摘要:
The invention concerns a synthesis method for a material consisting of particles comprising a core and a coating and/or being interconnected by a carbon cross-linkage, the core of said particles including at least a compound of formula LixM1-yM'y(XO4)n wherein: x, y and n are numbers such that 0≤ x ≤2, 0 ≤ y ≤0.6 and 1 ≤ n ≤1.5; M is a transition metal; M' is a element of fixed valency, and the synthesis being performed by reacting and balancing the mixture of precursors, with a reducing gas atmosphere, so as to bring the transition metal(s) to the desired degree of valency, the synthesis being carried out in the presence of a carbon source called conductive carbon which is pyrolyzed. The resulting materials exhibit excellent electrical conductivity and a highly enhanced chemical activity. M' can be selected among Mg?2+, Ca2+ Al3+, Zn2+¿ or a combination of those elements, X is selected among S, P, and Si. Said material can be used as active electrode material in batteries.
摘要:
The invention concerns a method for the synthesis of compounds of formula C-LixM1-y(XO4)n wherein: x, y and n represent numbers such that 0 ≤ x 2, 0 ≤ m ≤ 0.6 and 1 ≤ n ≤ 1.5; M is a transition metal or a mixture of transition metals of the first line of the periodic table; M' is an element with fixed valency selected among Mg?2+, Ca2+, Al3+,Zn2+¿, or a combination of said elements; and X is selected among S, P and Si, by balancing in appropriate proportions a mixture or precursors, the synthesis being performed by reacting and balancing a mixture of precursors in the appropriate proportions of precursors, with a gaseous atmosphere, the method comprising at least a step of pyrolyzing a carbon-producing compound so as to obtain a compound whereof the electronic conductivity, measured on a sample of compacted powder, at a pressure of 3750 Kg.cm-2, is higher than 10?-8 S.cm-1¿. The resulting materials are thus formed by the particles of the compound coated with a conductive carbon layer.