In-plane ordering of Li species in the interlayer of the turbostratic carbon as negative electrode for a high-power and long-life Li ion battery

The fundamental electrochemical performances of a new carbon called “ICOKE” which was prepared by the graphitization of coke at ca. 2000 °C were recently reported. It showed the excellent pulse charge/discharge characteristics and long cycle performance. In the present study, the in-plane structure of Li-intercalated ICOKE was investigated in detail by means of cyclic voltammetry, X-ray diffraction profile change and the Li-NMR spectra. As a result, it was found that the ionic state of Li species in the interlayer and the in-plane structure of Li-intercalated ICOKE were different from those of natural graphite.