Electrodes comprising mixed active particles

H - Electricity – 01 – M

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H01M 4/58 (2010.01) H01M 4/13 (2010.01) H01M 4/1315 (2010.01) H01M 4/136 (2010.01) H01M 4/485 (2010.01) H01M 4/525 (2010.01) H01B 1/02 (2006.01) H01M 4/36 (2006.01) H01M 4/50 (2010.01) H01M 10/052 (2010.01)

Patent

CA 2520876

Electrode active materials comprising two or more groups of particles having différing chernical compositions, wherein each group of particles comprises a material selected from: (a) materials of the fonnula A1aM1b(XY4)cZd; and (b) materials of the formula A2eM2fOg; and wherein (i) A1, A2 , and A3 are Li, Na, or K; (ii) M1 and M3 comprise a transition metal; (iv) XY4 a phosphate or similar moiety; and (v) Z is OH, or halogen. In a preferred embodiment, A2eM3Og is A3hMniO4 having an inner and an outer region, wherein the inner region comprises a cubic spinel manganese oxide, and the outer region comprises a manganese oxide enriched in Mn+4 relative to the inner region. In a preferred embodiment, the compositions also comprise a basic compound.

Matières actives pour électrodes, qui contiennent deux groupes de particules ou plus ayant des compositions chimiques différentes, chaque groupe de particules comportant une matière choisie parmi (a) des matières de formule A?1¿¿a?M?1¿¿b?(XY¿4?)¿c?Z¿d? et (b) des matières de formule A?2¿¿e?M?2¿¿f?O¿g?. Dans ces formules, (i) A?1¿, A?2 ¿ et A?3¿ représentent Li, Na ou K, (ii) M?1¿ et M?3¿ comportent un métal de transition, (iv) XY¿4? représente un phosphate ou une fraction similaire et (v) Z représente OH ou halogène. Dans un mode de réalisation préféré, A?2¿¿e?M?3¿¿f?O¿g? représente A?3¿¿h?Mn¿i?O¿4? ayant une région interne et une région externe, la région interne comportant un oxyde de manganèse de type spinelle cubique et la région externe comportant un oxyde de manganèse enrichi en Mn?+4¿ par rapport à la région interne. Dans un mode de réalisation préféré, lesdites compositions contiennent également un composé basique.

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