Lithium distribution analysis in all-solid-state lithium battery using microbeam particle-induced X-ray emission and particle-induced gamma-ray emission techniques

• Published in: International journal of PIXE Vol. 27; no. 1n02; pp. 11 - 20
• Main Authors: Yoshino, K., Suzuki, K., Yamada, Y., Satoh, T., Finsterbusch, M., Fujita, K., Kamiya, T., Yamazaki, A., Mima, K., Hirayama, M., Kanno, R.
• Format: Journal Article
• Language: English
• Published: Singapore World Scientific Publishing Company 2017; World Scientific Publishing Co. Pte., Ltd
• Subjects: Electrolytes; Gamma rays; Lithium; PIGE; all-solid-state lithium battery; PIXE; lithium distribution
• ISSN: 0129-0835; 1793-6616
• DOI: 10.1142/S012908351850002X

For confirming the feasibility of micrometer scale analysis of lithium distribution in the all-solid-state lithium battery using a sulfide-based solid electrolyte, the cross-section of pellet type battery was analyzed by microbeam particle-induced X-ray emission (PIXE) and particle-induced gamma-ray emission (PIGE) measurements. A three-layered pellet-type battery (cathode: LiNbO3-coated LiCoO 2 + Li 1 0 GeP 2 S 1 2 /solid electrolyte: Li 1 0 GeP 2 S 1 2 /anode: TiS 2 + Li 1 0 GeP 2 S 1 2 ) was prepared for the measurements. Via elemental mapping of the cross-section of the prepared battery, the difference in the yields of gamma rays from the 7 Li ( p , p ′ γ ) 7 Li inelastic scattering (i.e., the lithium concentrations) between the composite electrodes and the solid electrolyte layer was clarified. The difference in the number of lithium ions at the composite anode/solid electrolyte interface of ( Δ n = 0 . 2 6 × 1 0 − 4 mol) in the battery can be clearly detected by the microbeam PIGE technique. Therefore, lithium distribution analysis with a micrometer-scale spatial resolution is demonstrated. Further analysis of the cathode/anode composite electrodes with the different states of charge could provide important information to design a composite for high-performance all-solid-state lithium batteries.