In a non-aqueous electrolyte secondary battery provided with a positive electrode, a negative electrode using carbon material as negative electrode active material, and a non-aqueous electrolyte solution, the non-aqueous electrolyte solution contains at least a saturated cyclic carbonic ester and a cyclic carbonic ester having C.dbd.C double bond where an amount of the cyclic carbonic ester having C.dbd.C double bond is in a range of 1.0.times.10.sup.-8 to 13.0.times.10.sup.-5 g per negative electrode capacity of 1 mAh.

 
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> Methods of making transition metal compounds useful as cathode active materials

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