The secondary battery has non-aqueous electrolyte

A secondary battery The nonaqueous electrolyte comprises a positive electrode (1), a negative electrode (2), a separator (3) interposed between the two electrodes and a nonaqueous electrolyte, wherein an active material of positive electrode is a mixture of a composite oxide of spinel structure lithium-manganese represented by the general formula Li1 + zMn2O4, where the relation 0 ≤ z ≤ 0.2 is satisfied, and a composite oxide of lithium transition-metal compound represented by the general formula LiNi1- x-yCoxMnyO2 where the relationship 0.5 polyvinylidene fluoride; and a proportion of the binding agent on the basis of said active material of positive electrode is in a range of 2% by weight to 10% by weight.