Method of Preparing Positive Electrode Active Material

• Main Authors: Park, Kang Joon, Park, Sang Min, Do, Joong Yeop, Han, Gi Beom, Lee, Dae Jin, Jung, Wang Mo, Lho, Eun Sol, Kwak, Min, Lee, Sang Wook
• Format: Patent
• Language: English
• Published: 02.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A method of preparing a positive electrode active material is disclosed herein. The method may ensure surface and coating uniformity of first and second lithium transition metal oxides in the positive electrode active material. In some embodiments, the method includes washing a mixture of a first lithium transition metal oxide having a first Brunauer-Emmett-Teller (BET) specific surface area and a second lithium transition metal oxide having a second BET specific surface area with a washing solution, an amount of the washing solution based on 100 parts by weight of the mixture satisfies Equation 1: 5,000×(x1w1+x2w2)≤the amount of the washing solution ≤15,000×(x1w1+x2w2), x1 and x2 are the first and second BET specific surface areas, respectively, and w1 and w2 are weight ratios of the first and second lithium transition metal oxides based on a total weight of the mixture, respectively.