Realization of high performance oxide based all solid state battery by interfacial potential control

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01625
• 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: Okayama University
• Principal Investigator: Teranishi Takashi 岡山大学, 環境生命自然科学学域, 准教授 (90598690)
• Co-Investigator(Kenkyū-buntansha): 中山 将伸 名古屋工業大学, 工学(系)研究科(研究院), 教授 (10401530) ; 三村 憲一 国立研究開発法人産業技術総合研究所, 材料・化学領域, 主任研究員 (20709555) ; 近藤 真矢 岡山大学, 環境生命自然科学学域, 助教 (20890205) ; 岸本 昭 岡山大学, 環境生命自然科学学域, 教授 (30211874)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: リチウムイオン電池 / 全固体電池 / 界面制御層 / 急速充放電 / 界面電荷移動抵抗

Outline of Final Research Achievements

The insulating interfacial layer was incorporated into the electrode-electrolyte interface toimprove the power density of the oxide based all solid state battery. The solid electrolyte substrate supported cell was employed. First, we succeeded to develop the all solid state cell, driving at room temperature. The BaTiO3 nano particle was then utilized as the interfacial layer. The notable enhancement in the cell performance was not confirmed by incorporating the BaTiO3 layer. In all solid state battery, positively charged Li is more favorite to adsorbed onto the negatively charged electrode surface rather than to the insulator surface, since the Li migrates as a single cation. Hereafter, interface layer materials having a high negative charge density will be utilized to further enhance the electrochemical performance of the all solid state cell.

Free Research Field

電子セラミックス

Academic Significance and Societal Importance of the Research Achievements

酸化物系全固体電池(酸化物系電池)の最大のアドバンテージは，大気開放中での電池作製と電池動作が可能となる点である．これが実現すれば，二次電池産業を革新すると言ってよい．しかし，言い換えれば，酸化物界面は大気中において不活性であり，本来，その中をLiが高速伝導することは難しいといえる．つまり，本研究が提案する界面制御層を介した電荷移動機構は，このジレンマを解消しうる新しい原理であると考える．