Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

Neutron Depth Profiling at the PGAA facility of MLZ

Dec 9, 2020, 2:30 PM
3h 30m
Online event

Online event

Speaker

Robert Neagu

Description

Neutron Depth Profiling (NDP) is a non-destructive, isotope-specific, high-resolution nuclear analytical technique, which is often used to probe profiles of lithium, nitrogen, boron, helium and several additional light elements concentration in different host materials. The N4DP experiment is located at the Prompt Gamma Activation Analysis (PGAA) facility of Heinz Maier-Leibnitz Zentrum (MLZ), which provides a cold neutron flux up to $5\times10^{10}\,$s$^{-1}$cm$^{-2}$. When a neutron is captured by a $^{6}$Li nucleus, the system emits an alpha particle at a well-defined energy. The loss of the charged particle traveling through the host material is related to the depth of origin at a resolution level up to a few ten nanometers.

After a short introduction to the existing N4DP facility, we will present the status of the ongoing upgrade towards its full functionality to study the lithium-ion concentration gradient in energy storage systems, i.e. Li-ion batteries. Here, NDP reveals new insights into the evolution of the lithium accumulation in different silicon-graphite anode compositions. The evolution of immobilized lithium could directly be measured, which is one of the main causes of battery lifetime limitation. This project is supported by the BMBF, Contract No. 05K19WO8.

Primary author

Co-authors

Markus Trunk Lukas Werner (TUM) Roman Gernhäuser (TU-München) Ralph Gilles Zsolt Revay (PGAA) Erfan Moyassari Sardehaei (Institute for Electrical Energy Storage Technology (EES), Technical University of Munich (TUM)) Luiza Streck (Institute of Electrical Energy Storage Technology (EES), Technical University of Munich (TUM)) Neelima Paul (Technical University of Munich, Heinz Maier-Leibnitz Zentrum (MLZ)) Bastian Märkisch (Physik Department, TU München)

Presentation materials

There are no materials yet.