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.

摘要

Disclosed is a positive electrode active material powder for lithium ion batteries, which is composed of lithium manganate particles which comprise Li and Mn as the main components and has cubic spinel structure (Fd-3m). The positive electrode active material powder is characterized in that the primary particles have a polyhedral shape with 12 or more faces and a mean primary particle diameter of 1 to 20μm. In each primary particle having the polyhedral shape, no crystal faces equivalent to the (111) plane are adjacent to each other, and flat crystal faces meet with each other to form distinct edges. The positive electrode active material powder exhibits excellent packing properties, load characteristics, and high-temperature stability.