Patent ID: 7309546
Filing Date: 2007-12-18
Classification: H01M,Y02E

Abstract:
1. A positive active material for a rechargeable lithium battery comprising: a lithiated intercalation compound comprising at least one bare compound represented by the following formulas (1) to (12): where 0.9≦×1.1; 0≦y≦0.5; 0≦z≦0.5; 0≦α≦2; M is selected from the group consisting of Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, and rare earth elements; A is selected from the group consisting of O, F, S, and P; and X is F, S, or P; and an additive compound comprising one or more compounds represented by the formula M′Mn wherein the bare compound is coated with a metal oxide shell and the additive compound has a charging voltage of 4.0 to 4.6V when 5-50% of the M′ is released during charging, and wherein the mixing weight ratio of the lithiated intercalation compound and the additive compound ranges from 99.99 to 70: 0.01 to 30.