In many cases, the diagnostics of (electro)chemical processes in rechargeable batteries is only possible in the environment of an assembled or even cycling cell, i.e., in situ or operando, to assure that the system under investigation is representative for an operating battery and is not changing over time or by external influences. In the context of this thesis, two novel analytical methods are presented: a micro-reference electrode for in situ electrochemical impedance measurements (EIS) in sodium ion batteries (SIBs) and an operando Neutron Depth Profiling (NDP) cell to record the time- and spatially resolved lithium concentration across lithium-ion battery (LIB) electrodes.
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In many cases, the diagnostics of (electro)chemical processes in rechargeable batteries is only possible in the environment of an assembled or even cycling cell, i.e., in situ or operando, to assure that the system under investigation is representative for an operating battery and is not changing over time or by external influences. In the context of this thesis, two novel analytical methods are presented: a micro-reference electrode for in situ electrochemical impedance measurements (EIS) in so...
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