Abstract
Interfacial phenomena of oxide cathode/sulfide electrolytes are crucial for the improvement of energy density and cycle stability of all-solid-state batteries. Thin-film batteries provide a simple reaction field for mechanistic studies. We fabricated a model film battery consisted of LiCoO2 cathode, LiNbO3 buffer layer, amorphous Li3PS4 electrolyte, and Li metal anode by physical vapor deposition. Structural changes at the cathode-side interface were investigated by in situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) using Ar etching. The LiCoO2 lattice showed a reversible change under high voltage operation with the upper cutoff voltage of 4.5 V. A cathode electrolyte interphase (CEI) layer was formed at the interface by decomposition of LiNbO3 and Li3PS4. The ionic and electronic conductivities of the CEI layer could be crucial to improve the reaction resistance and the cycle stability of the oxide cathode/sulfide electrolyte interface.
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Hirayama, M., Suzuki, K., Kanno, R., Masuda, T., Tamura, K. (2021). Characterization of Cathode/Sulfide Electrolyte Interface Using a Thin-Film Model Battery. In: Kanamura, K. (eds) Next Generation Batteries. Springer, Singapore. https://doi.org/10.1007/978-981-33-6668-8_16
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DOI: https://doi.org/10.1007/978-981-33-6668-8_16
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