Patent ID: RE42433

Claim:
A positive active material for a rechargeable lithium battery comprising: at least one compound selected from the group consisting of lithiated compounds represented by formulas 1 to 9; Li x Mn 1-y M′ y A 2 (1) Li x Mn 1-y M′ y O 2-z A z (2) Li x Mn 2 O 4-z A z (3) Li x Mn 2-y M′ y A 4 (4) Li x B 1-y M″ y A 2 (5) Li x BO 2-z A z (6) Li x Ni 1-y-z Co y O 2-z A z (7) Li x Ni 1-y-z Co y M″ z A 2α (8) Li x Ni 1-y-z Mn y M′ z A α (9) where 0.95≦x≦1.1, 0≦y≦0.5, 0≦z≦0.5; 0≦α≦2; M′ is at least one element selected from the group consisting of Al, Cr, Co, Ni, Fe, Mg, Sr, V, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf. Cf, Es, Fm, Md, No and Lr; M″ is at least one element selected from the group consisting of Al, Cr, Mn, Fe, Mg, Sr, V, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No and Lr; A is selected from the group consisting of O, F, S and P; and B is selected from the group consisting of Ni and Co; a metal oxide layer formed on a surface of the compound; and a plurality of metal oxide masses adhered on the metal oxide layer.