Patent ID: 7422823

Claim:
An electrode active material, represented by the general formula LiM(PO 4-x Y′ x ) wherein M is Co e M 1 g M 2 h M 3 i M 4 j , and (a) M 1 is one or more transition metals, comprising Fe; (b) M 2 is one or more +2 oxidation state non-transition metals; (c) M 3 is one or more +3 oxidation state non-transition elements; (d) M 4 is one or more +1 oxidation state non-transition metals; and (e) Y′ is selected from the group consisting of a halogen, S, N, and mixtures thereof; and each of e, g, h and i>0; j≧0; (e+g+h+i+j)≦1; 0≦x≦0.5 and wherein 0<x≦0.1.