Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 67: SYLI: Symposium Interfacial Challenges in Solid-State Li Ion Batteries - defects, structure and thermodynamics

O 67.3: Vortrag

Mittwoch, 22. März 2017, 10:45–11:00, IFW A

Ion channelling contrast to reveal structure and growth behaviour of LiNi0.5Mn1.5O4 battery materials — •Manuel Mundszinger1, Tobias Wälde1, Jörg Bernhard1, Michael Kinyanjui1, Marilena Mancini2, Peter Axmann2, Margret Wohlfahrt-Mehrens2, Ute Golla-Schindler1, and Ute Kaiser11Ulm University, Central Facility for Electron Microscopy, Group of Electron Microscopy of Materials Science, Albert-Einstein-Allee 11, 89081 Ulm, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), Helmholtzstrasse 8, 89081 Ulm

Ion channelling contrast [1] was utilized to characterize the crystallinity and crystalline architecture of LiNi1.5Mn0.5O4 particles [2] for battery cells. The LiNi0.5Mn1.5O4 particles were cut by the focused ion beam (FIB) machine; then the FIB was used to produce channelling contrast revealing the polycrystallinity of the material, allowing to determine grain size distribution and architecture. For systematic investigations, differently sized particles (10-30 micrometre in diameter) were examined. We found that with increasing particle size the number and the average size of the grains increases. This allows to conclude that during growth new grains are formed as well as existing grains grow. SAED and HRTEM reveal that the structure is cubic. Ion channelling contrast and EBSD contrast were compared showing very similar results. This work was done in the LiEcoSafe project funded by the BMBF (03X4636C).

[1] C. A. Volkert et al, MRS Bulletin, 32:389-399, 5, 2007.

[2] P. Axmann et al, Journal of Power Sources 301 (2016) 151-159.

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