A reversible oxygen redox reaction in bulk-type all-solid-state batteries

Kenji Nagao; Yuka Nagata; Atsushi Sakuda; Akitoshi Hayashi; Minako Deguchi; Chie Hotehama; Hirofumi Tsukasaki; Shigeo Mori; Yuki Orikasa; Kentaro Yamamoto; Yoshiharu Uchimoto; Masahiro Tatsumisago

doi:10.1126/sciadv.aax7236

A reversible oxygen redox reaction in bulk-type all-solid-state batteries

Sci Adv. 2020 Jun 19;6(25):eaax7236. doi: 10.1126/sciadv.aax7236. eCollection 2020 Jun.

Authors

Affiliations

¹ Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
² Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
³ Department of Applied Chemistry, College of Life Science, Ritsumeikan University, 1-1-1, Noji-Higashi, Kusatsu, Shiga 525-8577, Japan.
⁴ SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan.
⁵ Graduate School of Human and Environmental Studies, Kyoto University, Nihonmatsu-cho, Yoshida, Sakyo-ku, Kyoto 606-8317, Japan.

Abstract

An all-solid-state lithium battery using inorganic solid electrolytes requires safety assurance and improved energy density, both of which are issues in large-scale applications of lithium-ion batteries. Utilization of high-capacity lithium-excess electrode materials is effective for the further increase in energy density. However, they have never been applied to all-solid-state batteries. Operational difficulty of all-solid-state batteries using them generally lies in the construction of the electrode-electrolyte interface. By the amorphization of Li₂RuO₃ as a lithium-excess model material with Li₂SO₄, here, we have first demonstrated a reversible oxygen redox reaction in all-solid-state batteries. Amorphous nature of the Li₂RuO₃-Li₂SO₄ matrix enables inclusion of active material with high conductivity and ductility for achieving favorable interfaces with charge transfer capabilities, leading to the stable operation of all-solid-state batteries.

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