Innovations in scalable electrode processing for thiophosphate-based all-solid-state-batteries


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All-solid-state lithium-ion batteries are promising candidates to overcome safety and energy limitations of common lithium-ion batteries. Although excellent results have been reported for sulfide based electrolytes on a small scale, it is complicated to reproduce the same performance in a larger cell. In this lecture, scalable concepts for high energy anodes are presented. We combined the solid-state technology with PVD-based, scalable silicon anodes developed at Fraunhofer IWS. The columnar structure of the anode exhibits a 1D breathing mechanism similar to lithium, which preserves the interface toward the electrolyte. Stable cycling is demonstrated for more than 100 cycles with a high coulombic efficiency (CE) of 99.7–99.9% in full cells with industrially relevant areal loadings of 3.5 mAh cm−2, which is the highest value reported so far for ASSB full cells with silicon anodes. The solid SEI at the anode electrolyte interface tremendously increases the capacity retention of the cells, which was further investigated by impedance spectroscopy.

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