| 摘要 |
PROBLEM TO BE SOLVED: To improve cycle characteristic in a negative electrode of mesophase spheroidal graphite. SOLUTION: As a graphite material, 0.1 to 7.5 wt.% of minute graphite spheroidal graphite of 0.1 to 3 μm particle size is included with respect to the whole. Thereby, the minute spheroidal graphite is bridgingly filled into gaps among the mesophase spheroidal graphite having an average graphite diameter, and contact points among the spheroidal graphite are greatly increased, so that cycle characteristics are enhanced which allows no deterioration in the contact state thereamong, even if the spheroidal graphite repeats expansion and contraction with charging and discharging. |
