Effect of grain size on the ionic conductivity of a block copolymer electrolyte

Mahati Chintapalli, X. Chelsea Chen, Jacob L. Thelen, Alexander A. Teran, Xin Wang, Bruce Garetz, Nitash P. Balsara

Research output: Contribution to journalArticle

Abstract

A systematic study of the dependence of ionic conductivity on the grain size of a lamellar block copolymer electrolyte was performed. A freeze-dried mixture of poly(styrene)-block-poly(ethylene oxide) and lithium bis(trifluoromethylsulfonyl)imide salt was heated in steps from 29 to 116 °C and then cooled back to 29 °C with an annealing time ranging from 30 to 60 min at each temperature. Grain structure and ionic conductivity during these steps were quantified by in situ small-angle X-ray scattering and ac impedance spectroscopy, respectively. Conductivity depends both on grain structure and temperature. A normalization scheme to decouple the dependence of conductivity on temperature and grain structure is described. Ionic conductivity at a given temperature was found to decrease by a factor of 5.2 ± 0.9 as the SAXS measure of grain size increased from 13 to 88 nm. The fact that in the system studied, large, well-formed lamellar grains are less conducting than poorly defined, small grains suggests a new approach for optimizing the transport properties of block copolymer electrolytes. Further work is necessary to confirm the generality of this finding.

Original languageEnglish (US)
Pages (from-to)5424-5431
Number of pages8
JournalMacromolecules
Volume47
Issue number15
DOIs
StatePublished - Aug 12 2014

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Ionic conductivity
Electrolytes
Block copolymers
Crystal microstructure
Imides
Temperature
Styrene
Polyethylene oxides
X ray scattering
Lithium
Transport properties
Salts
Spectroscopy
Annealing

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

Cite this

Chintapalli, M., Chen, X. C., Thelen, J. L., Teran, A. A., Wang, X., Garetz, B., & Balsara, N. P. (2014). Effect of grain size on the ionic conductivity of a block copolymer electrolyte. Macromolecules, 47(15), 5424-5431. https://doi.org/10.1021/ma501202c

Effect of grain size on the ionic conductivity of a block copolymer electrolyte. / Chintapalli, Mahati; Chen, X. Chelsea; Thelen, Jacob L.; Teran, Alexander A.; Wang, Xin; Garetz, Bruce; Balsara, Nitash P.

In: Macromolecules, Vol. 47, No. 15, 12.08.2014, p. 5424-5431.

Research output: Contribution to journalArticle

Chintapalli, M, Chen, XC, Thelen, JL, Teran, AA, Wang, X, Garetz, B & Balsara, NP 2014, 'Effect of grain size on the ionic conductivity of a block copolymer electrolyte', Macromolecules, vol. 47, no. 15, pp. 5424-5431. https://doi.org/10.1021/ma501202c
Chintapalli M, Chen XC, Thelen JL, Teran AA, Wang X, Garetz B et al. Effect of grain size on the ionic conductivity of a block copolymer electrolyte. Macromolecules. 2014 Aug 12;47(15):5424-5431. https://doi.org/10.1021/ma501202c
Chintapalli, Mahati ; Chen, X. Chelsea ; Thelen, Jacob L. ; Teran, Alexander A. ; Wang, Xin ; Garetz, Bruce ; Balsara, Nitash P. / Effect of grain size on the ionic conductivity of a block copolymer electrolyte. In: Macromolecules. 2014 ; Vol. 47, No. 15. pp. 5424-5431.
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