Characterization of role of constituent ions in complicated solid electrolytes by combination of element-selective structural analysis methods

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289228
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Tohoku University
• Principal Investigator: Waseda Yoshio 東北大学, 多元物質科学研究所, 名誉教授 (00006058)
• Co-Investigator(Kenkyū-buntansha): 杉山 和正 東北大学, 金属材料研究所, 教授 (40196762) ; 有馬 寛 東北大学, 金属材料研究所, 助教 (60535665) ; 柴田 浩幸 東北大学, 多元物質科学研究所, 教授 (50250824) ; 助永 壮平 東北大学, 多元物質科学研究所, 助教 (20432859) ; 鈴木 茂 東北大学, 多元物質科学研究所, 教授 (40143028) ; 篠田 弘造 東北大学, 多元物質科学研究所, 准教授 (10311549) ; 藤枝 俊 東北大学, 多元物質科学研究所, 助教 (60551893)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 元素選択的構造評価 / X線吸収分光法 / 核磁気共鳴法

Outline of Final Research Achievements

The element-selective structural analysis methods were used to characterize the local structures in several phosphate compounds with the NASICON-type structure. They are promising materials for lithium ion batteries, as they reveal superior charge-discharge characteristics. The chemical state in Li2NaV2（PO4)3 samples of a candidate cathode during the charge-discharge was analyzed by using X-ray absorption spectroscopy. X-ray anomalous scattering was used to analyze the middle-range order structure in NASICON-type glass-ceramics, which are utilized as electrolytes in solid state batteries. Influences of foreign elements on the local structure around aluminum and phosphorus in these samples were also analyzed by NMR. These results were discussed coupled with their electrochemical properties.

Free Research Field

材料工学