Anode Comprising Graphite and Silicon-based material having the Different Diameter and Lithium Secondary Battery Comprising the Same

• Main Authors: PARK SUNGHAE, KWAK JINGOO, SONG HYEON MIN, PARK HAN SOL, KIM SUE JIN, SUNG JOO HWAN, PARK YOUNGUK, CHOI JUNGHYUN, JANG JINSU, CHO MINSU
• Format: Patent
• Language: English; Korean
• Published: 07.05.2020
• 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 negative electrode for a lithium secondary battery, which has a negative electrode material layer formed on at least one side of a negative electrode current collector, and to a lithium secondary battery comprising the negative electrode, wherein the negative electrode material layer comprises large-particle graphite, small-particle silicon-based material, micro-particle graphite, and carbon nanotubes, wherein the following conditions 1 to 3 are satisfied: [Condition 1] average diameter of large-particle graphite D50 (D_1): 1 μm to 50 μm; [Condition 2] average diameter of small-particle silicon-based material D50 (D_2): 0.155 D_1 to 0.414 D_1; and [Condition 3] average diameter of micro-particle graphite D50 (D_3): 0.155 D_1 to 0.414 D_1, or 0.155 D_2 to 0.414 D_2. 본 발명은, 음극재층이 음극 집전체의 적어도 일면에 형성되어 있는 리튬 이차전지용 음극으로서, 상기 음극재층은, 대립자 흑연, 소립자 실리콘계 소재, 미립자 흑연, 및 탄소 나노 튜브를 포함하며, 하기 조건 1 내지 3을 만족하는 리튬 이차전지용 음극 및 이를 포함하는 리튬 이차전지에 관한 것이다: [조건 1] 대립자 흑연의 평균 직경 D50(D): 1 내지 50㎛ [조건 2] 소립자 실리콘계 소재의 평균 직경 D50(D): 0.155D내지 0.414D[조건 3] 미립자 흑연의 평균 직경 D50(D): 0.155D내지 0.414D, 또는 0.155D내지 0.414D.