abstract |
Electrode active materials comprising lithium or other alkali metals, a transition metal, and a phosphate or similar moiety, of the formula: n nA a+x M b P 1−x Si x O 4 nwherein (a) A is selected from the group consisting of Li, Na, K, and mixtures thereof, and 0<a<1.0 and 0≦x≦1; (b) M comprises one or more metals, comprising at least one metal which is capable of undergoing oxidation to a higher valence state, where 0<b≦2; and wherein M, a, b, and x are selected so as to maintain electroneutrality of said compound. |