SECONDARY BATTERY AND BATTERY MODULE INCLUDING SAME

• Main Authors: RYU, Sang Baek, JANG, Hwan Ho, NOH, Mi Jung, KIM, Moon Sung, KIM, Hyo Mi, YOOK, Seung Hyun, PARK, Da Hye, CHUNG, Da Bin, HAN, Jun Hee
• Format: Patent
• Language: English
• Published: 28.09.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

In accordance with an embodiment of the present disclosure, there are provided a secondary battery and a battery module including the secondary battery as a unit battery, the secondary battery including an electrode assembly including a first electrode group including a first cathode; and a second electrode group including a second cathode, wherein the first cathode includes a first cathode active material, and the second cathode includes a first cathode active material and a second cathode active material, and wherein the first cathode active material is a lithium-nickel composite oxide having primary particles whose particle diameter is less than or equal to 1 μm, and the second cathode active material is a lithium-nickel composite oxide having primary particles whose particle diameter is greater than 1 μm.