Polymer gel electrolyte secondary cell

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 %.