Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.24: Poster
Wednesday, March 16, 2011, 17:00–19:00, P2
Lithium-containing diblock copolymer thin films for solid-state micro-batteries — •William Hefter1, Ezzeldin Metwalli1, Man Nie1, Volker Körstgens1, Jan Perlich2, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany — 2HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
The ion-conducting polymer electrolyte in thin film format is important in the fabrication of lightweight and shape-flexible solid-state micro-batteries. Thin hybrid films based on polystyrene-block-polyethylene oxide and the alkali salt of lithium (bis) trifluoromethanesulfonimide are investigated using optical microscopy, atomic force microscopy and grazing incidence small angle x-ray scattering. The structure of the hybrid films are examined as a function of Li/PEO ratio. Below a critical concentration cLi/PEO the crystallization of PEO is prohibited and nanostructured block copolymer films with Li incorporated in the PEO domain are obtained. In a concentration regime above cLi/PEO aggregation of Li salt to the polymer film surface occurs due to limited capability of the PEO to accommodate the Li ions in the thin film geometry. A solvent vapor annealing of such films further enriches Li salt at the surface due to the interaction with the interfaces.