| 摘要 |
PROBLEM TO BE SOLVED: To improve the volume efficiency, and to improve the charging and discharging cycle characteristic by regulating thickness and carbon content density of an active material layer of a negative electrode. SOLUTION: In this battery, an active material layer of a negative electrode 4 is formed as 30μm or less of thickness and at 1.5g/cm<3> of carbon content density. With this regulation, a negative electrode made of the active material, in which get-in/out of Li ion is possible over the whole area in the thickness direction in spite of high carbon content density, can be obtained. A compact battery at a high capacity having high volume efficiency and excellent charging and discharging cycle characteristic can be obtained. As the active material, carbon material is used, and at least one kind of natural graphite, cokes, meso- carbon micro beads and synthetic resin carbon is desirably used. |
