Berlin 2024 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Energy Storage and Batteries I
CPP 1.5: Vortrag
Montag, 18. März 2024, 10:45–11:00, H 0106
Operando neutron diffraction experiments in order to investigate the lithiation and ageing mechanism of industrial scale multi-layer 5 Ah pouch cells — •Thien An Pham1,3, Stefan Seidlmayer1, Ivana Pivarnikova1,3, Sven Friedrich4, Alessandro Sommer5, Christophe Didier2, Andreas Jossen4, Rüdiger Daub5, Vanessa Peterson2, Peter Müller-Buschbaum1,3, and Ralph Gilles1 — 1TUM, MLZ, 85748 Garching, Germany — 2ANSTO, Lucas Heights, Australia — 3TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 4TUM School of Engineering and Design, Chair of Electrical Energy Storage Technology , 80333 Munich, Germany — 5TUM School of Engineering and Design, Institute for Machine Tools and Industrial Management, 85748 Garching, Germany
The demands for Li ion batteries are increasing and the improvement of battery performances remains one of the main goals of the research. Currently, switching to materials offering higher materials is one approach to achieve higher capacities. Here, the lithiation mechanism and ageing behaviour of silicon anodes and LiNi0.8Co0.15Al0.05O2 (NCA) cathodes in multi-layer 5 Ah pouch cells were studied with neutron diffraction. The batteries were fabricated on a research production line in order to replicate the conditions of commercial cells as close as possible. Uncylced cells were compared to an aged cell at a state of health of 60 percent. Due to ageing, the capacity is decreased, which can be seen in the evolution of the cell parameters of NCA. During relaxation the NCA peaks are shifting indicating structure changes.
Keywords: multi-layer pouch cells; neutron diffraction; NCA cathode material; operando measurement