Dresden 2020 – wissenschaftliches Programm
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MM 56.2: Vortrag
Donnerstag, 19. März 2020, 12:00–12:15, IFW D
Laser-assisted atom probe tomography (APT) study on the lithiation behavior in the conversion reaction of CuO as an anode in lithium ion battery — •Jianshu Zheng, Patrick Stender, and Guido Schmitz — Chair of Materials Physics, Institute of Materials Science, University of Stuttgart, Heisenbergstr. 3, D-70569 Stuttgart, Germany
The lithiation behavior in conversion reaction of CuO as an anode in lithium ion battery is investigated by the laser-assisted atom probe tomography (APT). For this purpose, the CuO thin film is firstly prepared by ion beam sputtering, then lithiated to various conversion states via electrochemical techniques, afterwards lifted out and glued onto Tungsten post, and further shaped into sharp tip with diameter smaller than 100 nm by focus ion beam, before it is finally measured in laser-assisted APT. The following reconstruction on the resultant data provides the 3D coordinates of atoms in real space, enabling us to view the distribution of atoms and concentration profiles within certain volumes. Three conversion states in the first cycle of CuO are studied, where in the initial, intermediate, and fully conversion states, lithium clusters, a mixed compound CuOLix (0<x<2), and nanometer-scaled metallic Cu particles in Li2O matrix are observed, respectively. With the advantage of APT, the size distribution of Cu particles and the concentration profile across the Cu/Li2O interface are obtained, revealing the structure and concentration evolution of Cu particles in Li2O matrix. Based on the above results, a model on the diffusion pathway and kinetics of lithium ions is created.