Research Project
Grant-in-Aid for Research Activity Start-up
Transport properties in high quality cathode active materials for Lithium-Ion-Battery were investigated. Prof. Teshima’s lab. has developed unique flux-crystal growth method and has successively synthesized millimeter size single flaky crystal of LiCoO2 (hereafter LCO). XRD studies revealed that perpendicular axis of the flaky LCO crystal is c-axis as expected. Electron transports along c-axis were measured at several temperatures from 1 Hz to 5 MHz with ion blocking terminals. The electron blocking terminal structure was also designed for lithium ion transport measurements. The higher temperature measurement is desired because the resistivity decreases as the temperature increases and activation energy for ion conduction can be estimated. Li-Al alloy was chosen instead of Li metal as the electrode to extend the measurement temperature range. Fabricated symmetry cell was Li-Al/solid electrolyte/LCO/solid electrolyte /Li-Al and ion conduction was measured up to 523 K.
