Cathode active material, cathode and nonaqueous secondary...

H - Electricity – 01 – M

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H01M 4/58 (2010.01)

Patent

CA 2762142

A positive pole active material has a composition represented by the following general formula (1) LiFe1-xMxP1-ySiyO4 (1) (where the average valency of the Fe is +2 or greater; M is an element having a valency of +2 or greater and is at least one selected from the group consisting of Zr, Sn, Y and Al; the valency of M and the average valency of Fe are different; 0<x?0.5; andy=x × (valency of M 2) + (1-x)×(average valency of Fe 2)). The resulting positive pole active material is excellent in terms of safety and cost, and is capable of providing a long-life cell.

La composition du matériau actif de pôle positif selon l'invention est représentée par la formule générale (1) suivante : LiFe1-xMxP1-ySiyO4 (1) (où la valence moyenne du Fe est +2 ou plus ; M est un élément qui a une valence égale à +2 ou plus et qui est au moins un élément choisi dans le groupe constitué par Zr, Sn, Y et Al ; la valence de M et la valence moyenne du Fe sont différentes ; 0 < x ? 0,5 ; et y = x × (valence de M 2) + (1 - x) × (valence moyenne du Fe 2)). Le matériau actif de pôle positif ainsi obtenu possède d'excellentes propriétés de sécurité et de coût, et il assure aux accumulateurs une longue durée de vie.

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