POSITIVE ELECTRODE ACTIVE MATERIAL FOR A LITHIUM-ION BATTERY, POSITIVE ELECTRODE FOR A LITHIUM-ION BATTERY, LITHIUM-ION BATTERY USING SAME, AND PRECURSOR TO A POSITIVE ELECTRODE ACTIVE MATERIAL FOR A LITHIUM-ION BATTERY

摘要

The present invention provides a positive electrode active material for lithium ion batteries, which realizes a lithium ion battery that is, while satisfying fundamental characteristics of a battery (capacity, efficiency, load characteristics), low in the resistance and excellent in the lifetime characteristics. In the positive electrode active material for lithium ion batteries, the variation in the composition of transition metal that is a main component inside of particles of or between particles of the positive electrode active material, which is defined as a ratio of the absolute value of the difference between a composition ratio inside of the particles of or in a small area between the particles of the transition metal and a composition ratio in a bulk state to the composition ratio in a bulk state of the transition metal, is 5% or less.