Patent ID: 6514640
Filing Date: 2003-02-04
Classification: C01B,G02F,H01M,Y02E,Y10T

Abstract:
A cathode material for a rechargeable electrochemical cell, said cell also comprising an anode and an electrolyte, the cathode material comprising a compound of the ordered or modified olivine structure having the formula:LixM1âˆ’(d+t+q+r)DdTtQqRr(XO4) wherein:N is a cation of a metal selected from the group consisting of Fe, Mn, Co, Ti, Ni or mixtures thereof; D is a metal having a +2 oxidation state selected from the group consisting of Mg2+, Ni2+, Co2+, Zn2+, Cu2+, and Ti2+; T is a metal having a +3 oxidation state selected from the group consisting of Al3+t, Ti3+, Cr3+, Fe3+, Mn3+, Ga3+, Zn3+, and V3+; Q is a metal having a +4 oxidation state selected from the group consisting of Ti4+; Ge4+; Sn4+, and V4+; R is a metal having a +5 oxidation state selected from the group consisting of V5+; Nb5+, and Ta5+; X comprises Si, S, P, V or mixtures thereof; 0&lE;x&lE;1; and 0&lE;d, t, q, r&lE;1, where at least one of d, t, q, and r is not 0.