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Kinetics of Interfacial Lithium-ion Transfer between a Graphite Negative Electrode and a Li2S-P2S5 Glassy Solid Electrolyte (Supporting Information)

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posted on 22.02.2022, 06:07 authored by Danni YU, Meiqi HUANG, Yuto MIYAHARA, Kohei MIYAZAKI, Akitoshi HAYASHI, Masahiro TATSUMISAGO, Takeshi ABE, Tomokazu FUKUTSUKA
All-solid-state lithium-ion batteries that use sulfide solid electrolytes have attracted much attention due to their high safety and wide electrochemical window. In this study, highly oriented pyrolytic graphite (HOPG) and 75Li2S-25P2S5 (mol%) glass were used as a model graphite negative electrode and a sulfide solid electrolyte, respectively. Interfacial lithium-ion transfer between 75Li2S-25P2S5 glass and the HOPG electrode was studied by AC impedance spectroscopy measurements. The activation energy of the interfacial lithium-ion transfer was estimated to be around 37 kJ mol−1, which was much smaller than that at the interface between organic liquid electrolytes and HOPG electrode, indicating that the lithium-ion transfer at the interface between 75Li2S-25P2S5 glass and HOPG electrode proceeded quite rapidly. Furthermore, surface deposition of TiO2 and surface oxidation on HOPG electrodes were performed using the atomic layer deposition (ALD) method. Interfacial lithium-ion transfer between 75Li2S-25P2S5 glass and ALD-modified-HOPG electrodes was also investigated. The activation energies of the interfacial lithium-ion transfer were slightly higher than that of HOPG, but the resistance of the charge-transfer process was lower, indicating that the affinity of the HOPG electrode for the glass electrolyte was improved by surface modification.

Funding

Advanced Low Carbon Technology Research and Development Program

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Corresponding author email address

myzkohei@elech.kuic.kyoto-u.ac.jp

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© 2022 The Author(s)