PRODUCTION OF LITHIUM-MANGANESE MULTIPLE OXIDE FOR NON- AQUEOUS LITHIUM SECONDARY BATTERY AND USE OF THE MULTIPLE OXIDE

摘要

PROBLEM TO BE SOLVED: To obtain the subject multiple oxide excellent in charge/discharge cycle characteristics both at room temperature and higher temperatures by subjecting a mixture of lithium carbonate and a manganese compound to primary burning at a specific temperature followed by cooling and grinding the product and then by subjecting the product to secondary burning followed by addition of lithium carbonate and then further burning the resultant homogeneous mixture at a specified temperature. SOLUTION: This multiple oxide is obtained by the following steps: lithium carbonate is mixed with manganese dioxide or manganese carbonate so as to be about (0.8-1.2):2 in the molar ratio Li/Mn, the mixture is subjected to primary burning at 400-700 deg.C and then cooled to <=100 deg.C to penetrate lithium ions into the pores of the manganese compound, and the product is ground at <=100 deg.C so as to be about 1-100 μm in average particle size; the ground product is then subjected to secondary burning at 700-950 deg.C followed by adding such an amount of lithium carbonate to the ground product thus burned as to be about (0.01-0.30) :2 in the molar ratio Li/Mn followed by homogeneous mixing; subsequently, the resultant mixture is further burned at 500-950 deg.C, thus obtaining the objective lithium-manganese multiple oxide having two-layer structure.