Positive electrode active material for secondary batteries with nonaqueous electrolytic solution, process for the production of the active material, and secondary batteries with nonaqueous electrolytic solution

Abstract

The present invention relates to positive electrode active substance particles for lithium ion batteries, comprising lithium manganate particles comprising Li and Mn as main components and having a cubic spinel structure (Fd-3m), wherein primary particles of the positive electrode active substance have a dodecahedral or higher-polyhedral shape in which none of crystal planes equivalent to the (111) plane are located adjacent to each other, and flat crystal planes are crossed with each other to form a clear ridge, and an average primary particle diameter of the primary particles is not less than 1 μm and not more than 20 μm. The positive electrode active substance particles according to the present invention are excellent in packing property, load characteristics and high-temperature stability.

Dependencies are inferred from the claim text.