| 摘要 |
PROBLEM TO BE SOLVED: To enhance the charge and discharge cycle characteristic of a lithium secondary battery by reducing the time for injecting an electrolytic solution. SOLUTION: A recess part is formed in the surface of a positive electrode plate 1 making contact with a separator 5, and the wettability of the surface of the positive electrode plate and an electrolytic solution, the impregnation property of the electrolytic solution in a group of electrode plates, and a liquid- retaining property between the positive ?electrode plate and the separator are improved by setting the area of the recess part at 150 to 10,000 times the average area of each one pore in the separator 5, keeping the depth of the recess part in a range corresponding to 1 to 25% of the thickness of the active material mix layer of the positive electrode plate 1, and keeping the total area of the recess part within a range corresponding to 3 to 80% of the surface area of the active material mix layer. |
