Abstract:
PURPOSE: Provided are a novel composite polymer electrolyte, a lithium secondary battery comprising the composite polymer electrolyte and their fabrication methods. The composite polymer electrolyte has improved adhesion with electrodes, good mechanical strength, improved performance at low and high temperatures, improved compatibility with organic electrolytes of lithium secondary battery and it can be applied to the manufacture of lithium secondary batteries. CONSTITUTION: The composite polymer electrolyte comprises super fine fibrous porous polymer electrolyte matrix with particles having diameter of 1 - 3000 nm, polymers and lithium salt-dissolved organic electrolyte solutions incorporated into the porous polymer electrolyte matrix. The fabrication method of the composite polymer electrolyte comprises the steps of: obtaining two or more polymeric solutions by dissolving two or more polymers which can be formed into fibers in a mixture of a plasticizer and an organic solvent respectively; filling the obtained polymeric solutions into different barrels of an electrospinning apparatus respectively and then discharging the polymeric solutions onto a substrate including a metal plate, a Mylar film and electrodes with different nozzles charged with a high voltage, to generate polymer electrolyte matrices in a state that the two or more polymer fibers are entangled with each other respectively; and injecting a polymer electrolyte solution containing a polymer and an organic electrolyte solution into the polymer electrolyte matrices. The lithium secondary battery comprises the composite polymer electrolyte and its fabrication method comprises the steps of: inserting the composite polymer electrolyte between an anode and a cathode; inserting the resulting plate into a battery casing after laminating or rolling it; injecting an organic electrolyte solution into the battery casing; and sealing the casing.
Abstract:
본 발명은 리튬이차전지 및 그 제조방법을 제공한다. 보다 구체적으로는, 본 발명은 초극세 섬유상의 다공성 고분자 분리막을 포함하는 리튬이차전지 및 그 제조방법에 관한 것으로서, 상기 다공성 고분자 분리막은 a) 하나 이상의 고분자를 용융시키거나 또는 하나 이상의 고분자를 유기 용매에 용해시켜 용융 고분자 또는 고분자 용액을 얻는 단계, b) 상기 용융 고분자 또는 고분자 용액을 전하유도 방사장치 (electrospinning machine)의 배럴 (barrel)에 투입하는 단계, 및 c) 상기 용융 고분자 또는 고분자 용액을 기판 상에 노즐을 통하여 전하유도 방사시켜 다공성 분리막을 형성시키는 단계를 포함하는 방법에 의하여 제조된다. 본 발명의 리튬이차전지는 전극과의 접합성, 기계적 강도, 저온 및 고온 특성, 리튬이차전지용 유기 전해액과의 호환성이 우수하다.
Abstract:
PURPOSE: Provided are a lithium secondary battery comprising super fine fibrous porous polymer electrolyte and its preparation method. The lithium secondary battery has advantages of better adhesion with electrodes, good mechanical strength, better performance at low and high temperatures, better compatibility with organic electrolytes of a lithium secondary battery. CONSTITUTION: The lithium secondary battery comprises a cathode active material, an anode active material, a polymer electrolyte and an organic electrolyte solution dissolving a lithium salt, wherein the polymer electrolyte is constructed in the form of superfine fibers having a diameter of 1-3000nm. The polymer electrolyte is fabricated by the steps of: (a) dissolving at least one polymer with plasticizers and y organic electrolyte solvents to obtain at least one polymeric electrolyte solution; (b) adding the obtained polymeric electrolyte solution to a barrel of an electrospinning machine; and (c) electrospinning the polymeric electrolyte solution onto a substrate using a nozzle to form a polymer electrolyte film.
Abstract:
PURPOSE: Provided are a novel hybrid polymer electrolyte, a lithium secondary battery comprising the hybrid polymer electrolyte polymer and their fabrication methods. CONSTITUTION: The hybrid polymer electrolyte comprises superfine fibrous porous polymer matrix with particles having diameter of 1 - 3000 nm, polymers and lithium salt-dissolved organic electrolyte solutions incorporated into the porous polymer matrix. The hybrid polymer electrolyte has advantages of better adhesion with electrodes, good mechanical strength, better performance at low and high temperatures, better compatibility with organic electrolytes of a lithium secondary battery and it can be applied to the manufacture of lithium secondary batteries.
Abstract:
PURPOSE: A porous supporter for tissue engineering obtained from a copolymer of biodegradable glycolide/ε-caprolactone having excellent mechanical properties such as flexibility and elasticity and biodegradability is provided which can be effectively used as material for regenerating tissue of desired shapes. CONSTITUTION: This porous supporter is prepared from a biodegradable glycolide/ε -caprolactone copolymer having a recurring unit of formula 1 and a weight average molecular weight of 10,000. In formula, x and y are each 18 or more. The porous supporter has a pore size of 1 to 800 microns and a porosity of 50 to 99%.
Abstract:
PURPOSE: A star-shaped glycolide/epsilon-caprolactone co-polymer and a preparation method thereof are provided, which has a weight average molecular weight over 30,000 and a low melting viscosity. CONSTITUTION: A preparation method of star-shaped biodegradable glycolide/epsilon-caprolactone co-polymer of formula 1 comprises: in the presence of ring-opening polymerization catalyst of glycolide/epsilon-caprolactone, performing a ring-opening polymerization by heating glycolide and epsilon-caprolactone through using polyhydric alcohol as polymerization initiator under vacuum pressure. The polyhydric alcohol is selected from the group of glycerol, penta-erythritol, di-penta-erythritol, tri-penta-erythritol, sorbitol, poly-vinyl alcohol, poly-hydroxy ethyl methacrylate, and poly-hydroxy propyl methacrylate. The catalyst is selected from the group of tetra-phenyl tin, tin powder, stannous octoate, tin chloride, tin oxide, zinc powder, di-ethyl zinc octoate, zinc chloride, and zinc oxide.
Abstract:
본 발명은 신규한 하이브리드형 고분자 전해질, 이를 포함하는 리튬이차전지 및 이들의 제조방법을 제공한다. 보다 구체적으로는, 본 발명은 1-3000 nm의 직경을 갖는 입자로 이루어진 초극세 섬유상 다공성 고분자 매트릭스와, 상기 매트릭스 내에 함입되는 고분자 및 리튬염이 용해된 유기 전해액을 포함하는 하이브리드형 고분자 전해질을 제공한다. 상기 하이브리드형 고분자 전해질은 전극과의 접합성, 기계적 강도, 저온 및 고온특성 그리고 리튬이차전지용 유기 전해액과의 호환성이 우수하므로, 리튬이차전지의 제조에 응용될 수 있다.
Abstract:
본 발명은 리튬이차전지 및 그 제조방법을 제공한다. 보다 구체적으로는, 본 발명은 초극세 섬유상의 다공성 고분자 전해질을 포함하는 리튬이차전지 및 그 제조방법을 제공하는 것으로서, 상기 고분자 전해질은 a) 하나 이상의 고분자를 가소제 및 리튬염이 용해된 유기 전해액에 용해시켜 하나 이상의 고분자 전해질 용액을 얻고, b) 얻어진 고분자 용액을 전하유도 방사장치의 배럴에 투입한 후, c) 상기 고분자 전해질 용액을 기판 상에 노즐로 전하유도 방사하여 다공성 고분자 전해질 필름을 얻는 방법으로 제조된다. 본 발명의 리튬이차전지는 전극과의 접합성, 기계적 강도, 저온 및 고온특성 그리고 리튬이차전지용 유기 전해액과의 호환성이 우수하다는 장점을 갖는다.