Design of solid interface for all-solid-state sodium batteries with oxide solid electrolytes

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H01713
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Osaka Prefecture University
• Principal Investigator: Hayashi Akitoshi 大阪府立大学, 工学(系)研究科(研究院), 教授 (10364027)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 固体電解質 / 酸化物電解質 / 硫化物電解質 / 複合電解質 / 全固体ナトリウム電池

Outline of Final Research Achievements

Composite solid electrolytes consisting of NASICON and Na3SbS4 are prepared by ball-milling without high-temperature sintering. The electrolyte with 70 vol.% NASICON shows the conductivity of 2.7×10-4 S cm-1 and it is used for all-solid-state sodium batteries operating at room temperature. The Na2.88Sb0.88W0.12S4 electrolyte exhibits the highest conductivity of 3.2×10-2 S cm-1 and it is synthesized by not only conventional solid-state reaction, but also a liquid-phase process. Na3BO3-based oxide glasses are Na+ ion conductors with good formability.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

化学安定性に優れるNASICON粒子間に成形性に優れるNa3SbS4を介在させることによって、高温焼結なしで導電率と成形性を兼ね備えた電解質複合体が得られており、酸化物を主成分とする固体電解質を用いた全固体ナトリウム電池の室温作動を実証した。安全性、経済性、高エネルギー密度を兼ね備えた全固体ナトリウム電池の実現に寄与する研究成果であり、社会的波及効果は大きいと考えられる。