Patent ID: 8012630

Claim:
A polymer gel electrolyte secondary cell comprising: a positive electrode; a negative electrode; a polymer gel electrolyte containing a non-aqueous solvent, a polymer, and a lithium salt; and a cell case for accommodating the positive electrode, the negative electrode, and the polymer gel electrolyte, wherein: the non-aqueous solvent contains at least one of ethylene carbonate and propylene carbonate, the volume ratio (25° C., 1 atm) of the ethylene carbonate and the propylene carbonate combined to the non-aqueous solvent being equal to or more than 60%; the polymer comprises a copolymer having a monomer containing N,N-dimethyl acrylamide and a compound with three or more acrylate groups and/or methacrylate groups, the ratio of the compound to the total mass of the monomer being from 10 to 30 mass %; and the ratio of the polymer to the polymer gel electrolyte including the polymer is from 1.0 to 2.0 mass %.