München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Instrumentation XI, Accelerators and Applications
HK 52.6: Vortrag
Donnerstag, 21. März 2019, 15:30–15:45, HS 11
Applications of Neutron Depth Profiling at the N4DP Instrument at the Heinz Maier-Leibnitz Zentrum — •Markus Trunk1, Lukas Werner1, Bastian Märkisch1, Ralph Gilles2, Zsolt Revay2, Morten Wetjen3, Fabian Linsenmann3, Hubert Gasteiger3, and Roman Gernhäuser1 — 1TUM, Physik Department, Garching b. München — 2TUM, Heinz Maier-Leibnitz Zentrum, Garching b. München — 3TUM, Lehrstuhl für Technische Elektrochemie, Garching b. München
Neutron Depth Profiling (NDP) is a non-destructive, isotope-specific, high-resolution nuclear analytical technique, which is often used to probe lithium or boron concentration profiles in different host materials. The presented N4DP experiment is carried out at the PGAA facility of Heinz Maier-Leibnitz Zentrum, which provides a cold neutron flux up to 5E10 s-1cm-2. When a neutron is captured the investigated Li-6 nuclei undergo nuclear reactions and emit charged particles with well-defined energies and the energy loss of the charged particles traveling through the host material is related to the depth of origin at a resolution level up to a few ten nanometers. We investigated NDP on several applications such as heat-treated superalloys with boron additives and OLED prototypes with lithium. In this contribution lithium concentration profile measurements in different lithium-ion battery components are presented. Here NDP reveals new insights into the evolution of immobilized lithium in battery electrodes, which is one of the main causes of battery lifetime limitation.