| 摘要 |
PROBLEM TO BE SOLVED: To enhance safety by maintaining battery performance, realize high capacity by improving a utilization factor of an active material, and reduce a cost by omitting a safety securing element, by providing porous high polymer electrolyte in an electrode, and holding electrolyte having the volume of a specific rate by a positive electrode, a negative electrode or a separator. SOLUTION: Since porous high polymer electrolyte swelling by or wet with electrolyte is provided in a hole or on a surface of an electrode, even electrolyte having the volume of 30 to 95% of the hole volume of the electrode and a separator uniformly spreads over the whole electrode. Ions diffuse at high speed in free electrolyte held in a hole of a porous high polymer together with gas, and even if the electrolyte is gasified by heating or the like, a local pressure- increase is restrained by the gas in the vicinity of the electrode, and restriction of utilization of an active material is relieved. It is desirable to use at least one among copolymers containing a polyvinylidene fluoride, polyacrylonitrile, polyvinyl chloride and a monomer to constitute these in a structure as the porous high polymer. |
