The present invention relates to novel electrode active materials represented by the general formula AaMb(XY4)cZd, wherein:

    • (a) A is one or more alkali metals, and 0a8;
    • (b) M is at least one metal capable of undergoing oxidation to a higher valence state, and 1b3;
    • (c) XY4 is selected from the group consisting of XO4-xYx, XO4-yY2y, X"S4, and a mixture thereof, where X is P, As, Sb, Si, Ge, S, and mixtures thereof; X" is P, As, Sb, Si, Ge, and mixtures thereof, Y is halogen, 0x3, 0y4, and 0c3; and
    • (d) Z is OH, a halogen, mixtures thereof, and 0d6.
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