Abstract:
PURPOSE: A method for fabricating a lithium titanium oxide-carbon composite nanofiber sheet is provided to improve electric conductivity. CONSTITUTION: A method for fabricating a litium titanium oxide-carbon composite nanofiber sheet(400) comprises: a step of mixing a lithium source material(10), a titanium source material(20), an oxidizer, a first polymer material(40), and a solvent(50) to prepare an intermediate mixture; a step of preparing a nano fiber sheet from the intermediate by electrospinning; a step of performing a second polymer material(60); and a step of performing thermal treatment of the nano fiber sheet. The solvent is distilled water, N,N-dimethyl formamide, N,N-diethyl formamide, dimethyl sulfoxide, or N-methyl pyrrolidone.
Abstract:
본 발명은 (a) 리튬(Li)의 공급원 물질과 티타늄(Ti)의 공급원 물질을 전기방사가 가능하도록 적절히 혼합하여 중간혼합물을 제조하는 단계, (b) 상기 중간혼합물과 전기방사가 가능한 두 가지 이상의 고분자 물질을 혼합하여 중간화합물을 제조하는 단계, (c) 상기 중간화합물을 적절한 전압 및 유량 조건에서, 전기방사를 통해서 지름이 약 5 ~ 1000 nm 범위로 조절된 나노섬유 형태의 웹을 제조하는 단계 및 (d) 상기 웹을 열처리하여 지름이 약 5 ~ 1000 nm 범위를 갖는 나노섬유 형태의 리튬티타늄산화물(Li 4 Ti 5 O 12 )을 제조하는 단계를 포함하는 방법을 제공하며, 상기 방법을 통해 제조된 리튬티타늄산화물 나노 섬유를 음극 활물질로 가지는 리튬이차전지를 제공한다. 본 발명은 리튬티타늄산화물 나노 섬유를 제조할 때 전기방사를 이용함으로써, 지름 크기가 조절된 나노섬유 형태를 구현할 수 있으며, 이를 통해 표면에서의 전하 교환 반응을 활성화하여 높은 충방전 속도(charge/discharge rate) 특성을 유지할 수 있다.
Abstract:
PURPOSE: A cup-type carbon nano-tube and a method for manufacturing the same are provided to obtain the superior dispersibility with respect to aqueous solution, organic-based solution, or polymer-based solution by dispersing edge carbon on the inner surface of the carbon nano-tube. CONSTITUTION: A cut-type carbon nano-tube is synthesized by the reaction of the mixture of gaseous carbon precursor, ambient gas, and catalytic gas. The mixture is reacted in a reactor(210). A carbon layer outer wall is formed on the axial direction of the carbon nano-tube. The carbon layer outer wall is inclined into a pre-set angle. Edge carbon is dispersed on the inner surface of the carbon nano-tube. The inner side of the carbon nano-tube is hollow.
Abstract:
Provided are a method for manufacturing a nanocarbon-metal/metal oxide composite, a nanocarbon-metal/metal oxide composite manufactured by using the same, and a lithium ion rechargeable battery containing the same. The method for manufacturing a nanocarbon-metal/metal oxide composite according to the present invention includes a step for manufacturing a mixture by mixing a nanocarbon precursor, a metal/metal oxide precursor, and a metal oxidizing agent; and a step for manufacturing a nanocarbon-metal/metal oxide composite from the mixture by using a solid solvothermal reaction.
Abstract:
계층적 기공구조를 가지는 흡착제의 제조방법이 제공된다. 본 발명에 따른 계층적 기공구조를 가지는 흡착제의 제조방법은, 무기 전구체, 유기 전구체 및 제1 용매를 혼합한 혼합물을 제공하는 단계와, 상기 혼합물을 열처리하여 무기-유기 골격 구조체를 합성하는 단계와, 상기 무기-유기 골격 구조체를 제2 용매로 워싱한 후 건조하는 단계와, 소정의 온도범위에서 상기 무기-유기 골격 구조체를 열분해하여 탄화 무기-유기 골격 구조체를 제조하는 단계와, 상기 탄화 무기-유기 골격 구조체의 기공을 활성화시키는 단계를 포함한다.
Abstract:
PURPOSE: A manufacturing method of graphene using sulfuric acid, ring breakage graphite oxide manufactured by the same and reduced graphite oxide are provided to cut production costs and the degree of the environmental risks because sulfuric acid used as graphite oxide is inexpensive and has a lower degree of the environmental risk than the conventional reducing agent. CONSTITUTION: A manufacturing method of graphene comprises the steps of: preparing graphite oxide, manufacturing a first mixed solution by mixing graphite oxide with a dispersed agent including sulfuric acid, filtering the first mixed solution to get a first mixture remained, drying the first mixed solution to produce ring breakage graphite oxide and producing reduced graphite oxide from the ring breakage graphite oxide.