Abstract
All solid-state batteries (ASSBs) potentially offer safe electrochemical energy storage as they do not require the liquid organic electrolyte. However, in order to achieve high energy densities that are competitive with conventional lithium ion cells, Li metal anodes are required. Even when nominally pin-hole free ceramic membranes are used, issues surrounding Li microstructural growth and subsequent cell death persist, particularly at high current densities. The use of 7Li magnetic resonance chemical shift imaging to track Li microstructural growth in solid electrolytes will be discussed in this talk. Applications to garnet solid-electrolyte will be described. We follow the early stages of Li microstructural growth during electrochemical cycling – from the formation of Li on the electrode surface to dendritic Li connecting both electrodes in a symmetrical cell and correlate these changes with electrochemistry (e.g. short circuiting). At low current densities, 7Li MRI detects the formation of Li microstructures in cells before obvious electrochemical signatures indicating their presence are observed.
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