Effect of molecular weight and salt concentration on conductivity of block copolymer electrolytes

Ashoutosh Panday, Scott Mullin, Enrique D. Gomez, Nisita Wanakule, Vincent L. Chen, Alexander Hexemer, John Pople, Nitash P. Balsara

Research output: Contribution to journalArticle

200 Citations (Scopus)

Abstract

The ionic conductivity, σ, of mixtures of nearly symmetric polystyrene-block-poly(ethylene oxide) copolymers and Li[N(SO 2CF 3) 2] (LiTFSI) salt was measured as a function of molecular weight, salt concentration, and temperature. The molecular weight of the polyethylene oxide) block, M PEO, was varied from 7 to 98 kg/mol. The molar ratio of lithium to ethylene oxide, r, was varied from 0.02 to 0.10. In general, σ increases with increasing M PEO for all values of r. The data can be summarized by plots of normalized conductivity, σ n, versus M PEO, where σ n = σ/fφ PEOσ PEO), φ PEO is the PEO volume fraction in the copolymer, σ PEO is the conductivity of PEO homopolymer, and f is a morphology-dependent factor set equal to 2/3 for our lamellar samples. The temperature-dependent conductivity data at a given salt concentration collapse onto a single curve when plotted in this format. At r = 0.085, σn values reach a plateau in the vicinity of unity in the high M PEO limit. At other values of r, σn continues to increase with M PEO within the experimental range and reaches a value of around 0.5 in the high M PEO limit.

Original languageEnglish (US)
Pages (from-to)4632-4637
Number of pages6
JournalMacromolecules
Volume42
Issue number13
DOIs
StatePublished - Jul 14 2009

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Polyethylene oxides
Electrolytes
Block copolymers
Salts
Molecular weight
Copolymers
Ethylene Oxide
Polystyrenes
Ionic conductivity
Homopolymerization
Lithium
Volume fraction
Ethylene

All Science Journal Classification (ASJC) codes

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

Cite this

Panday, A., Mullin, S., Gomez, E. D., Wanakule, N., Chen, V. L., Hexemer, A., ... Balsara, N. P. (2009). Effect of molecular weight and salt concentration on conductivity of block copolymer electrolytes. Macromolecules, 42(13), 4632-4637. https://doi.org/10.1021/ma900451e
Panday, Ashoutosh ; Mullin, Scott ; Gomez, Enrique D. ; Wanakule, Nisita ; Chen, Vincent L. ; Hexemer, Alexander ; Pople, John ; Balsara, Nitash P. / Effect of molecular weight and salt concentration on conductivity of block copolymer electrolytes. In: Macromolecules. 2009 ; Vol. 42, No. 13. pp. 4632-4637.
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Panday, A, Mullin, S, Gomez, ED, Wanakule, N, Chen, VL, Hexemer, A, Pople, J & Balsara, NP 2009, 'Effect of molecular weight and salt concentration on conductivity of block copolymer electrolytes', Macromolecules, vol. 42, no. 13, pp. 4632-4637. https://doi.org/10.1021/ma900451e

Effect of molecular weight and salt concentration on conductivity of block copolymer electrolytes. / Panday, Ashoutosh; Mullin, Scott; Gomez, Enrique D.; Wanakule, Nisita; Chen, Vincent L.; Hexemer, Alexander; Pople, John; Balsara, Nitash P.

In: Macromolecules, Vol. 42, No. 13, 14.07.2009, p. 4632-4637.

Research output: Contribution to journalArticle

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T1 - Effect of molecular weight and salt concentration on conductivity of block copolymer electrolytes

AU - Panday, Ashoutosh

AU - Mullin, Scott

AU - Gomez, Enrique D.

AU - Wanakule, Nisita

AU - Chen, Vincent L.

AU - Hexemer, Alexander

AU - Pople, John

AU - Balsara, Nitash P.

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Y1 - 2009/7/14

N2 - The ionic conductivity, σ, of mixtures of nearly symmetric polystyrene-block-poly(ethylene oxide) copolymers and Li[N(SO 2CF 3) 2] (LiTFSI) salt was measured as a function of molecular weight, salt concentration, and temperature. The molecular weight of the polyethylene oxide) block, M PEO, was varied from 7 to 98 kg/mol. The molar ratio of lithium to ethylene oxide, r, was varied from 0.02 to 0.10. In general, σ increases with increasing M PEO for all values of r. The data can be summarized by plots of normalized conductivity, σ n, versus M PEO, where σ n = σ/fφ PEOσ PEO), φ PEO is the PEO volume fraction in the copolymer, σ PEO is the conductivity of PEO homopolymer, and f is a morphology-dependent factor set equal to 2/3 for our lamellar samples. The temperature-dependent conductivity data at a given salt concentration collapse onto a single curve when plotted in this format. At r = 0.085, σn values reach a plateau in the vicinity of unity in the high M PEO limit. At other values of r, σn continues to increase with M PEO within the experimental range and reaches a value of around 0.5 in the high M PEO limit.

AB - The ionic conductivity, σ, of mixtures of nearly symmetric polystyrene-block-poly(ethylene oxide) copolymers and Li[N(SO 2CF 3) 2] (LiTFSI) salt was measured as a function of molecular weight, salt concentration, and temperature. The molecular weight of the polyethylene oxide) block, M PEO, was varied from 7 to 98 kg/mol. The molar ratio of lithium to ethylene oxide, r, was varied from 0.02 to 0.10. In general, σ increases with increasing M PEO for all values of r. The data can be summarized by plots of normalized conductivity, σ n, versus M PEO, where σ n = σ/fφ PEOσ PEO), φ PEO is the PEO volume fraction in the copolymer, σ PEO is the conductivity of PEO homopolymer, and f is a morphology-dependent factor set equal to 2/3 for our lamellar samples. The temperature-dependent conductivity data at a given salt concentration collapse onto a single curve when plotted in this format. At r = 0.085, σn values reach a plateau in the vicinity of unity in the high M PEO limit. At other values of r, σn continues to increase with M PEO within the experimental range and reaches a value of around 0.5 in the high M PEO limit.

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