NEGATIVE ELECTRODE FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY INCLUDING SAME

• Main Authors: JUNG HYESEUNG, HAN SUNGSOO, KIM MINJAE, CHO CHAEWOONG, SEOL JONGHEON, HONG MINYOUNG, KIM SOOCHAN, NAM JUNGHYUN
• Format: Patent
• Language: English; Korean
• Published: 17.04.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same. The negative electrode contains a current collector and a negative electrode active material layer placed on the current collector and containing a negative electrode active material and a conductive material. The negative active material contains a silicon-based active material, and the conductive material contains a carbon nanotube. In the negative electrode active material layer, the negative electrode active material and the conductive material are contained to satisfy formula 1 and formula 2 below. [formula 1] 26 < A*B-{(C*D)/10} < 55 [formula 2] 600 <= D <= 1000 (In the formulas 1 and 2, A indicates wt% of the silicon-based active material contained in the negative electrode active material layer, and B indicates a specific surface area (m^2/g) in a gas adsorption method of the silicon-based active material contained in the negative electrode active material layer, C indicates wt% of carbon nanotube contained in the negative electrode active material layer, and D indicates a specific surface area (m^2/g) in a gas adsorption method of carbon nanotube contained in the negative electrode active material layer.) The purpose of the present invention is to provide a negative electrode for a rechargeable lithium battery with high energy density and cycle lifespan characteristics. 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지에 관한 것으로서, 상기 음극은 전류 집전체 및 상기 전류 집전체 상에 위치하고, 음극 활물질 및 도전재를 포함하는 음극 활물질층을 포함하고, 상기 음극 활물질은 실리콘계 활물질을 포함하고, 상기 도전재는 탄소나노튜브를 포함하고, 상기 음극 활물질층에서, 상기 음극 활물질과 상기 도전재는 하기 식 1 및 식 2의 관계를 만족하도록 포함된 것이다. [식 1] 26 < A*B-{(C*D)/10} < 55 [식 2] 600 ≤ D ≤ 1000 (상기 식 1 및 2에서, A는 상기 음극 활물질층에 포함된 상기 실리콘계 활물질의 중량%이고, B는 상기 음극 활물질층에 포함된 상기 실리콘계 활물질의 가스흡착법 비표면적(㎡/g)이고, C는 상기 음극 활물질층에 포함된 탄소나노튜브의 중량%이고, D는 상기 음극 활물질층에 포함된 탄소나노튜브의 가스흡착법 비표면적(㎡/g)임)