CATHODE MATERIAL FOR LITHIUM SECONDARY BATTERY, AND CATHODE AND LITHIUM SECONDARY BATTERY EACH COMPRISING SAME

• Main Authors: PARK, Na Ri, LEE, Woo Ram, EOM, Jun Ho, KIM, Jae Geun, KANG, Dong Ryoung
• Format: Patent
• Language: English; French; German
• Published: 16.11.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a positive electrode material includes a first positive electrode active material, as large particles having a large average particle diameter, and a second positive electrode active material as small particles having a small average particle diameter, wherein the first positive electrode active material and the second positive electrode active material are each independently a lithium transition metal oxide having a molar ratio of nickel of 80 mol% or more relative to the total molar amount of transition metals in the lithium transition metal oxide, and the positive electrode material satisfies Equation (1): 0<B−A/B×100≤10 wherein, in Equation (1), A denotes a particle strength of the first positive electrode active material, and B denotes a particle strength of the second positive electrode active material.