New lithium insertion electrode materials based on...

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H01M 4/24 (2006.01) H01M 4/58 (2006.01) G02F 1/15 (2006.01) H01M 4/02 (2006.01) H01M 4/36 (2006.01) H01M 4/48 (2006.01) H01M 4/62 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2200998

A lithium insertion-type positive electrode materials having an olivine structure based on iron or manganese derivatives, whose general formula is: LiX yM1-(y+d+t+q+r)DdTtQqRr[PO4]1-(p+s+v) [SO4]p [siO4]s[VO4]v where: M represents Fe2+ or Mn2+ or mixtures thereof; D represents a metal in the +2 oxidation state, chosen among: Mg2+, Ni2+, Co2+, Zn2+, Cu2+, Ti2+; T represents a metal in the +3 oxidation state, chosen among: A13+, Ti3+, Cr3+, Fe3+, Mn3+, Ga3+, Zn2+, V3+ Q represents a metal in the +4 oxidation state, chosen among: Ti4+, Ge4+, Sn4+, V4+. R represents a metal in the +5 oxidation state, chosen among: V5+, Nb5+, Ta5+. All M, D, T, Q, R, are elements residing in octahedral sites; v is the stoichiometric coefficient for V5+ residing in tetrahedral sites. The stoichiometric coefficients x, y, d, t, q, r, p, s, v are all comprised between zero and one with at least one among of the y, d, t, q, r, p, s and v coefficients differing from zero. Other conditions are: 0 ~ x~ 1 y + d + t + q + r ~ 1 p+ s+v ~ 1 3 + s - p = x- y +t +2q +3r where x is the degree of intercalation during operation of the electrode material.

Matériau pour électrode positive de type à insertion de lithium, possédant une structure d'olivine, à base de dérivés du fer ou du manganèse, dont la formule générale est LiXyM1-(y+d+t+q+r)DdTtQqRr[PO4]1-(p+s+v) [SO4]p [siO4]s[VO4]v, où : M représente Fe2+ ou Mn2+ ou un mélange des deux; D représente un métal au niveau d'oxydation +2, choisi parmi Mg2+, Ni2+, Co2+, Zn2+, Cu2+ et Ti2+; T représente un métal au niveau d'oxydation +3, choisi parmi A13+, Ti3+, Cr3+, Fe3+, Mn3+, Ga3+, Zn2+ et V3+; Q représente un métal au niveau d'oxydation +4, choisi parmi Ti4+, Ge4+, Sn4+ et V4+. R représente un métal au niveau d'oxydation +5, choisi parmi V5+, Nb5+ et Ta5+. Tous les M, D, T, Q et R sont des éléments se trouvant dans des sites octaédrique; v est le coefficient stoechiométrique pour le V5+ situé dans des sites tétraédrique. Les coefficients stoechiométriques x, y, d, t, q, r, p, s, v sont tous compris entre zéro et un, et l'un au moins des coefficients y, d, t, q, r, p, s et v est différent de zéro. Les autres conditions sont les suivantes : 0 ~ x~ 1 y + d + t + q + r ~ 1 p+ s+v ~ 1 3 + s - p = x- y +t +2q +3r, où x est le degré d'intercalation pendant le fonctionnement du matériau d'électrode.

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