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Cation coordination in ion-conducting gels based on PEO-grafted polymers

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Author

  • Josefina Adebahr
  • Patrik Gavelin
  • Patric Jannasch
  • Denis Ostrovskii
  • Bengt Wesslén
  • Per Jacobsson

Summary, in English

Ionic conducting polymer gels prepared from PEG-grafted acrylates, ethylene carbonate (EC), dimethyl carbonate (DMC), and LiPF6 are studied by means of infrared and Raman spectroscopy. It is found that the presence of grafted PEO chains substantially changes the coordination of lithium cations from 'cation-solvent' to 'cation-polymer'. Spectroscopic studies show that Li+-PEO coordination is strongly favored in competition with the solvent molecules and dominates completely at ether oxygen to Li-cation ratios (O:Li) of 10:1 and 5:1. At an O:M of 4:1 a solvent-cation interaction arises, in agreement with previously reported MD calculations of a preferred coordination number of 5 in similar systems. The results suggest that the complex interactions which determine long time stability and ionic transport properties can be designed by functionalization of the polymer backbone in PMMA-based gel electrolytes.

Publishing year

2000

Language

English

Pages

149-154

Publication/Series

Solid State Ionics

Volume

135

Issue

1-4

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 0167-2738