NEGATIVE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY PREPARING METHOD FOR THE SAME AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

• Main Authors: SHIM HYEONWOO, KWON SEMAN, HONG SOONHO
• Format: Patent
• Language: English; Korean
• Published: 14.12.2021
• 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 active material for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery including the same, wherein the negative electrode active material for a lithium secondary battery includes: a porous core in which flaky nano-silicon fragments are connected in an entangled shape; and a shell layer surrounding the core, and the shell layer includes a carbon-based material and silicon and has a thickness of more than 10 to less than 60% based on the average particle diameter (D50) of the negative electrode active material. 본 발명은 인편상 나노 실리콘 절편들이 인탱글형으로(entangled) 연결된 다공성 코어; 및 상기 코어를 감싸는 쉘 층을 포함하는 리튬 이차 전지용 음극 활물질이되, 상기 쉘 층은 탄소계 물질 및 실리콘을 포함하고, 상기 쉘 층은 상기 음극 활물질의 평균 입경(D50)을 기준으로 10 초과 내지 60% 미만의 두께를 가지는 것인 리튬 이차 전지용 음극 활물질, 이의 제조방법 및 이를 포함하는 리튬 이차 전지를 제공한다.