LITHIUM SECONDARY BATTERY, ITS NEGATIVE ELECTRODE AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To provide a good cycle characteristic, a high charging/discharging capacity and a quick charging/discharging characteristic by containing a mixture of two or more kinds of graphitic grains having different fine hole volumes based on fine holes with the hole diameter in a specific range in a battery negative electrode. SOLUTION: This negative electrode contains a mixture of two or more kinds of graphitic grains having different fine hole volumes based on fine holes with the hole diameter in the range of 0.01-100 μm, more precisely it contains graphitic grains having the fine hole volume of 0.4 cc/g or above in the range of 0.01-100 μm and graphitic grains having the fine hole volume of 0.08-0.4 cc/g in the range of 0.01-100. Two or more kinds of graphitic grains having different fine hole volumes have the individually measured discharging capacity of 300 mA/g or above respectively, and the difference of the discharging capacity between the graphitic grains is within 10% of the value of the discharging capacity of the graphitic grains having the largest discharging capacity. At least one kind of graphitic grains have a structure collected or coupled with multiple flat grains so that orientation faces are made nonparallel.