POSITIVE ELECTRODE MATERIAL BASED ON A LAMELLAR LITHIA OXIDE COVERED, IN WHOLE OR PART, BY ANOTHER MANGANESE-BASED OXIDE AND PROCESS FOR THE PREPARATION OF THIS MATERIAL

摘要

Disclosed is a positive electrode material for a lithium battery comprising a lithiated metal lamellar oxide comprising one or more metal elements arranged in the form of metal cation sheets and lithium arranged in lithium cation inter sheets and, in part , in the metal cation sheets, said interleaves ensuring the separation between said sheets, said oxide having an O2 stack and corresponding to the following formula (I): Li (a + b) NicMndCOeMfOg (I) in which: * a represents the proportion of lithium included in the interleaves and being greater than 0 and less than or equal to 1; * b represents the proportion of lithium included in the metal cation sheets and being greater than 0 and less than or equal to (1/3); * c, d, e and f are between 0 and 1, with the condition that b + c + d + e + f = 1; * g is between 1.9 and 2.1; * when f is other than 0, M is at least one element selected from Al, Fe, Ti, Cr, V, Cu, Mg, Zn, Na, K, Ca, Sc and combinations thereof; characterized in that said oxide is covered, in whole or in part, with an oxide of the following formula (II): MnhM'iCO2 (II) in which: * 0