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

MM: Fachverband Metall- und Materialphysik

MM 34: Hydrogen in Materials I

MM 34.5: Vortrag

Donnerstag, 12. März 2026, 16:45–17:00, SCH/A215

Understanding of hydrogenation induced planar defects in a proton-based battery material — •Yujun Zhao, Stefan Zaefferer, Yug Joshi, and Dierk Raabe — Max-Planck-Institut für Nachhaltige Materialien, Max-Planck-Straße 1, 40237 Düsseldorf, Deutschland

Research on nickel-metal hydride batteries provides valuable insights for advancing hydrogen storage systems. However, the battery cycle stability is limited by crystalline defects generated during hydrogenation. Therefore, an in-depth understanding of these defects is critical for improving the long-term cyclic performance of electrode materials. In this work, electrochemically charged hydrogen induces the formation of planar defects and dislocation bands in LaNi5 intermetallic compound. The correlations among crystallographic orientations, defect characteristics, and local hydrogen concentration were explored by multiscale characterization techniques, including electron backscattered diffraction (EBSD), electron channeling contrast imaging (ECCI), transmission electron microscopy (TEM), and atom probe tomography (APT). In particular, the atom probe evaporation behavior of LaNi5 along different orientations are revealed, clarifying the local magnification effect and the loss of spatial resolution. The influences of the planar defects on the evaporation behaviors of metallic elements and hydrogen atoms are also discussed.

Keywords: microstructure; defects; proton batteries; electron microscopy; atom probe tomography