Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 19: Battery Materials

MM 19.4: Vortrag

Dienstag, 13. März 2018, 11:00–11:15, H 0106

Alkali metal insertion into TiO2 based ternary oxides — •Marketa Zukalova — J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i. Dolejškova 3, CZ-18223 Prague 8, Czech Republic

The TiO2-based nanomaterials have triggered great excitement, because of their interesting structural characteristics and potential applications in energy conversion and storage. Among others, monoclinic modification of titanium dioxide (TiO2B) and Li4Ti5O12 spinel were investigated as lithium and sodium storage anode materials, Na2Ti3O7 was reported as the lowest voltage oxide material for sodium-ion batteries anode. Numerous Li insertion studies into TiO2-based materials revealed a dependency of its electrochemical behavior on morphology (particle size, surface area). In our work we demonstrate the excellent performance of sol-gel made nanocrystalline Li4Ti5O12 and Na2Ti3O7 during alkali metal insertion. Nanocrystalline Li4Ti5O12 exhibits the best performance for Na storage, its charge capacities reach 156 mAhg-1 and are twice as high as those of reference Aldrich LTS. The sol gel made Na2Ti3O7 exhibits discharge capacities of 109, 86 and 63 mAh g-1 at charging rates 1, 2 and 5C respectively, with 100% coulombic efficiency and zero capacity drop over 50 cycles after initial conditioning.