Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 61: Charged Soft Matter, Ionic Liquids and Polyions II

CPP 61.4: Talk

Thursday, March 23, 2017, 15:45–16:00, ZEU 114

Improving the Lithium Ion Transport in Polymer Electrolytes by Functionalized Ionic-Liquid Additives — Diddo Diddens^1,2, Volker Lesch¹, and •Andreas Heuer^1,2 — ¹Helmholtz-Institut Münster (IEK-12), Ionics in Energy Storage, Forschungszentrum Jülich GmbH, Corrensstraße 46, 48149 Münster, Germany — ²Institut für physikalische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, 48149 Münster, Germany

Polymer electrolytes consist of a salt dissolved in an amorphous polymer matrix, resulting in mechanically stable and flexible ion conductors. Unfortunately, their conductivity is too low for their use in modern energy storages. To overcome this deficiency, the addition of a low-molecular additive such as an ionic liquid (IL) has been proposed, however, the resulting enhancement is rather modest. Our recent work [1] demonstrated that this stems from the fact that the lithium ions remain coordinated to the slow polymer chains, which move only slightly faster due to the plasticization by the IL. To decouple the lithium ions from the macromolecular host, the use of a functionalized IL with chemically tethered oligomer chains that directly coordinate to the lithium ions has been suggested. We employ Molecular Dynamics simulations to investigate the lithium ion transport mechanism in these improved materials, and compare the results to conventional polymer electrolytes within the framework of our previously developed Rouse-based model [1].

[1] D. Diddens, A. Heuer, ACS Macro Lett., 2013, 2(4):322-326