Lithium manganate particles for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous 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 (D50) 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:
Li1+xMn2−x−yY1yO4+Y2where 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, andan X-ray diffraction intensity ratio of I(400)/I(111) of the particles being not less than 38% andan X-ray diffraction intensity ratio of I(440)/I(111) thereof being not less than 18%.

主权项

1. A process for producing lithium manganate particles having a primary particle diameter of not less than 1 μm, an average particle diameter (D50) of 1 to 15 μm and forming particles having substantially a single phase, which have a composition represented by the following chemical formula:
Li1+xMn2−x−yY1yO4+Y2 where Y1 is Al; Y2 is at least one other 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%, wherein the lithium manganate particles have a lattice constant of 0.818 to 0.821 nm, the process comprising the steps of: mixing lithium carbonate, trimanganese tetraoxide (Mn3O4) coated with an Al compound, and the sintering aid having a melting point of not higher than 800° C. with each other; and then calcining the resulting mixture at a temperature of 800 to 1050° C. to produce the lithium manganate particles.