Methods of preparing positive electrode active materials, positive electrode active materials, and rechargeable lithium batteries

Abstract

A method of preparing a positive electrode active material includes preparing core particles including a lithium nickel-based composite oxide and mixing the core particles and water to wash the core particles. The method further includes removing a portion of the water so that the washing water is included in an amount of about 1 wt % to about 10 wt % based on a total 100 wt % of the core particles and washing water to obtain a washed product. The method also includes mixing the washed product, an aluminum raw material and a metal raw material into a mixer and performing heat treatment at about 300° C. to about 400° C. The metal raw material is a boron raw material or a tungsten raw material.

Dependencies are inferred from the claim text.