Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster 2
CPP 17.28: Poster
Dienstag, 6. September 2022, 11:00–13:00, P2
Sol-gel based tailored lithium-ion battery electrodes — •Ivana Pivarníková1,2, Ralph Gilles1, and Peter Müller-Buschbaum1,2 — 1MLZ, TU München, 85748 Garching — 2TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching
Silicon based materials have been considered as one of the most promising candidates for the next-generation lithium-ion battery anodes, thanks to its low cost, non-toxicity and high theoretical gravimetric capacity (4200 mAh/g). One of the concepts for a suitable application is to design the mesoporous Si-based material via copolymer assisted sol-gel synthesis. This wet chemical method consists of the formation of the organic-inorganic composites by a self-assembly mechanism, where the organic phase (PEO-b-PPO-b-PEO non-ionic triblock copolymer) serves as a template for the inorganic structure (SiOx). The tetraethoxysilane (TEOS) is used as a Si precursor. The solution mix is spin-coated onto the cleaned Si substrates and the removal of the template is done by calcination at high temperature (400 °C). The properties of the thin films can be tuned by adjusting the synthesis conditions such as concentration of the reaction compounds, choice of the deposition technique, choice of the final calcination step or choice of additives. The aim is to reach the desired thickness, porosity, conductivity and mechanical stability for a successful Li-ion battery anode application. The produced thin films are characterized by scanning electron microscopy (SEM), grazing incidence small-angle X-ray scattering (GISAXS), profilometry and ellipsometry measurements.