Patent ID: 7172836

Claim:
A nonaqueous electrolyte battery comprising: (a) a cathode comprising a positive active material, said positive active material comprising a spinel type lithium manganese oxide of formula LiMn 2 O 4 or LiMn 2âˆ’xâˆ’y M y O 4 wherein: (i) xâ‰§0.9; (ii) 0.01â‰¦yâ‰¦0.5, and (iii) M is one or more elements selected from the group consisting of Fe, Co, Ni, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca and Sr; (b) an anode including a negative active material capable of being doped with or dedoped of lithium; and (c) a nonaqueous electrolyte provided between the cathode and the anode, wherein: a ratio X ( Ac - Ad ) Ã— Aw Cc Ã— Cw Ã— 100 = X FORMULA â¢ â¢ 1 is such that 20â‰¦Xâ‰¦50, with the first charging capacity of the positive active material per gram being Cc [mAh/g], the weight of the positive active material being Cw [g], the first charging capacity of the negative active material per gram being Ac [mAh/g], the first discharging capacity being Ad [mAh/g] and the weight of the negative active material being Aw [g].