| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery having a high output, by elucidating the condition of a separator with electrodes and the separator composed as a group. SOLUTION: A distance [cm] between a positive electrode and a negative electrode is expressed as L, the reference weight [g/m2] of a separator is expressed as (u), and the true density [g/cm3] of the separator is expressed as (d). Porosity percentage of the separator in the secondary battery P=(L-u/ d)/L×100 is calculated, and porosity in a range of 15%-45% is regarded as the most suitable value to make the secondary battery have a high output.
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