Patent ID: 6399251
Filing Date: 2002-06-04
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
A lithium secondary battery comprising:a negative electrode, a non-aqueous electrolyte, and a positive electrode, wherein an active material of said negative electrode comprises amorphous carbon, negative electrode density of which is larger than 0.95 g/cm3, and smaller than 1.5 g/cm3, an active material of said positive electrode comprises a complex oxide material including Li and Mn, which has a spinel type crystalline structure, and a half value width of 2 &thgr; angle of peak (400) in X-ray diffraction pattern smaller than 0.20Â°, the Li/Mn atomic ratio of said complex oxide is larger than 0.55, and smaller than 0.80, the lattice constant of the spinel crystalline structure of said complex oxide is larger than 8.031 Ã¥ and smaller than 8.230 Ã¥, the specific surface area of secondary particles of said complex oxide is larger than 0.10 m2/g and smaller than 1.5 m2/g, and the average particle diameter of primary particles of said complex oxide is larger than 1 &mgr;m and smaller than 20 &mgr;m.