Patent ID: 8318352

Claim:
A battery, comprising: (a) a first electrode comprising an active material of the formula: Li a Co e Fe f M 1 g M 2 h M 3 i XY 4 , wherein: (i) 0<a≦2, e>0, and f>0; (ii) MI is one or more transition metals, where g≧0; (iii) M2 is one or more +2 oxidation state non-transition metals, where h is greater than ≧0; (iv) M3 is one or more +3 oxidation state non-transition metals, where 0.01≦i≦0.2; and (v) XY 4 is selected from the group consisting of X′O 4-x Y′ x , X′O 4-y Y′ 2y , X″S 4 and mixtures thereof, where X′ is selected from the group consisting of P, As, Sb, Si, Ge, V, S, and mixtures thereof; X″ is selected from the group consisting of P, As, Sb, Si, Ge, V and mixtures thereof; Y′ is selected from the group consisting of halogen, S, N, and mixtures thereof; 0≦x≦3; and 0<y≦2; and (vi) wherein (e+f+g+h+i)<2, and M 1 , M 2 , M 3 , XY 4 , a, e, f, g, h, x, and y are selected so as to maintain electroneutrality of the active material; and (b) a second electrode which is a counter-electrode to the first electrode; and (c) an electrolyte comprising an electrolyte salt, a cyclic ester and a carbonate selected from the group consisting of alkyl carbonates, alkylene carbonates, and mixtures thereof.