SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Charged Soft Matter, Polyelectrolytes and Ionic Liquid

CPP 53.6: Vortrag

Donnerstag, 30. März 2023, 16:45–17:00, ZEU 255

Grazing incidence x-ray scattering on lithium iron phosphate electrodes with polymer blend binders — •Fabian A.C. Apfelbeck1, Julian E. Heger1, Tianfu Guan1, Matthias Schwartzkopf2, Stephan V. Roth2,3, and Peter Müller-Buschbaum1,41TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching — 2DESY, 22607 Hamburg — 3Royal Institute of Technology KTH, 100 44 Stockholm — 4MLZ, TU München, 85748 Garching

Lithium iron phosphate (LFP) is a widely used cathode for lithium ion batteries especially in vehicles due to its low cost, high safety, long cycle life and low toxicity. However, so far structural investigations are mainly limited to x-ray diffraction (XRD) techniques. In this project, we extend the investigation of these electrodes to grazing incidence techniques. Therefore, we study electrodes which consist of the active material lithium iron phosphate, carbon black as conducting agent and the polymeric binder polyvinylidenfluorid (PVDF). Additionally, we prepare several binder blends of the neutral PVDF and the single-ion conducting polymer poly(trifluoromethane) sulfonimide lithium styrene) (PSTFSILi) since it is known, that a 1:1 wt% mixture of PVDF and a single-ion conducting polymer results in superior battery performance. We measure grazing incidence small/wide angle x-ray scattering (GISAXS/GIWAXS) and based on these data, we can understand the influence of the binder on the structure of the electrode. We can correlate ex-situ the morphological and structural data (GISAXS/GIWAXS) with electrochemical results (EIS).

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