| 摘要 |
An electrode active material comprising two or more groups of particles having differing chemical compositions, wherein each group of particles comprises a material selected from: (a) materials of the formula A2eM2fOg; and (b) materials of the formula A3hMniO4; wherein (i) A2, and A3 are independently selected from the group consisting of Li, Na, K, and mixtures thereof, 0<e≦̸6 and h≦̸2.0; (ii) M2 is one or more metals, comprising at least one metal selected from the group consisting of Fe, Co, Ni, Mo, V, Zr, Ti, Mo, and Cr, and 1≦̸f≦̸6; (iii) 0<g≦̸15; (iv) M2, e, f, g, h, and i, are selected so as to maintain electroneutrality of said compound; and (v) said material of the formula A3hMniO4 has an inner and an outer region, wherein the inner region comprises a cubic spinel manganese oxide, and the outer region comprises a manganese oxide that is enriched in Mn+4 relative to the inner region.
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