Composite anode active material

• Main Authors: LEE JAE WON, PARK YANG KYU
• Format: Patent
• Language: English; Korean
• Published: 25.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

본 발명은 활물질에 금속산화물층 및 탄소코팅층을 포함하는 복합 음극 활물질에 관한 것으로써, 본 발명에 따른 복합 음극 활물질은 나노 실리콘 혼합입자를 포함하는 활물질에 금속산화물층, 및 탄소코팅층을 두께 방향으로 차례로 포함함으로써, 나노 실리콘 혼합입자를 포함하는 활물질의 부피 팽창을 억제시킬 뿐만 아니라, 리튬 관련 성분과의 부반응을 감소시켜 전기 전도도 및 이온 전도도를 향상시키는 특징이 있고, 상기 특징을 만족함에 따라, 본 발명에 따른 복합 음극 활물질은 우수한 용량, 및 우수한 사이클 수명을 갖는 장점이 있다. The present invention relates to a composite anode active material comprising a metal oxide layer and a carbon coating layer in an active material and a manufacturing method thereof. The composite anode active material according to the present invention includes, sequentially in a thickness direction: a metal oxide layer in an active material containing nano-silicon mixed particles; and a carbon coating layer, thereby having characteristics of enhancing electrical conductivity and ionic conductivity by reducing side reactions with lithium-related components as well as suppressing the volume expansion of the active material containing the nano-silicon mixed particles. As the characteristics are satisfied, the composite negative electrode active material according to the present invention has the advantages of excellent capacity and excellent cycle life.