NEGATIVE ELECTRODE ACTIVE MATERIAL NEGATIVE ELECTRODE COMPRISING THE NEGATIVE ELECTRODE ACTIVE MATERIAL AND LITHIUM SECONDARTY BATTERY COMPRISING THE NEGATIVE ELECTRODE

• Main Authors: KIM EUN KYUNG, LEE SU MIN, OH IL GEUN, KIM DONG HYUK, LEE YONG JU, CHOI JUNG HYUN, JO RAE HWAN, PARK SE MI
• Format: Patent
• Language: English; Korean
• Published: 17.05.2019
• 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 active material, which comprises: spherical carbon-based particles; and a carbon layer disposed on the spherical carbon-based particles and comprising nanoparticles. The nanoparticle comprises: a silicon core; an oxide film layer disposed on the silicon core and comprising SiO_x (0<x<=2); and a coating layer covering at least a part of a surface of the oxide film layer and containing LiF. The initial efficiency and discharge capacity of the battery can be enhanced by the coating layer containing LiF. 구형의 탄소계 입자; 및 상기 구형의 탄소계 입자 상에 배치되며, 나노 입자를 포함하는 탄소층을 포함하며, 상기 나노 입자는, 실리콘 코어; 상기 실리콘 코어 상에 배치되며 SiO(0<x≤2)를 포함하는 산화막층; 및 상기 산화막층의 표면의 적어도 일부를 덮으며 LiF를 포함하는 코팅층을 포함하는 음극 활물질에 관한 것이다.