Publication date: 10th April 2024
Inhomogeneous metal plating in batteries not only results in irreversible capacity losses, but also poses a serious safety concern for their operation. Dendritic growth of plated metal can cause internal short circuits and catastrophic failure of the cell [1]. Understanding the transport conditions that lead to heterogeneous metal deposition is essential for the development of a safer lithium-ion battery. Scanning Electrochemical Microscopy (SECM) is a scanning probe technique which is increasingly being used in battery research to characterise the heterogeneity of the solid electrolyte interphase (SEI), the transport properties of which directly affect the morphology of the plated metal [2]. Here we present a study linking the heterogeneity of an SEI to metal electroplating and battery performance using zinc as a model compound. Zinc is an ideal candidate for this study, as it has been shown to form an SEI and can be used in an aqueous electrolyte [3]. We present a comprehensive study demonstrating how different additives to the electrolyte affect the heterogeneity of the SEI and therefore impact metal electroplating within the cell. This research aims to provide a methodology to predict and prevent where inhomogeneous metal plating will occur and aid a strategy for mitigating dendrite induced failures.
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