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The occurrence of metallic film deposition without external power supply onthe copper current collector of a zinc air battery half-cell containing zincslurry is investigated. Therefore, test specimens of miscellaneous materialsrepresenting the current collector are immersed in a commercial available zincslurry as well as an in self-prepared zinc slurry. In case of copper and metalswhich are more noble (silver and gold), a coating on the respective specimen isobtained. An element mapping of the coated copper specimen is performed bymeans of scanning electron microscopy (SEM) and energy dispersive x-rayspectroscopy (EDX) identifying that the coating layer consists of zinc andoxygen. In order to clarify the crystal structure and the exact composition,focused ion beam (FIB) and x-ray photoelectron spectroscopy (XPS) measurementsare applied, proving that the layer consists of elemental zinc, which, ismerely oxidized on the surface. Finally, a reaction mechanism for thereversible zinc film deposition is proposed.

Unwanted electroless zinc plating on current collectors in zinc air batteries