Robust solid-state interface with a deformable glass interlayer in sulfide-based all-solid-state batteries
- Robust solid-state interface with a deformable glass interlayer in sulfide-based all-solid-state batteries
- 김병국; 이종호; 김형철; 지호일; 양성은; 박상백; 전민재; 최성준; 정으뜸; 상병인
- Elastic interface layer; Metallic electrode; Glass sulfide; Li-ion conductor; All-solid-state battery
- Issue Date
- Solid state ionics
- VOL 346-115217-6
- We introduced a new elastic interface layer (EIL), (Li2S)0.75(P2S5)0.25 glass, in all-solid-state batteries (ASSBs) to improve the solid-state interfacial structure, and analyzed its structural evolution in electrochemical charge/discharge cycles. This EIL had a lower bulk modulus, thereby providing good powder processability and high mechanical deformability against volume changes of the electrode. Compared to a cell configuring EIL, the reference cell exhibited a considerable increase in the electrolyte resistance; moreover, a new resistance component was identified in the high-frequency region (500– 50 kHz). This high-resistance component resulting from interfacial deterioration such as metal fragmentation and micropore formation was successfully suppressed by applying a mechanically deformable EIL. We believe that this study would provide insights into the application of EIL for configuring a stable interface with a metallic electrode in ASSBs.
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