Patent ID: 7718317

Claim:
A battery, comprising: a first electrode comprising a compound represented by the general nominal formula: [A a ,D d ]M m PO 4 , wherein: (i) A is Li, and 0<a≦2; (ii) D is Nb, and 0<d≦1; (iii) M is Fe and is partially substituted by D by aliovalent or isocharge substitution, the elements selected for D for the substitution of A and M are the same or different from one another, M = [ M m - u V M , D v V D ] , V M is the oxidation state of M and V D is the oxidation state of D, v>0, u>0, and 1≦m≦3; (iv) wherein A, D, M, a, d, m, u and v are selected so as to maintain electroneutrality of the compound; the battery further comprising a second counter-electrode comprising an intercalation active material; selected from the group consisting of a transition metal oxide, a metal chalcogenide, carbon and mixtures thereof and an electrolyte.