Imaging of Li distribution in Li ion batteries by direct elemental detection technique of PIGE and NRA combined with proton microbeam at TIARA

Yamazaki, Akiyoshi*; Kamiya, Tomihiro; Sato, Takahiro; Mima, Kunioki*; Fujita, Kazuhisa*; Okuda, Chikaaki*; Sawada, Hiroshi*; Saito, Tsohiya*; Gonzales, R.*; Perlado, J. M.*; Kato, Yoshiaki* 

For the development of advanced lithium (Li) ion batteries, precise diagnostics of Li in the electrode material is required. In order to obtain specific distribution of Li in Li ion battery materials, we have utilised the nuclear reaction analysis (NRA) and the particle induced -ray emission analysis (PIGE) with the micro-PIXE analysis, which characterises the heavier elements, in the proton microbeam system at TIARA. The Li distribution in real Li-ion batteries was analysed mainly in the cross-sections of fabricated electrode samples containing micro particles based on metal oxides. The objects of the analyses were extended to all-solid batteries as the candidate for the next generation Li ion battery. The obtained images show the distributions of the Li ions buried in the electrode materials varying with charging condition and other various factors. This paper describes the analysis system and results of the experiments.