▎ 摘　　要

Dual carbon batteries have recently attracted significant attention because of their ecofriendliness and reliability. In this study, graphene-like graphite (GLG) was prepared by thermal reduction of graphite oxide to be used as a cathode material, and the electrochemical PF6- anion-intercalation reaction into GLG was investigated. Decreasing the heat-treatment temperature of GLGs from 900 degrees C to 600 degrees C resulted in increasing the reversible capacities and interlayer distances of GLG samples. Among them, GLG synthesized at 700 degrees C (GLG700) showed the largest discharge capacity of 137 mAh g(-1), which was much larger than that of graphite (52 mAh g(-1)). Variations in the X-ray diffraction patterns and Raman spectra of GLG700 indicated that the stage number reached 1 at 4.8 V (vs Li+/Li) while that of graphite was 2 at the same potential. This indicates that GLG could store PF6- anion in every interlayer, which is probably one of the main causes of the larger capacity. The charge-discharge cycling test of GLG700 showed that the capacity gradually increased during cycling, and the coulombic efficiency was approximately 97% at every cycle after the 5th cycle. These results clearly demonstrate that GLG can be used as a cathode material with a large capacity for dual carbon batteries.