Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 2: Symposium Interfacial Challenges in Solid-State Li Ion Batteries

O 2.4: Hauptvortrag

Montag, 20. März 2017, 11:15–11:45, HSZ 02

Neutron diffraction on solid-state battery materials — •Helmut Ehrenberg¹, Anatoliy Senyshyn², Mykhailo Monchak¹, Sylvio Indris¹, and Joachim Binder¹ — ¹Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM) — ²Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universitaet Muenchen, Garching, Germany

Solid-state batteries are a promising approach to safer electrochemical energy storage and higher energy densities. Bottle necks are interface reactions and transport limitations in the solids. Advanced and optimized materials must provide dedicated properties, for example a good Li-ion conductivity for sufficiently high current densities and only small volume changes to preserve mechanical integrity. Neutron diffraction offers unique features to elucidate the underlying structure-property relationships, which determine the resulting performance parameters on cell level. Selected examples are shown, which demonstrate the capabilities of neutron diffraction to reveal Li-ion diffusion pathways as in the Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) superionic conductor, Li occupation numbers at intermediate states of charge as for LiCoPO₄ or a comparison of volume changes between commercial and alternative zero-strain electrode materials. The capabilities of solid-state batteries are discussed.