Effect of ion distribution on conductivity of block copolymer electrolytes

Enrique D. Gomez, Ashoutosh Panday, Edward H. Feng, Vincent Chen, Gregory M. Stone, Andrew M. Minor, Christian Kisielowski, Kenneth H. Downing, Oleg Borodin, Grant D. Smith, Nitash P. Balsara

Research output: Contribution to journalArticlepeer-review

185 Scopus citations

Abstract

Energy-filtered transmission electron microscopy (EFTEM) was used to determine the distribution of lithium ions in solid polymer electrolytes for lithium batteries. The electrolytes of interest are mixtures of bis(trifluoromethane)sulfonimide lithium salt and symmetric poly(styrene-b/ock- ethylene oxide) copolymers (SEO). In contrast to current solid and liquid electrolytes, the conductivity of SEO/salt mixtures increases with increasing molecular weight of the copolymers. EFTEM results show that the salt is increasingly localized In the middle of the polyethylene oxide) (PEO) lamellae as the molecular weight of the copolymers is increased. Calculations of the inhomogeneous local stress field in block copolymer microdomalns, modeled using self-consistent field theory, provide a quantitative explanation for this observation. These stresses, which increase with increasing molecular weight, interfere with the ability of PEO chains to coordinate with lithium cations near the walls of the PEO channels where ion mobility Is expected to be low.

Original languageEnglish (US)
Pages (from-to)1212-1216
Number of pages5
JournalNano letters
Volume9
Issue number3
DOIs
StatePublished - Mar 11 2009

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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