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Electrochemical processes in all-solid-state Li-S batteries studied by electrochemical impedance spectroscopy
- Source :
- Solid State Ionics, Solid State Ionics, 2021, 368, pp.115680. ⟨10.1016/j.ssi.2021.115680⟩, Solid State Ionics, Elsevier, 2021, 368, pp.115680. ⟨10.1016/j.ssi.2021.115680⟩
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
Abstract
- International audience; Understanding the electrochemical processes in all-solid-state lithium‑sulfur batteries is essential for designing high-performance devices. Here, the evolution of the electrochemical impedance spectra of an all-solid-state lithium‑sulfur battery during one charge/discharge cycle was quantitatively investigated with a reasonably established equivalent circuit. The impedance spectra could be decomposed into several parts as follows: the bulk resistance of solid electrolyte and current collector at highest frequency, three semicircles from high to low frequency corresponding to the dynamic processes at different interfaces and a 45° straight line followed by an inclined small tail at low frequency. It is found that the middle frequency semicircle, corresponding to charge transfer at the cathode, varied obviously during the charge/discharge cycle. Moreover, the 45° straight line, which is attributed to the Li diffusion in the cathode material LixS based on qualitative analysis, dominates the impedance spectra, revealing that the main kinetics-limiting factor is the Li diffusion in the active materials. Finally, an electrochemical model of the battery is proposed which provides insight for the designing of high-performance all-solid-state lithium‑sulfur batteries.
- Subjects :
- Battery (electricity)
Materials science
Lithium–sulfur battery
02 engineering and technology
Electrolyte
010402 general chemistry
Electrochemistry
01 natural sciences
law.invention
Mechanism model
law
[CHIM]Chemical Sciences
General Materials Science
Diffusion (business)
General Chemistry
All-solid-state battery
021001 nanoscience & nanotechnology
Condensed Matter Physics
Cathode
0104 chemical sciences
Dielectric spectroscopy
Chemical physics
Lithium‑sulfur battery
Equivalent circuit
0210 nano-technology
Electrochemical impedance spectroscopy
Subjects
Details
- Language :
- English
- ISSN :
- 01672738
- Database :
- OpenAIRE
- Journal :
- Solid State Ionics, Solid State Ionics, 2021, 368, pp.115680. ⟨10.1016/j.ssi.2021.115680⟩, Solid State Ionics, Elsevier, 2021, 368, pp.115680. ⟨10.1016/j.ssi.2021.115680⟩
- Accession number :
- edsair.doi.dedup.....65c47af213e0a424a3a133e28ac52812