| abstract |
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+, >Ca<2+>, Al<3+>,Zn<2+>, 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. |