Raman study on intermolecular and ionic interactions in gel electrolytes

Raman spectroscopy was applied to investigate the intermolecular interactio ns in multi-component gel electrolytes consisting of ethylene carbonate and propylene carbonate, (EC-PC) mixed solvent, lithium salt and PMMA polymeri c matrix. It is shown that triflate anions tend to essential aggregation in the EC/PC solvent, which results in a worsening of both mechanical and con ductive properties of the gel. It is also found that PMMA-based gels with l ow salt concentration show an obvious macroscopic phase separation, and the spectroscopic characterization of the different phases is presented. (C) 1 999 Elsevier Science B.V. All rights reserved.