Structural defects in mechanically ground graphite

摘要

Highly ordered synthetic graphite was nechanically groud in a planetary ball mill. The interlayer spacing d_002 was found to increase in the grinding process with the reduction of the crystalline size L_a, L_c. The specific surfac area increased to over 600 m~2/g at the maximum. The result of Raman spectroscopy shows that the ground graphite yields a smalle value of full width at half maximum (FWHM) of the 1350 cm~(-1) peak than the heat-treated carbon for a given value of L_a. This indicates the difference in the type of structural defects involved between the heat-treated carbon and ground graphite. A further suggestion of this result is that the mechanically groud graphite has more uniform boundary and a less-defective structure of hexagonal graphite lattice within the layer planes than heat-treated carbon.