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In the era of all-solid-state-battery (ASSB) technology a solid-state Lithium Super
Ionic Conductor (SIC) would be the holy grail. The highest achievable Lithium-ion
conductivity (>12 mScm−1
) in sulfur based framework Li10GeP2S12 (LGPS), makes it a
potential solid electrolyte. Despite the successful identification, it cannot be integrated
to real battery setup due to the interfacial instability, inherent redox-instability and
moisture-sensitivity generating the H2S gas. In contrast to sulfides, moisture-resistant
oxygen analogue exhibits poor Li-conductivity.
In this talk, I will present a theoretical strategy to overcome these well known
problems. More specifically, we have identified that specific moieties for oxygenation
and sulfuration lead to a design principle for a unique oxysulfide class of Li-superionic
conductor (Li-SIC). Synergy of O-S mixing chemistry would enable the engineering
and search for next generation electrolyte materials with desirable safety and high ionic
conductivity. The novel concept of higher O-content without limiting Li-ion conduction
could open up a new avenue of broad compositional space for stable Li-SIC.
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