| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery, capable of suppressing crack progression and electrode breakage caused by charging and discharging even when a sintered body whose porosity is less than 15% as a positive electrode or a negative electrode is used, having large battery capacitance, excellent in cycle characteristics, and having high reliability.SOLUTION: An electrode plate 1, in which a groove 3 is provided on a principal plane of at least one of sintered bodies 2 whose porosity is less than 15%, is used, thus making it possible to suppress electrode breakage caused by progression of a crack generated from a periphery during charging and discharging and deterioration of capacitance after a cycle of charging and discharging. |
