The electrical property and its mechanism of intercalation compounds of CuCl₂

The electrical property of 1 - 4 stages of intercalation compounds of CuCl₂, which were synthesized with 2 - 3 μm graphite powder, was measured by the four-probe method. Their conductivity was 1.5 - 2.2 times as that of their host material, graphite. The higher the stage, the higher the conductivity. The microanalysis of chemical compounds by the X-ray energy spectrum scanning analysis of TEM testified that the atom ratio of chlorine and cupric was non-stoichoimetric. The vacancy of the chlorine anion in the GICs increased the concentration of the carrier particle. They link up in c-axis, and enlarged the activity space of the carrier particle. The exchange of the electrovalence of the cupric ion has been testified by XPS-ESCA. Graphite and chloride in the stage structure, seem to be the conductor and insulator, which form the "sandwich" structure. This special structure produced a weak chemical bond belt and provided the carrier space in the perpendicular direction to the c-axis. These factors in and vertical to the direction of c-axis together increased the electrical properties.