ABSTRACT
Figure 40 shows the variation of the c spacing Bragg peak of BQN before and after charge-discharge cycles. The charge-discharge current density was 40 mA/g BQN, and cutoff potentials were 0 and 3.0 V. Although the height of peaks decreased after several charge-discharge cycles, somewhat for BC2N(1500°C) and considerably for BC2N(1000°C), the cycling essentially kept the original profiles of the peaks. Furthermore, the peak shifted slightly indic ative of small expansion of the interlayer spacing when BC2N(1500°C) was
Figure 39 Variation in the diffusion coefficient of Li+(Aj+) in Lix(BC2N) at 298 K. o, 1000°C; A, 1500°C; □ , 2000°C. Electrolyte solution, 1 mol dm-3 LiC104/ PC. (From Ref. 45.)
charged to 0 V versus Li/Li+. These results are in accord with reversible Li+ intercalation in BC2N(1000°C) and BC2N(1500°C), being favorable properties for electrode applications.
