Abstract:
PURPOSE: A positive electrode active material for a lithium secondary battery is provided to offer high structural stability at high temperatures, a uniform spherical shape, and wide surface area. CONSTITUTION: A positive electrode active material for a lithium secondary battery is denoted by chemical formula 1: Li_(1+alpha)[M_gammaFe_(1-beta)Mn_beta]O_2 or chemical formula 2: (1-x)Li_2MnO_3-xLi[M_zFe_(1-y)Mn_y]O_2. In the chemical formula 1, M is one compound selected from Ni, Mg, Cu, Co, Al, Nb, Ti, and V, and alpha, beta, and gamma satisfy 0.1
Abstract:
본 발명은 리튬이차전지 양극활물질용 전구체인 복합금속산화물 및 그 복합금속산화물의 제조방법, 그 복합금속산화물을 갖는 양극활물질 및 제조방법 그리고, 그 양극활물질을 포함한 리튬이차전지에 관한 것이다. 보다 상세하게는, 니켈, 코발트 및 망간으로 금속수용액을 제조하는 단계; 금속수용액에 침전제로서 탄산나트륨과 공침제로서 암모니아수를 혼합하여, 연속반응기에 투입시켜 교반하여 코어부를 얻는 단계; 연속적으로 코어부를 전이금속혼합계 수용액에 침전제와 공침제를 혼합하여 코어부의 표면에 전이금속산화물층인 쉘부를 형성하는 단계; 여과 및 세척 후 건조하여 전구체를 제조하는 단계; 및 전구체를 리튬염과 혼합하는 단계를 포함하여 입자크기와 입도가 균일하고 표면이 제어된 코어-쉘 이중층 구조를 갖는 리튬이차전지용 양극활물질의 제조방법 및 그 양극활물질을 포함한 리튬이차전지에 관한 것이다.
Abstract:
PURPOSE: A lithium secondary battery is provided to offer high capacity, charging density, electrochemical property, and excellent lifetime property of a positive electrode active material having a core-shell two layer structure. CONSTITUTION: A production method of a composite metal oxide which is a precursor for a positive electrode active material for a lithium secondary battery comprises the following steps: selecting three kinds of compounds from nickel, cobalt, iron, manganese, and aluminum to produce a metal solution; adding a precipitation agent and a carrier to the metal solution, inserting the mixture into a continuous reactor for stirring and obtaining a core unit; mixing the core unit with a transition metal mixed aqueous solution, the precipitation agent, and the carrier to form a transition metal oxide layer on the surface of the core unit as a shell; and filtering, washing, and drying to obtain the precursor. The positive electrode active material has a core-shell two layer structure. The precipitation agent is sodium carbonate, and the carrier is an ammonia solution.
Abstract:
본 발명은 리튬이차전지용 양극활물질 및 그 제조방법에 관한 것으로, 보다 상세하게는 공침법을 이용하여 입자크기 및 입도가 균일하고, 표면형태가 구형으로 제어된 금속산화물 전구체를 제조하고, 이를 이용하여 제조되어 구형의 형상을 가지며, 표면적이 넓은 화학식 1 또는 2로 표시되는 리튬이차전지용 양극활물질 및 그 제조방법에 관한 것이다. 본 발명에 의하면, 간단한 공정으로 고온에서 높은 구조적 안정성을 가지며, 균일한 구형의 형상을 가지는 양극활물질을 효율적으로 생산할 수 있다. [화학식 1] Li 1+α [M β Fe 1-γ Mn γ ]O 2 (상기 화학식 1에서, M은 Ni, Mg, Fe, Cu, Co, Al, Nb, Ti 및 V 중 선택된 어느 하나이고, 0.1≤α≤0.9, 0.1≤β≤0.9, 0≤γ≤0.9임) [화학식 2] 1-xLi 2 MnO 3 - xLi[M z Fe 1-y Mn y ]O 2 (상기 화학식 2에서, M은 Ni, Mg, Fe, Cu, Co, Al, Nb, Ti 및 V 중 선택된 어느 하나이고, 0.1≤x≤0.9, 0.1≤y≤0.9, 0≤z≤0.9임)
Abstract:
The present invention relates to a manufacturing method of positive electrode active material which has a shape of nanofiber having a large superficial dimension by using an electric radiation method. The present invention comprises: a first step of manufacturing a core viscous solution by mixing a source material measured as stoichiometric ratio according to an empirical formula which is represented as: LiFe1-xMxPO4 (0
Abstract:
PURPOSE: A manufacturing method of an anode active material is provided to manufacture a lithium-iron-metal phosphate-carbon composite nanofiber anode active material with a large surface area by controlling the lithium-iron-metal phosphate-carbon composite to the nanofiber form using electric radiation. CONSTITUTION: A manufacturing method of a lithium-iron-metal phosphate-carbon composite nanofiber anode active material using electric radiation comprises: a first step of making a viscid solution by mixing a raw material, which is quantified by stoichlometric ratio with the empirical formula: LiFe1-xMxPO4 (0
Abstract:
PURPOSE: A manufacturing method of a positive active material is provided to manufacture a Li[Ni1/3Co1/3Mn1/3]O2 positive active material with improved surface area and high voltage performance by using an electrospinning method. CONSTITUTION: A manufacturing method of a Li[Ni1/3Co1/3Mn1/3]O2 positive active material comprises a step of preparing a solution including a precursor of the Li[Ni1/3Co1/3Mn1/3]O2 positive active material; a step of electrospinning the solution and drying the solution to manufacture nanofiber; and a step of heat-treating the dried nanofiber. The heat-treatment step consists of a first heat treatment at 450-550 °C and a second heat treatment at 600-900 °C and is conducted under an oxygen atmosphere. [Reference numerals] (AA) Preparing raw material; (BB) Mixing and stirring; (CC) Electric radiating; (DD) Drying and pulverizing; (EE) Heat treating (Air/O_2 atmosphere)