Patent ID: 6509120
Filing Date: 2003-01-21
Classification: H01M,Y02E

Abstract:
A lithium battery comprising a positive electrode comprising a positive electrode active material of a boron-containing lithium-manganese complex oxide, a negative electrode, and a nonaqueous electrolyte containing a solute and a solvent,wherein said positive-electrode active material is a boron-containing lithium-manganese complex oxide having an atomic ratio (B/Mn) of boron B to manganese Mn in the range of 0.01-0.20 and a predischarge mean manganese valence of not less than 3.80, wherein said solute in the nonaqueous electrolyte includes at least one substance selected from lithium trifluoromethanesulfonimide, lithium pentafluoroethanesulfonimide and lithium trifluoromethanesulfonmethide, wherein said solvent in the nonaqueous electrolyte is a solvent mixture containing at least one organic solvent selected from the group consisting of ethylene carbonate, propylene carbonate, vinylene carbonate, &ggr;-butyrolactone and sulfolane, and at least one organic solvent selected from the group consisting of 1,2-dimethoxyethane, 1,2-diethoxyethane, 1,2-ethoxymethoxyethane, tetrahydrofuran, dioxolan, dimethylcarbonate, diethyl carbonate and ethylmethyl carbonate, wherein said solvent in the nonaqueous electrolyte does not contain butylene carbonate.