Synthesis and characterization of single-ion graft copolymer electrolytes


Trapa P., Acar M. H. , SADOWAY D., MAYES A.

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol.152, no.12, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 152 Issue: 12
  • Publication Date: 2005
  • Doi Number: 10.1149/1.2073089
  • Title of Journal : JOURNAL OF THE ELECTROCHEMICAL SOCIETY

Abstract

A microphase-separating single-ion conductor, poly[(oxyethylene)(9) methacrylate-ran-lithium methacrylate]-graft-poly(dimethyl siloxane), P(OEM-r-LiMA)-g-PDMS, was prepared by lithiating a precursor polymer synthesized by free radical methods using commercially available macromonomers. This material possessed a low conductivity, stemming from high ion-pairing interactions that severely restricted the number of charge carriers available for conduction. Subsequent conversion of the LiMA units via the addition of BF3, a Lewis acid, resulted in a 2 orders-of-magnitude rise in conductivity, a gain that could be attributed to a large increase in the number of mobile cations. By blending this material with uncharged POEM-g-PDMS, the room-temperature conductivity was optimized to 7x10(-6) S/cm. With a lithium transference number of unity, these materials exhibit higher dc-measured conductivities at elevated currents than their salt-doped counterparts and are electrochemically stable to similar to 4.5 V. (c) 2005 The Electrochemical Society.