Ion diffusion in solids clarified with quantum beams and application to electrochemical devices

2017 Fiscal Year Final Research Report

• Project/Area Number: 26286084
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: Toyota Central R&D Lab., Inc.
• Principal Investigator: Sugiyama Jun 株式会社豊田中央研究所, 分析部量子ビーム解析研究室, 主監 (40374087)
• Co-Investigator(Kenkyū-buntansha): 幸田 章宏 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 研究機関講師 (10415044)
• Co-Investigator(Renkei-kenkyūsha): NOZAKI Hiroshi 株式会社豊田中央研究所, 分析部量子ビーム解析研究室, 主任研究員 (90394890) ; HARADA Masashi 株式会社豊田中央研究所, スラリー特任研究室, 主任研究員 (60394839) ; UMEGAKI Izumi 株式会社豊田中央研究所, フロンティア研究部門, 研究員 (20638522) ; SATO Taku 東北大学, 多元物質科学研究所, 教授 (70354214)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: ミュオンスピン回転緩和 / 量子ビーム / イオン拡散 / 電池

Outline of Final Research Achievements

Ion diffusion is solids is a basic principle behind an operation of batteries. However, it is extremely difficult to determine a reliable diffusion coefficient of Li and Na ions in electrode materials, particularly for cathode materials due to the presence of paramagnetic moments. We have therefore attempted to measure a diffusion coefficient in such materials with a muon spin rotation and relaxation (muSR) technique, because muSR can detect a slight deviation of internal magnetic fields in solids caused by Li (Na) diffusion. As a result, we have successfully obtained diffusion coefficients of Li and Na ions in electrode and electrolyte materials using powder, electrode sheet, and film samples.

Free Research Field

ミュオン固体物性