A Cathode Active Material Anode and A Lithium Ion Secondary Battery Having The Same and A Fabricating Method Thereof
The present invention relates to a positive electrode active material having a coating layer formed on a surface thereof in order to suppress the occurrence of swelling in a lithium ion secondary battery, a positive electrode comprising the same, a lithium ion secondary battery comprising the positi...
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| Format: | Patent |
| Sprache: | eng ; kor |
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| Zusammenfassung: | The present invention relates to a positive electrode active material having a coating layer formed on a surface thereof in order to suppress the occurrence of swelling in a lithium ion secondary battery, a positive electrode comprising the same, a lithium ion secondary battery comprising the positive electrode, and a method for manufacturing the lithium ion secondary battery. The present invention is characterized in that a passivation layer formed by stabilizing residual lithium on the surface of the positive electrode active material is continuously formed on the surface. According to the present invention, by suppressing a side reaction with an electrolyte generated on the surface of the positive electrode active material, the swelling phenomenon caused by gas generation can be prevented, and a positive electrode active material, a positive electrode, and a lithium ion secondary battery with excellent performances such as capacity, rate characteristics, and cycle life can be implemented.
본 발명은 리튬이온이차전지에서의 스웰링(swelling) 발생을 억제하기 위하여 표면에 코팅층을 형성한 양극활물질, 이를 포함하는 양극, 이를 포함하는 리튬이온이차전지 및 그 제조 방법에 관한 것이다. 본 발명은 양극활물질 표면의 잔류 리튬을 안정화 하여 형성된 안정화층(passivation layer)이 표면에 연속적으로 형성된 것을 특징으로 한다. 본 발명에 의하면, 양극활물질 표면에서 발생하는 전해질과의 부반응을 억제함으로써 가스 발생으로 인한 스웰링 현상을 방지하고, 용량, 율 특성, 사이클 수명 등 성능이 우수한 양극활물질, 양극 및 리튬이온이차전지를 구현할 수 있다. |
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