Electrochemical intercalation of Li into B/C/N materials

PRES 41

Yasuto Imai, m05104@mail.osakac.ac.jp, Graduate School of Engineering, Osaka Electro-Communication University, 18-8 Hatsu-Cho, Neyagawa, 572-8530, Japan and Masayuki Kawaguchi, kawaguti@isc.osakac.ac.jp, Department of Applied Chemistry, Osaka Electro-Communication University, 18-8 Hatsu-Cho, Neyagawa, 572-8530, Japan.
The materials of composition BC6N and BC2N were prepared at 1370~2070K by CVD method using nitrile and boron trichloride. The materials showed the graphite-like layered structure. Electrochemical intercalation of Li into the materials were studied in 1M-LiPF6/EC+DEC (50vol.%) solution by using 3 electrode cell. Cyclic voltammogram (CV) of the BC6N prepared at 2070K showed 3 reduction peaks (1.3V, 0.7V, 0.0V vs. Li/Li+) on first cycle. On the other hand, the BC2N prepared at 2070K showed a CV having reduction peaks (1.5V, 0.7V, 0.0V vs. Li/Li+) on first cycle. The reduction peak at higher potential for BC2N (1.5V) than that for BC6N (1.3V) could be explained by the electronic states of the materials.