Patent ID: RE43276

Claim:
A positive active material for a rechargeable lithium battery comprising: a plurality of active material particles, each particle of the active material particles comprising at least one compound selected from the group consisting of compounds of the formulas 1 to 4 1 and 2 ; Li x Ni 1−y Mn y F 2 (1) Li x Ni 1−y Mn y S 2 (2) Li x Ni 1−y−z Mn y M z O 2−a F a (3) Li x Ni 1−y−z Mn y M z O 2−a S a (4) where M is selected from the group consisting of Co, Mg, Fe, Sr, Ti, B, Si, Ga, Al, 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, and 0.95≦x≦1.1, and 0<y≦0.99 , 0≦z≦0.5, and 0≦a≦0.5 ; and a metal oxide or composite metal oxide layer generally-spherically coating each of the active material particles.