Operando neutron reflectometry of lithiated silicon protected by an artificial SEI
Silicon electrodes for Li-batteries have a ten times higher gravimetric energy density than current graphite electrodes. They consist of nonhazardous, abundant raw materials, which are widely used in industry. This electrode has also possible applications in future battery systems, for example Lithium-Sulfur batteries. The major drawback of this electrode system is the strong capacity. The silicon electrode is lithiated and serves as a lithium reservoir. It was shown that Aluminum oxide is a stable artificial SEI, which hinders electrolyte decomposition. To further improve the performance of silicon electrodes the formation and stability of the SEI-layer on the silicon anode and the migration of lithium in and out of the anode needs to be investigated. This knowledge helps to improve the long-term performance of this electrode system. Neutron Reflectometry (NR) is an excellent tool for these investigations.We want to investigate the (de-)lithiation of a crystalline silicon electrode coated with 5nm of AlOx with operando NR and impedance spectroscopy over several (e.g. 10) cycles. This work is the last part of the PhD-thesis of Arne Ronneburg.
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Ronneburg, A.; BALLAUFF Matthias; CUBITT Robert; RISSE Sebastian and SILVI Luca. (2018). Operando neutron reflectometry of lithiated silicon protected by an artificial SEI. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-138
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