was replaced with a mixed solvent consisting of ec 60 vol and dmc 40 vol a nonaqueous electrolyte was used which was prepared in the same manner as in example 19 except that the mixed solvent was replaced with a mixed solvent consisting of ec 80 vol and dmc 20 vol a nonaqueous secondary cell was fabricated by using a nonaqueous electrolyte prepared by adding vinyl ethylene carbonate vec 0 01 wt and vinylene carbonate vc 0 01 wt as additives to a mixed solvent consisting of ethylene carbonate ec 30vol and dimethyl carbonate dmc 70vol and further dissolving lipf 6 as an electrolyte salt in a ratio of 1 mol l a nonaqueous electrolyte was used which was prepared in the same manner as in example 26 except that the additives were replaced with vec 0 5 wt and vc 0 5 wt a nonaqueous electrolyte was used which was prepared in the same manner as in example 26 except that the additives were replaced with vec 0 01 wt and vc 5 wt a nonaqueous electrolyte was used which was prepared in the same manner as in example 26 except that the additives were replaced with vec 2 wt and vc 0 01 wt a nonaqueous electrolyte was used which was prepared in the same manner as in example 26 except that the additives were replaced with vec 2 wt and vc 5 wt a nonaqueous electrolyte was used which was prepared in the same.