Dresden 2017 – wissenschaftliches Programm
CPP 51.7: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Nanoporous titania/silica hybrid electrodes for lithium-ion batteries — •Kejie Zhang, Ezzeldin Metwalli, Thomas Kaps, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching
Light-weight, high energy density, stable and flexible solid-state lithium ion micro-batteries are of great importance due to its applications for miniature medical devices such as capsule endoscopes, implantable heart pumps and biosensors. The sol-gel template method synthesized nanostructured hybrid flexible thin film electrodes of titania (TiO2) with silica (SiO2) are expected to inherit titania's high charge/discharge rate, stability and good cyclability with silica's high gravimetric capacity and low potential. Different ratio of TiO2/SiO2 porous electrodes were prepared using different ratios of precursors and different weight ratio of polystyrene-block-polyethylene oxide (PS-b-PEO) diblock copolymer (DBC) guiding template. Here, lithium salt doped DBC is sandwiched between a developed TiO2/SiO2 anode and typical lithium cobalt dioxide cathode. Charge/discharge cycling capacity and impedance measurements after each cycle were acquired to characterize the stability, cyclability and capacity development of the assembled lithium-ion microbatteries. Small and wide angle X-ray scattering (SAXS/WAXS) were used for determination of the structures of free-standing TiO2/SiO2 nanoporous hybrid electrodes. The structure-property correlation of these hybrid electrodes are discussed.