Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster session II
MM 26.21: Poster
Dienstag, 8. März 2016, 18:30–20:30, Poster B3
In situ TEM Interfacial Electrochemistry of Fluoride Ion Batteries — Mohammed Hammad1,2, •Mohammad Saleh Gorji1,2, Venkata Sai Kiran Chakravadhanula1,2,3,4, M. Anji Reddy1,3, Carine Rongeat1, Torsten Scherer1,4, Horst Hahn1,2,3, Maximilian Fichtner1,3, and Christian Kübel1,3,4 — 1INT, Karlsruhe Institute of Technology (KIT), Germany — 2TU Darmstadt, Germany — 3HIU, KIT, Germany — 4KNMF, KIT, Germany
In situ transmission electron spectroscopy provides high spatial resolution visualization of battery operations in real time, giving an important insight on the electrochemistry of batteries. Fluoride ion batteries have a great potential to be an alternative to the conventional Li ion batteries because of the high electronegativity and comparable low atomic weight of the fluorine. In this study, the structural properties of a micron-sized all-solid-state fluoride ion battery at the interfaces between electrolyte and electrodes, and their degradation mechanisms during cycling, have been investigated by in-situ TEM. Ball milling was used to prepare the La0.9Ba0.1F2.9 electrolyte and the cathode was a composite of Cu and C and the anode a composite of MgF2, Mg, La0.9Ba0.1F2.9 and C. The battery was cycled between 0 V to 3.5 V. HRTEM micrographs revealed the formation of CuF2. Additionally, morphological changes observed at the interfaces are presented.