POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, POSITIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

摘要

A positive electrode active material for a lithium ion secondary battery includes secondary particles comprising a lithium-containing transition metal oxide having a layered structure. The secondary particles have a plurality of voids in the surface and inner part thereof. The secondary particles have as the secondary particle size a median diameter (D50) of 5 µm to 15 µm. The secondary particles are formed from an aggregate of primary particles having as the primary particle size a crystallite diameter of 30 nm to 200 nm.