Patent ID: 7682748

Claim:
A nonaqueous electrolyte secondary battery comprising; a positive electrode containing a positive electrode active material; a negative electrode containing a negative electrode active material; and a nonaqueous electrolyte, wherein: (1) lithium cobaltate is used as the positive electrode active material and a mixture containing molybdenum dioxide and lithium titanate in a weight ratio (molybdenum dioxide:lithium titanate) of 90:10 to 50:50 is used as the negative electrode active material; (2) when weight of lithium cobaltate used as the positive electrode active material is denoted by W LCO , weight of molybdenum dioxide used as the negative electrode active material by W MoO2 , and weight of lithium titanate used as the negative electrode active material by W LTO , 100≦(175×W LTO +210×W MoO2 )/W LCO ≦165 is satisfied; and (3) the nonaqueous electrolyte comprises a solvent and 5-30% by volume of ethylene carbonate is contained in the solvent.