2017 年 38 巻 4 号 p. 182-187
The migrations of lithium (Li) as well as hydrogen (H) in both Au and Pt electrodes sides of Au/LiCoO2/Li1+xAlxGeyTi2−x−yP3O12-AlPO4(LATP)/Pt (thickness: approximately 24 nm/65 nm/150 μm/16 nm) multilayers were dynamically investigated with applying various voltages in vacuum using an ion beam surface analysis, combined elastic recoil detection (ERD) with Rutherford backscattering spectrometry (RBS) measurements with 9.0-MeV O4+ ions. The ERD spectra clearly revealed that the Li concentrations at each Au/LiCoO2/LATP and Pt/LATP side decreased and increased, respectively, when the acquired voltages were more than 1.00 V and the Li atoms of approximately 80 at% migrated from the LiCoO2 cathode to the LATP (LixTiy(PO4)3) anode after applying the voltages up to 2.43 V. In addition, the presence of H was also observed at the Au/LiCoO2/LATP and Pt/LATP interfaces and in the LiCoO2 and LATP bulks and might significantly influence on the Li+ ion conduction for the battery materials.
