Abstract:
The present invention relates to a method for preparing hydrogen using solid acid mixture, and more specifically, by providing a hydrogen preparing method comprising: (a) a solid acid mixture insertion step mixing a carbon body with solid acid mixture so as to prepare solid acid mixture and putting the prepared solid acid mixture into a reactor; (b) a raw material mixture insertion step which inserts raw mixture composed of methane/alcohol/water vaporized in the reactor; (c) a hydrogen generation step which the inserted solid acid mixture acts as a catalyst to the raw material mixture so as to break down the raw material mixture and generates hydrogen as a result of the break down reaction; and (d) a hydrogen discharging step which discharges the generated hydrogen to the outside of the reactor, a hydrogen preparing method which significantly improves economic efficiency and operation stability is provided.
Abstract:
Disclosed is a vacuum double-tube spacer for a cryogenic liquid transfer line arranged between an inner tube in which cryogenic liquid flows and an outer tube which surrounds the inner tube from outside for maintaining the vacuum state between the inner and outer tubes. The spacer is formed of a plate on which multiple outer contact points coming in point-contact with the inner surface of the outer tube are arranged. Also, the spacer has multiple conical inner contact points protruding from the inner surface of a through-hole through which the inner tube penetrates, and coming in contact with the outer surface of the inner tube.
Abstract:
The present invention relates to a method for manufacturing an air electrode for a lithium-air battery having a high capacity and excellent cycle characteristics, and a lithium-air battery using the same. More particularly, the present invention can improve homogeneity on the surface of an electrode due to active materials uniformly dispersed not only on the surface of a current collector but also on a frame inside, by coating electrode active material slurry including carbon or carbon, a catalyst and a binder on the current collector of an air electrode via a spray coating method. Therefore, the present invention improves the characteristics of a lithium-air battery and provides an air electrode having the characteristics of a secondary battery and a lithium-air battery including the same, as a cathode. [Reference numerals] (AA) Comparative example 2; (BB) Comparative example 1; (CC) Example 1
Abstract:
세리아 또는 금속 도핑된 세리아 및 리튬 염, 나아가 산화 비스무스로 이루어지는 세리아계 조성물, 세리아계 복합 전해질 분말 및 이를 이용한 소결 방법 및 소결체가 제공된다. 일예로서 상기 리튬 염은 세리아계 조성물에 대하여 0 중량% 초과 5 중량% 이하로, 산화 비스무스는 0 중량% 초과 10 중량% 이하로 포함된다. 세리아계 물질에 저융점 및/또는 휘발성의 화합물들을 첨가함으로써, 소결 온도를 낮출 수 있으며, 세리아계 단독으로 사용하는 경우의 기존 소결 온도인 1500℃ 보다 훨씬 낮은 저온 예컨대 1000℃ 이하에서도 높은 복합체 소결 밀도 예컨대 95% 이상의 소결 밀도를 확보할 수 있다.
Abstract:
PURPOSE: An electrode is provided to have excellent ion conductivity and electric conductivity because a metal-doped carbon thin film covers the interface of an electrode active material in contact with an electrolyte. CONSTITUTION: An electrode is coated with a metal-doped carbon thin film. The electrode comprises an electrode active material, a conductor, and a binder. The electrode active material is LiCoO2, LiMn2O4, LiNiO2, LiNiCoO2, V6O13, V2O5 or MnO2. The conductor is acetylene black, carbon black, graphite or a mixture thereof. The binder is a vinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride, polyacrylonitrile, polymethylmethacrylate, polyamide or a mixture thereof.
Abstract:
PURPOSE: Polybenzimidazolium is provided to provide a polymer electrolyte with excellent performance and stability. CONSTITUTION: Polybenzimidazolium has a structure indicated in chemical formula 1 or chemical formula 2. In the chemical formulas, A is a direct bond or oxygen, B is a diacid group having 1-5 heteroatoms or diacid group containing nine or more carbon atoms, each of R1-R4 is independently hydrogen, a C1-6 alkyl group or aromatic substituent group, X- is anion selected from halogen, OH-, carbonate, hydrogen carbonate, sulfate, acetate, formate, methanolate and ethnolate, and n is an integer from 1 or more. [Reference numerals] (AA) R1 or unsubstituted; (BB, EE) R3 or unsubstituted; (CC) R2 or unsubstituted; (DD, FF) R4 or unsubsituted
Abstract:
고분자 전해질 연료전지의 운전 시 시동 단계에서 공기보다 연료 가스를 먼저 주입하도록 하면, 고분자 전해질 연료전지의 셀 성능 및 전기화학적 표면적 감소 속도를 늦출 수 있고, 시동과 정지가 반복되는 운전에 있어서 전하 전달 저항 증가 속도를 늦출 수 있다. 이는 고분자 전해질 연료전지의 성능 저하를 완화함으로써 결과적으로 내구성을 향상시키는 것이다. 이에 따르면 고분자 전해질 연료전지의 상용화 특히 전기 자동차의 동력원으로의 상용화에 기여할 수 있다. 고분자 전해질 연료전지, 수소 주입, 공기 주입, 시동, 내구성