conductivity.« less

Authors:
 [1];  [1];  [2];  [2];  [3]; ORCiD logo [4]
  1. Beihang Univ., Beijing (China)
  2. Hunter College of the City Univ. of New York, NY (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1761677
Grant/Contract Number:  
AC05-00OR22725; N00014-18-1-2720; N00014-16-1-2579
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Polymer Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 3; Journal ID: ISSN 2637-6105
Publisher:
ACS Publications
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; solid state NMR; polymer electrolyte; composite electrolyte; ionic conductivity; lithium battery

Citation Formats

Peng, Jing, Xiao, Ye, Clarkson, David A., Greenbaum, Steven G., Zawodzinski, Thomas A., and Chen, X. Chelsea. A Nuclear Magnetic Resonance Study of Cation and Anion Dynamics in Polymer–Ceramic Composite Solid Electrolytes. United States: N. p., 2020. Web. doi:10.1021/acsapm.9b01068.
Peng, Jing, Xiao, Ye, Clarkson, David A., Greenbaum, Steven G., Zawodzinski, Thomas A., & Chen, X. Chelsea. A Nuclear Magnetic Resonance Study of Cation and Anion Dynamics in Polymer–Ceramic Composite Solid Electrolytes. United States. https://doi.org/10.1021/acsapm.9b01068
Peng, Jing, Xiao, Ye, Clarkson, David A., Greenbaum, Steven G., Zawodzinski, Thomas A., and Chen, X. Chelsea. Mon . "A Nuclear Magnetic Resonance Study of Cation and Anion Dynamics in Polymer–Ceramic Composite Solid Electrolytes". United States. https://doi.org/10.1021/acsapm.9b01068. https://www.osti.gov/servlets/purl/1761677.
@article{osti_1761677,
title = {A Nuclear Magnetic Resonance Study of Cation and Anion Dynamics in Polymer–Ceramic Composite Solid Electrolytes},
author = {Peng, Jing and Xiao, Ye and Clarkson, David A. and Greenbaum, Steven G. and Zawodzinski, Thomas A. and Chen, X. Chelsea},
abstractNote = {Polymer–ceramic composite electrolytes are promising for the application of all-solid-state lithium-ion batteries with high energy density and improved safety. In this work, we employ temperature-dependent 7Li and 19F NMR to examine the chemical environment and the dynamics of Li+ cation and triflate anion in poly(ethylene oxide) (PEO)–lithium triflate (LiTf) polymer electrolyte and a composite electrolyte containing 55 vol % doped lithium aluminum titanium phosphate (LICGC). The line shape analysis and spin–lattice relaxation (T1) measurements suggest both the Li+ cations and the Tf– anions reside in two distinct environment: a mobile environment and an immobile environment. In the semicrystalline state, a large ratio (>70%) of immobile Li+ and Tf– is observed. In the melt state, the ratio of mobile cations and anions significantly increases. With the presence of LICGC ceramic, an increased ratio of immobile Li+ and Tf– and reduced mobility of the mobile components are observed, indicating that the ceramic negatively impacts the transport of both the cations and the anions. NMR characterizations are corroborated by conductivity results, which reveal that the intrinsic ionic conductivity of the polymer phase of the composite electrolyte was only 0.15 of the ceramic-free polymer electrolyte at room temperature. These results shed light on the challenges inherent to composite electrolytes with the goal of achieving both enhanced Li+ transference number and ionic conductivity.},
doi = {10.1021/acsapm.9b01068},
journal = {ACS Applied Polymer Materials},
number = 3,
volume = 2,
place = {United States},
year = {Mon Mar 02 00:00:00 EST 2020},
month = {Mon Mar 02 00:00:00 EST 2020}
}

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