not limited to the solvent used above and it is possible to use a solvent in which a solution with a comparatively high relative permittivity such as propylene carbonate vinylene carbonate and u03b3 butyrolactone and a solvent with a low viscosity and low boiling point such as dimethyl carbonate methyl ethyl carbonate tetrahydrofuran 1 2 dimethoxyethane 1 3 dioxolane 2 methoxytetrahydrofuran and diethyl ether are mixed at a suitable ratio for the electrolyte for the electrolyte solution in addition to lipf 6 used above liasf 6 liclo 4 libf 4 licf 3 so 3 or the like can be used further it is possible to use a polymer electrolyte a gel electrolyte in which a polymer electrolyte is impregnated with a nonaqueous electrolyte solution or a solid electrolyte in example 1 a cell which was prepared in the same manner as described in the foregoing embodiment was used the cell thus prepared is hereinafter referred to as a cell a 1 of the present invention cells were prepared in the same manner as described in the foregoing example 1 except that the halogen fluorine content in the total amount of positive electrode active material was made to be 0 0005 mass 0 0007 mass 0 001 mass 1 mass 5 mass and 7 mass respectively the cells thus prepared are hereinafter referred to as.