Patent ID: 7122278

Claim:
A non-aqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode containing a negative electrode mix containing a material capable of absorbing and releasing lithium, wherein the material comprises at least one selected from the group consisting of alloys, intermetallic compounds, carbonaceous materials, organic compounds, inorganic compounds, metal complexes and organic high molecular compounds; and a non-aqueous electrolyte, wherein: the positive electrode contains a lithium manganese composite oxide, which contains lithium when synthesizing the oxide, as an active material and the negative electrode contains at least one compound selected from the group consisting of NaOH, NaNH 2 , NaN 3 , NaHC 2 , KOH, KN 3 , KNH 2 , KHC 2 , and Sr(OH) 2 , and the content of said at least one compound in the negative electrode mix is such that the total content of the elements of sodium, potassium and strontium is not less than 0.01% by weight and not more than 10% by weight based on the negative electrode mix.