Double oxides of lithium and manganese for positif electrode of electrochemical devices, its preparation electrodes containing this oxides

摘要

A new synthesis of oxides of formula LixMnyOz where x = 0 - 2; y = 1 - 3; and z = 3 - 4.5, with x, y and z being such that the oxide approximates to LiMn2O4; comprises the following stages: (a) preparation of a polymer complex of Li and Mn in the form of a gel or xerogel, by reacting, in a common solvent, a polymer, co-polymer or mixture of reducing polymer(s) with complexing functions for Li and Mn, oxidising salts of Li and Mn, and partially or totally evaporating the solvent; and (b) oxido-reductive explosive mineralisation of the Li/Mn complex obtained to form fine amorphous particles of the oxide of formula LixMnyOz.