Partially-crystallized carbon material obtained by the reducing reactions from alkalis carbonate and its electric performance

摘要

We report here a new sort of partially-crystallized carbon materials obtained from the reducing reactions between alkalis carbonate (M_2CO_3 M=Li, K, Na) and active metals such as Li, Mg, Al and Ga. The chemical reactions are carried out at the temperature range of 600-900 ℃ and under the argon ambience. The typical reaction can be represented as follows: K_2CO_3+4Li=2Li_2O+K_2O+C. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and energy-dispersive X-ray fluorescence (EDAX) characterizations reveal evidently that the obtained final black powder products are carbon materials with partially-crystallized structure. In addition, we also investigate the electric performance of the obtained carbon materials; the initial discharge capacity and initial charge capacity have been measured respectively as high as 1267 mAh/g and 736 mAh/g.