Abstract:
본 발명의 여러 구현예에 따르면, 마그네슘 이차전지용 음극 포일은 마그네슘 이차전지용 전해질 용액에서의 화학적, 전기화학적 안정성과 전기전도도가 우수하고, 두께가 얇아 전지의 무게당 및 부피당 에너지밀도가 높고 가격이 저렴하므로, 마그네슘 이차전지용 음극으로 사용하는 경우, 마그네슘 이차전지의 전기화학적 안정성, 전극용량 및 사이클 특성을 향상시키는 효과가 있으므로 향후 마그네슘 이차전지의 상용화에 기여할 수 있을 것으로 기대된다.
Abstract:
본 발명은 마그네슘 공기전지용 공기양극 및 이의 제조방법에 관한 것이다. 본 발명의 여러 구현예에 따르면, 4층 구조로 형성되어 있는 마그네슘 공기전지용 공기양극은 전해질 용액의 외부로의 유출을 방지할 뿐만 아니라, 전해질 용액이 모세관 현상으로 젖게 하여 삼상계면을 많이 형성함으로써 반응속도를 높이고, 전해질 용액이 흐르지 않도록 하고, 반응 생성물인 수산화마그네슘의 공기전극에의 부착을 방지함으로써 반응속도를 증가시켰으며, 내구성이 향상된 효과를 달성할 수 있다.
Abstract:
A separation method of zirconium and hafnium by an embodiment of the present invention comprises the following steps: a mixing step for mixing a sulfuric acid aqueous solution containing zirconium and hafnium, a catalyst, and an acidic extractant to obtain extraction liquid; and a first extraction step for stirring the extraction liquid to form a first extract layer containing the acidic extractant with the hafnium, and a sulfuric acid aqueous solution layer forming a separate layer from the first extract layer. The present invention remarkably improves the separation efficiency of the zirconium and hafnium by reducing the usage amount of the extractant, and effectively separates the zirconium and hafnium in an environmentally friendly way without using a toxic compound like cyan.
Abstract:
PURPOSE: An apparatus for mixing fuel is provided to improve the mixing efficiency of fuel, thereby uniformizing the concentration of fuel, and to minimize the amount of liquid fuel included in a gas product which is being discharged to outside. CONSTITUTION: A separator(31) is mounted on a fuel mixing apparatus(2) which provides fuel for an electrochemical reaction device(3), divides the inner space of the fuel mixing apparatus, guides flow of fluid, and has a separate partition protruded from the separator. Raw fuel liquid is supplied to the fuel mixing apparatus, un-reacted fuel(B) leaked from an anode of the electrochemical reaction device is supplied to the fuel mixing apparatus. Water generated from a cathode of the electrochemical reaction device is collected and supplied to the fuel mixing apparatus, as condensed water(W).
Abstract:
PURPOSE: A method for recovering lithium from a phosphorus oxide cathode active material of a lithium battery is provided to minimize environmental pollution compared to the conventional method using inorganic acid, such as sulfate. CONSTITUTION: A method for recovering lithium from a phosphorus oxide cathode active material of a lithium battery comprises the steps of: dissolving a phosphorus oxide cathode active material of a lithium battery, including LiFePO4, and iron powder in a phosphoric acid aqueous solution in order to obtain a LiFePO4-dissolved solution; adding caustic soda to the LiFePO4-dissolved solution in order to deposit and remove iron and impurities; mixing the LiFePO4-dissolved solution with ethanol in order to deposit and separate lithium into lithium phosphate; and washing the lithium phosphate with ethanol in order to obtain lithium phosphate without impurities.
Abstract:
본 발명은 폐리튬전지 양극활물질로부터 코발트를 선택적으로 용출하여 분리추출하는 방법에 관한 것으로서, 상세하게는 본 발명은 암모니아수를 용출액으로 사용하고 환원제인 히드라진하이드레이트를 소량 첨가하여 코발트를 용출시키는 것을 특징으로 하는 리튬전지 양극활물질로부터 코발트의 분리회수방법에 관한 것이다. 본 발명의 방법에 의할 경우 종래 무기산에 의한 용출 공정이나 암모니아수에 의한 고압 용출 공정에 비해 코발트 만의 선택적 용출이 가능하며, 또한 용출액으로부터 코발트를 분리하기 위한 복잡한 후공정이 별도로 요구되지 않으며, 무기산을 사용하는 종래 공정에 비해 주변환경오염을 최소화할 수 있어 경제적이면서도 친환경적으로 코발트를 분리할 수 있다. 폐리튬전지, 양극활물질, 코발트, 분리회수
Abstract:
A method for the separation and extraction of cobalt from a cathode active material for a lithium secondary battery is provided to accomplish selective dissolution of cobalt while avoiding a need for post-treatment, to obtain a high recovery ratio of at least 96%, and to prevent environmental pollution. A method for the separation and extraction of cobalt from a cathode active material for a lithium secondary battery comprises a step of carrying out selective dissolution of cobalt from the cathode active material of a waste lithium battery by using aqueous ammonia as an eluant, and by adding hydrazine hydrate as a reducing agent. Aqueous ammonia is added in an amount of 5-20 ml of concentrated aqueous ammonia(28% aqueous ammonia based on NH3) per gram of the cathode active material. Hydrazine hydrate is added in an amount of 0.1-0.5 ml per gram of the cathode active material.