Abstract
AbstractAll‐solid‐state batteries (ASSBs) using inorganic superionic conductors are considered a safer alternative to the current lithium ion battery technology. And tackling the issue of interfacial stability between the solid‐state electrolyte and electrode active material is a critical step to achieving sustainable ASSBs. In this work, we applied a TiO2 surface coating on LiNi0.8Mn0.1Co0.1O2 (NMC811) particles through a dry‐coating process, and subsequently heat‐treated the TiO2‐coated materials. We systematically characterized the changes to the material after the coating and heating processes, and we explored the role of TiO2 coating and heat‐treatment on the electrochemical cycling of NMC811 in a sulfide‐based ASSB. The coating and heat treatment resulted in Ti doped into the NMC811 surface, which reduced undesired side reactions and improved cycling stability. Capacity retention of the doped material was 55 % at 50 cycles, versus 11 % in the un‐doped material. The observations in this study provide an alternative approach toward enhancing the interfacial stabilities between high‐energy NMC materials and sulfide‐based solid‐state electrolyte.
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