Regensburg 2016 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster: Functional Polymer Hybrids

CPP 15.1: Poster

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

Nanostructured hybrid block copolymer electrolytes as a membrane for lithium-ion microbatteries — •Maximilian Kaeppel, Ezzeldin Metwalli, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany

Solid-state polymer electrolyte membranes are promising alternatives to liquid electrolytes for energy storage related applications. A key challenge is to achieve a highly ionic conductive membrane that maintains both, high-modulus and chemical stability. The structure and conductivity of hybrid polymer electrolyte membranes composed of polystyrene-block-polyethylene oxide diblock copolymer (PS-b-PEO), lithium salt and ionic liquid (IL) were investigated. The PEO crystallization during the solution-casting of thin solid-state membranes was observed. The PEO crystallization is inhibited by increasing the doping level of both Li ions and IL. The high-modulus PS domains of the nanostructured hybrid membranes offers mechanical stability, while both the Li-containing PEO and IL enable the requisite high ionic conductivity. An optimized functional morphology of the hybrid membrane is achieved by enabling highly interpenetration hard PS and soft PEO/IL domains. The conductivity enhancement correlation with the evolved morphologies is proved.