Regensburg 2016 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster: Functional Polymer Hybrids

CPP 15.2: Poster

Monday, March 7, 2016, 18:15–21:00, Poster B2

Morphology of block copolymer electrolytes for rechargeable lithium batteries — •Bernhard Springer, Ezzeldin Metwalli, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany

Block copolymers (BC) electrolytes have been recently investigated as solid-state membranes for lithium-ion batteries. Nanostructured BC electrolyte contains both, the ionic conducting as well as the high-tensile polymer domains, enabling both, high ionic conductivity and improved mechanical stability. Since the diffusion path of the lithium-ions only follows the percolation path of the ionic conducting domain, the morphology of the BC electrolyte is an essential parameter. Theoretical studies have recently reported that the BC electrolyte phase diagrams significantly deviate from the conventional BC phase diagrams due to electrostatic interactions between polar chains and alkali metal-ions. The morphology of polylauryl methacrylate-block-polymethacrylic acid (PLMA-b-PMAA) BC electrolyte with three different ionic block volume fractions was investigated using SEM and SAXS. In the current study, morphological deviation compared with that of the conventional BC phase diagrams in consistent with the theoretical studies is experimentally proved. Conductivity measurements of the Li-ions containing BC hybrid films were examined for different morphologies using impedance spectroscopy.