Abstract
The reflection measurements of superionic conductors LiCoO 2 and Li 1- x CoO 2, which are already in use for the positive electrode material of 4 V rechargeable lithium batteries, have been performed in the millimeter wave region from 6 to 60 cm −1 using the electron storage ring facilities of Institute of Molecular Science in Okazaki. The increase of the reflectivity has been observed in the low wavenumber region below 10 cm -1 above 300 K in Li 1- x CoO 2 for the first time, while the reflectivity of LiCoO 2 has almost the constant value in all observed temperature region between 77 to 380 K. The results will be discussed in connection with our previous results of LiNiO 2.
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