The double layered carbon materials were prepared from mesophase pitch, artificial graphite, natural graphite and coke coated with coal-tar pitch. The coal-tar pitch as a coating species was dissolved by organic solvents like toluene and light oil. Th...
The double layered carbon materials were prepared from mesophase pitch, artificial graphite, natural graphite and coke coated with coal-tar pitch. The coal-tar pitch as a coating species was dissolved by organic solvents like toluene and light oil. The coating of coal-tar pitch on the mesophase pitch, artificial graphite, natural graphite and coke was confirmed by increasing of the FWHM (full width at half maximum) of X-ray diffraction and of percentage of hydrogen by CHN analysis. However, the coating layers were not confirmed by SEM. The coated carbonaceous materials were carbonized at 800 to 1000℃ in nitrogen atmosphere, and then graphitized at 2600℃ for using of anode in Li-ion battery.
Performance of double layered carbonaceous materials as the anode were carried out at the coin type cell. Performance of anode was measured by the charge and discharge capacity. The capacities of charge and discharge were changed by thermal treatment and kind of precursors. However, the coating methods showed the little differences in charge capacity. The lower heat-treatment at 800℃ showed the higher capacity rather than at 1000℃. And also, the lower capacity shown the graphitized double layered materials rather than carbonized materials.
Conclusionally, the performances of anode materials were changed by crystallity, composition, microstructures of carbonaceous materials.