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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster 2
CPP 17.29: Poster
Dienstag, 6. September 2022, 11:00–13:00, P2
Silicon-germanium based coating of anodes for Lithium-ion batteries — •Kexin Wu1, Christian L. Weindl1, and Peter Müller-Buschbaum1,2 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2MLZ, TU München, 85748 Garching
Lithium-ion batteries (LIBs) have received increasing attention over several decades as an indispensable role in energy storage. The application of silicon anodes is hindered by their volumetric expansion after full lithiation, which causes collapse with three failure mechanisms including electrode pulverization, disconnection between the electrode and current collector, and continuous breaking and re-growth of the solid electrolyte interface (SEI) layer. To tackle this critical issue, the construction of hierarchical structures is a promising way to increase the stability of active materials. In our studies, Si/Ge hierarchical structures are built by chemical templating of pre-nanostructure self-assembled polystyrene nanoparticles, using an amphiphilic polystyrene-block-polyethylene oxide (PS-b-PEO) diblock copolymer as structure-directing agent. The diblock copolymers undergo microphase separation, which is further modified by solvent vapor annealing with dichloromethane (DCM) and SiCl4. By pyrolysis, mesoporous thin films are achieved. The desirable morphological and crystallographic studies are accomplished by GISAXS) SEM, AFM, and GIWAXS) The study is completed by galvanostatic cycling tests and impedance spectroscopy.