Secondary Electrochemical Cell

A battery, comprising:

• a spirally coiled electrode assembly and an electrolyte enclosed in a cylindrical casing, the spirally coiled electrode assembly comprising:
• a positive electrode comprising a compound represented by the general nominal formula:
• AaMm(XY4)3Ze,
• wherein:
• (i) A is selected from the group consisting of elements from Group 1 of the Periodic Table, and mixtures thereof, and 0<a 9;
• (ii) M includes at least one redox active element, and 1≦m≦3;
• (iii) XY4 is selected from the group consisting of X′[O4-x, Y′x], X′[O4-y, Y′2y], X″S4, [XZ′″,X′1-Z]O4, and mixtures thereof, wherein:
• (a) X′ and X′″ are each independently selected from the group consisting of P, As, Sb, Si, Ge, V, S, and mixtures thereof;
• (b) X″ is selected from the group consisting of P, As, Sb, Si, Ge, V, and mixtures thereof;
• (c) Y′ is selected from the group consisting of a halogen, S, N, and mixtures thereof;
• and
• (d) 0≦x≦3, 0≦y≦2, and 0≦z≦1;
• and
• (iv) Z is selected from the group consisting of a hydroxyl (OH), a halogen selected from Group 17 of the Periodic Table, and mixtures thereof, and 0≦e≦4;
• wherein A, M, X, Y, Z, a, m, x, y, z, and e are selected so as to maintain electroneutrality of the compound;
• the spirally coiled electrode assembly further comprising a negative electrode comprising an intercalation active material;
• an electrolyte in ion-transfer communication with the positive electrode and the negative electrode, the electrolyte comprising a solvent comprising a mixture of a cyclic carbonate and a non-cyclic carbonate;
• and
• a separator interposed between the negative electrode and the positive electrode.