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MM: Fachverband Metall- und Materialphysik
MM 52: Materials for Energy Storage and Conversion - Ion Diffusion
MM 52.1: Vortrag
Donnerstag, 19. März 2020, 10:15–10:30, IFW D
measurement of Li mobility in lithium iron phosphate by APT at different field strength — •Ahmed Abdelkarim1, 2, Patrick Stender1, and Guido Schmitz1 — 1Institute for Materials Science, Department for Material Physics, Stuttgart University, Stuttgart, Germany — 2Spectroscopy Department, Physics Division, National Research Center (NRC), Cairo, Egypt
Lithium is considered to be the cornerstone of the energy storage in batteries. However, even for well- studied lithium insertion compounds such as Lithium Iron Phosphate (LFP) it is profoundly unclear how the ionic transport appears on a microscopic, even on atomic level scale. Ionic transport is 3 dimensionally studied by Atom Probe Tomography (APT). New unique insights into the mechanisms of Li movements have been provided. Through self-created fine columnar pathways, Li is pulled and Li enrichment/depletion regions are observed. It is demonstrated that this in-situ Li motion is dependent on the field strength of the measurements. In response to the applied fields, Li ions are undoubtedly redistributed. By mathematically modelling, the Li diffusion process is evaluated. Li diffusion in amorphous LFP shows a faster diffusion than crystalline over the whole laser range and is calculated to be a factor of about 100 faster at laser power 30 mW.