OPERANDO MEASUREMENT OF LAMINATED LITHIUM ION BATTERY USING 2D DETECTOR

Fig. 1 shows a photo of the laminate cell attachment and the 2D detector. LiFePO4 was selected as the positive electrode. Measurement using an exposure time of 10 sec was repeated while charging/discharging the laminate cell at 2C/1C (Here, 1C denotes the current based on ampere-hour rating for total charge/discharge in 1 hour, e.g. the charge at 2C completes in 0.5 hours and discharge at 0.5C does in 2 hours. ) Fig. 2 shows a 2D diffraction image observed during the charging process. Diffraction signals characteristic to FePO4 and LiFePO4 were observed in the region indicated by the dotted line. Fig. 3 shows the profile map of the region marked in Fig. 2, the voltage graph and the diffraction peak intensities of FePO4 and LiFePO4. It was confirmed that the electrode material returned to the same crystal phase as before the measurement started.