| 초록 |
All-solid-state batteries (ASSBs) using solid electrolyte (SE) is one of alternative systems, and sulfide based SE could be comparable to liquid electrolyte level in terms of ionic conductivity. Among the various sulfide-based SE, Li6PS5Cl (LPSCl) have been considered as promising SE because of its high ionic conductivity (3x10-3 S cm-1) at room temperature. Here in this study, we investigated deterioration factors that originated from not only electrolyte decomposition at composite cathode but also cathode structural deterioration. In particular, XRD analysis revealed that phase transition analysis from layered R(-)3m phase to the spinel phase Fd(-)3m especially interface between cathode and electrolyte, and this result could be supported by TEM. We will discuss further more in detail what the reason is to occur capacity degradation with above and additional analysis tool.
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