LITHIUM MANGANATE PARTICLE POWDER FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, METHOD FOR PRODUCING THE SAME, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The present invention relates to lithium manganate particles having a primary particle diameter of not less than 1 µm and an average particle diameter (D 50 ) of not less than 2 µm and not more than 10 µm as measured by a particle size distribution meter, and forming particles having substantially a single phase, which have a composition represented by the following chemical formula: Li 1 + x �¢ Mn 2 - x - y �¢ Y �¢ 1 y �¢ O 4 + Y �¢ 2
where Y1 is at least one element selected from the group consisting of Ni, Co, Mg, Fe, Al, Cr and Ti; Y2 is at least one element constituting a sintering aid having a melting point of not higher than 800°C, x and y satisfy 0.03 ‰¤ x ‰¤ 0.15 and 0.05 ‰¤ y ‰¤ 0.20, respectively, and Y2 is present in an amount of 0.1 to 2.5 mol% based on Mn;
the Y1 element being dispersed within the respective particles, and
an X-ray diffraction intensity ratio of I(400)/I(111) of the particles being not less than 38% and an X-ray diffraction intensity ratio of I(440)/I(111) thereof being not less than 18%.
The lithium manganate particles of the present invention have a high output and are excellent in high-temperature stability.