Patent ID: 6723472
Filing Date: 2004-04-20
Classification: H01M,Y02E

Abstract:
A lithium secondary battery comprising:a positive electrode containing as an active material a lithium-containing composite transition metal oxide or a lithium-containing composite transition metal oxide in which a metal element other than the transition metal constituting the lithium-containing composite transition metal oxide is contained in the form of solid solution, said positive electrode further comprising one or more of metals of Groups IIA, IIIB, IVB, VB and VIB and lanthanide elements in the periodic table and compounds of these metals; a negative electrode; and a non-aqueous electrolyte containing a solvent and an electrolyte salt containing at least one salt selected from the group of fluorine-containing inorganic anion lithium salts comprising LiPF6, LiBF4, LiAsF6 and LiSbF6 and at least one salt selected from lithium imide salts represented by the following formula (1): (wherein R1 and R2 are independent of one another and represent CnX2n+1 or CnX2nâˆ’1 in which n is an integer of 1 to 8 and X is a hydrogen atom or a halogen atom) and the one or more metals and compounds thereof is not less than 10 ppm and not more than 500 ppm based on the active material.