| abstract |
The present invention implements an entire shaft which is hard to lower the charge-discharge capacity even if it is bent or spread repeatedly. The content of the binder relative to the total amount of the active material layer including the active material is preferably 1 wt% or more and 10 wt% or less, preferably 2 wt% or more and 8 wt% or less, more preferably 3 wt% or more and 5 wt% or less do. |