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Nuclear magnetic resonance (NMR) investigations of electrochemical systemsrequire gas-tight and non-metallic cell housings. This contribution reports onthe development and evaluation of a cylindrical battery container incombination with a numerically optimized saddle coil that is suitable for NMRinvestigations of battery cells over hundreds of charge-discharge cycles. Thereliability of the new cell container design and its long-time gas-tightsealing are shown by rate capability comparisons to standard housings withLiCoO$_{2}$ (LCO) vs. Li-metal electrodes as well as a charge-dischargeexperiment of a LCO vs. graphite batteries over more than 2000 hours. Todemonstrate the performance of the entire NMR setup, long-run in-operandomeasurements on a Li-metal vs. graphite cell are presented. The NMR data revealthe formation and evolution of mossy and dendritic Li microstructures over aperiod of 1000 h. Analyzing the measured rate of microstructure growth couldhelp to identify dendrite mitigation strategies, such as enhanced cell pressureor additives, and could enable a method for battery lifetime prediction.

Long-run in-operando NMR to investigate the evolution and degradation of battery cells