SURFACE STRUCTURE AND ELECTROCHEMICAL CHARACTERISTICS OF GRAPHITE FLUORINATED BY ELEMENTAL FLUORINE AND PLASMA TREATMENT USING CF_4

摘要

Surface modification of graphite powder has been performed by elemental fluorine and radiofrequency plasma fluorination. Both of the methods enlarge the surface areas of graphite samples and change their pore volume distribution. Surface-fluorinated graphite samples demonstrate the capacities higher than those of original samples and even the theoretical capacity of graphite, 372 mAhg~(-1) without reducing the first coulombic efficiencies. The increments of the capacities are approx 5, approx 10 and approx 15 percent for graphite samples with average particle diameters of 7, 25 and 40 mu m, respectively.