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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.10: Poster

Montag, 16. März 2020, 17:30–19:30, P3

Lithium Ion Transport in Block–Copolymer Electrolytes – A Molecular Dynamics Study — •Len Kimms, Diddo Diddens, and Andreas Heuer — Institut für physikalische Chemie, Westfälische Wilhelms–Universität Münster, Corrensstraße 28/30, 48149 Münster, {len.kimms, d.diddens, andheuer}@uni-muenster.de

On this poster we will present insights into the ion transport in block–copolymer electrolytes with lamellar microstructure. Traditional solid polymer electrolytes (SPE) consist of salt accommodated in an amorphous poly(ethylene oxide) (PEO) melt. Subsequently other polymers have been tried in order to improve conductivity and safety. From a safety point of view rigid polymers are favored since they can suppress dendrite growth and provide mechanical stability. Unfortunately, those types of polymers exhibit decreased segmental dynamics which hinders the ion mobility. Block–copolymers provide the ability to tune the mechanical and ion–transport properties of the blocks independent from each other. Here we report results about the ion transport in block–copolymer electrolytes with lamellar microstructure which experimentally have displayed very high conductivities. In those observations the ionically conducting PEO domain consists of short PEO chains that can accommodate high salt concentrations. From the preparation of the lamellae there remains non–volatile Tetrahydrofuran (THF). We employ Molecular Dynamics (MD) simulations to understand the ion transport mechanism and compare our findings to earlier MD simulations of classical PEO-based SPEs. First conjectures on the role of the remaining THF are presented.