Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Poster: Polymer Dynamics
CPP 18.17: Poster
Dienstag, 12. März 2013, 18:15–20:15, Poster C
Molecular Dynamics and Conductivity of Solid Polymer Electrolytes based on Poly(butylene)oxide and LiClO4 — •Bernhard Hopfenmüller1, Gerald Schneider1, Jürgen Allgaier2, Reiner Zorn2, and Dieter Richter2 — 1Jülich Center for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at FRM II, Lichtenbergstr.1, 85747 Garching — 2Institute of Complex Systems (ICS-1) and Jülich Center for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 52425 Jülich
Solid polymer electrolytes play a crucial role in our daily life, e.g. as polymer-based batteries. Such systems are build up of mixtures containg a polymer and a salt. The charge carrier mobility and therefore the conductivity is inherently coupled with the molecular dynamics of the polymer itself. Addition of salt changes the stiffness of a polymer and hence again the conductivity is affected.The most simple and therefore much studied systems are based on poly(ethylene)oxide. This polymer cristallizes at ambient temperature. Though solid polmyer electrolytes based on it have a reduced conductivity in solid state. Therefore we wanted to study systems based on poly(butylene)oxide (PBO) and lithium perchlorate (LiClO4). PBO has an additional sidegroup that prevents cristallization at all temperatures. Dielectric spectroscopy allows to study both, conductivity and molecular dynamics with the same technique. In our presentation we want to show results of dielectric spectroscopy on solid PBO electrolytes with different salt contents. We want to demonstrate that the the conductivity and the molecular dynamics are mainly coupled by the segmental dynamics.