Abstract:
Disclosed is a method for reforming the surface of a positive electrode active material for a lithium rechargeable battery by which electrochemical characteristics, thermal stability, and the likes are improved through a coating treatment of nanoparticles for the lithium rechargeable battery or positive electrode active material powder with a non-uniform shape with a stable material. The present invention provides a method for reforming the surface of a positive electrode active material for a lithium rechargeable battery, including (a) a step for dissolving dopamine in a buffer solution; (b) a step for forming a polydopamine thin film on the surface of the positive electrode active material through the addition and reaction of the positive electrode active material to and with the buffer solution in which the dopamine is dissolved; (c) a step for attaching an ion group of a coating precursor material or a hydrate to the surface of the positive electrode active material by the polydopamine through the addition and reaction of the positive electrode active material where the polydopamine thin film is formed to and with a coating solution containing the coating precursor material containing a metal element; and (d) a step for removing the polydopamine thin film through a heat treatment of the reactant of step (c) and forming a coating layer containing a compound containing the metal element on the surface of the positive electrode active material.
Abstract:
본 발명은 카본/촉매 복합체의 제조와 그 응용에 관한 것으로, (a) 완충용액에 도파민을 용해시키는 단계와, (b) 도파민이 용해된 완충용액에 카본을 첨가하여 반응시킴으로써 카본의 표면에 폴리도파민을 코팅하는 단계와, (c) 촉매의 소스가 되는 산화물이 용해된 코팅용액을 준비하는 단계와, (d) 상기 코팅용액에 상기 (b) 단계의 폴리도파민 코팅 카본을 첨가하여 반응시키는 단계 및 (e) 반응물을 열처리하는 단계를 포함하는 폴리도파민을 이용한 카본/촉매 복합체의 제조방법과, 이에 따라 제조되는 카본/촉매 복합체 및 이를 공기전극으로 이용한 리튬/공기 이차전지를 제공함으로써 카본 본래의 특성을 충분히 발현할 수 있고, 환경오염을 방지할 수 있을 뿐 아니라 이차전지의 공기전극 효율도 극대화할 수 있다.
Abstract:
The present invention relates to a method for manufacturing a carbon-catalyst composite and applications thereof. The manufacturing method comprises the steps of: melting dopamine in a buffer solution; coating polydopamine on the surface of carbon by a reaction adding carbon in the buffer solution melted with dopamine; preparing a coating solution melted with oxides which will be sources for the catalyst; having a reaction by adding the polydopamine-coated carbon in the coating solution; and thermal processing the outcome. By providing the carbon-catalyst composite manufactured thereby and the lithium-air secondary battery using the carbon-catalyst composite as an air electrode, the original characteristics of carbon can be expressed enough, environment pollution can be prevented, and the air electrode efficiency of the secondary battery can be maximized.
Abstract:
본 발명은 카본 미소구체 및 촉매 산화물을 복합화한 리튬-공기 이차전지용 나노복합체 및 그 제조방법에 관한 것으로, 카본 미소구체 및 촉매 산화물을 일체형으로 복합화한 리튬-공기 이차전지용 나노복합체 및 그 제조방법을 제공하여, 촉매 기능을 가지고 있는 산화물과의 반응이 일어나는 장소가 되고, 생성된 전자가 수집되고 생성된 부반응물의 저장소 역할을 하는 카본을 효율적으로 결합시켜 리튬-공기 이차전지의 공기전극의 효율을 향상시키는 구조의 리튬-공기 이차전지용 나노복합체를 제공하고, 이러한 리튬-공기 이차전지용 나노복합체 구조를 갖도록 하는 제조방법을 제공할 수 있다.
Abstract:
PURPOSE: A nanocomposite for a lithium-air secondary battery is provided to improve efficiency of an air electrode of a lithium-air secondary battery by efficiently combining carbon, thereby capable of providing a lithium-air secondary cell having innovative charging/discharging capacity. CONSTITUTION: A nanocomposite for a lithium-air secondary battery comprises: a step of stirring carbon precursor by distilled water, hydrothermal synthesis, and cooling at room temperature; a step of preparing carbon microsphere by dispersing and drying by using centrifugation and a dispersion media; a step of conducting ultrasonic treatment by stirring the carbon microsphere and a catalyst oxide together with distilled water; a step of aging and heat treatment; and a step of dispersion by using centrifugation and a dispersion media, and drying the dispersion to manufacture carbon microsphere-catalyst oxide composite.