NMR Multi-Scale Description of Ionic Conductivity Mechanisms Inside Polymer Electrolytes

Patrick Judeinstein,a,* Detlef Reichert,b Eduardo R. deAzevedo,c and Tito J. Bonagambac
a R.M.N. en Milieu Orienté, CNRS UMR 8074, Bâtiment 410, Université Paris-Sud, 91405 Orsay – France. E-mail: pjudeins@icmo.u-psud.fr
Department of Physics, University of Halle, Friedemann-Bach-Platz 6, 06108 Halle - Germany
c Instituto de Fisica de São Carlos, Universidade de São Paulo, Caixa Postal 369, CEP 13560-970 São Carlos-SP - Brazil

Solid Polymer Electrolytes are obtained by dissolving an alkali metal salt inside poly(oxyethylene) based materials. The properties of these materials are strongly related to the behavior of the different active species : solvent (polymer), cation, and anion. In this paper, we compare various NMR techniques capable of deciphering different aspects of these new materials : the structure and dynamics of the polymer, the cations and anions as well as the supramolecular interactions between these different species. These data are very useful for understanding the conductivity mechanisms inside various families of PEO-based materials (nanocomposites, block oligomers and copolymers, and liquid crystals) developed by our group.

Key words:
Solid Polymer Electrolytes, NMR, lithium battery, hibrid materials, nanocomposites, liquid crystals, polymer structure, polymer dimamic