Journal
BATTERIES & SUPERCAPS
Volume 3, Issue 7, Pages 647-652Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.201900218
Keywords
electrode-solid electrolyte interface; electrochemistry; in situ Raman microscopy; interfaces; solid-state batteries
Funding
- [EP/R042047/1]
- EPSRC [EP/S003053/1] Funding Source: UKRI
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Sulfide-based Li+ conducting solid electrolytes, such as argyrodite, Li6PS5Cl, for all-solid-state batteries can have comparable ionic conductivities with liquid electrolytes. However, the interface between sulfide containing solid electrolytes and Li metal and Li-ion positive electrodes has been found to be unstable, leading to poor cell performance and cycling. Understanding the in situ evolution of interfacial layers between the electrolyte and both electrodes is of paramount importance for designing stable and long-life solid-state batteries. Here, in situ Raman microscopy was used to study the interface between Li6PS5Cl electrolyte and metallic Li and LiCoO2. Under potential control, Raman microscopy identified the appearance of degradation products (Li2S, P2Sx and polysulfides) at the electrode/solid electrolyte interface.
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