| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymer electrolyte cell without deterioration of battery characteristics despite the repetition of charge and discharge, without isolated electrolyte liquid inside the cell, and with excellent safety. SOLUTION: A binder polymer included in a binding agent layer of positive and a negative electrodes is made by blending the first polymer with a swelling rate of 5 weight % or less of electrolyte liquid absorption, and the second polymer with a swelling rate of 30% or more of electrolyte liquid absorption. Only the second polymer is made to be in a state of electrolyte absorbing gel, and the first polymer is made so as to keep a polymer network. The polymer network can restrain the lowering of cell capacity due to the deterioration of electric joining caused by the repetition of charge and discharge, because the polymer network keeps good adhesive property between binding agent layers, or between the binding agent layer and the current collector. As the polymer with high swelling rate is applied as the gel polymer, a good electrolyte liquid holding power is exercised, and generation of isolated electrolyte liquid inside the cell is prevented. |
