| abstract |
A non-aqueous secondary battery having an electrodengroup and a non-aqueous electrolytic solution,ncharacterized in that :(1) the electrode group is containednin a casing made of a sheet having a resin layer with anthickness of 0.5 mm or less, (2) the non-aqueous solventncontains γ-butyrolactone, ethylene carbonate, at least onenvinylene carbonate compound and at least one vinylethylenencarbonate compound, (3) the amounts of the vinylenencarbonate compound, the vinylethylene carbonate compoundnand sum total of both are, respectively, 0.01 to 5 % bynweight, 0.01 to 5 % by weight and 0.02 to 6 % by weight,nbased on the total weight of the non-aqueous solvent, andn(4) the amounts of the γ-butyrolactone and the ethylenencarbonate are, respectively, 50 % by volume or more and 10n% by volume or more, based on the total volume of the non-aqueousnsolvent. |