Abstract: A fuel cell system for supplying electricity to a load system, the fuel cell system comprising a fuel cell unit generating electricity from air and fuel, a power supply unit supplying the load system with electricity, the power supply unit being charged with the electricity generated from the fuel cell unit in a selective manner, a control unit monitoring a charge condition of the power supply unit and operating the fuel cell unit in order to charge the power supply unit when the power supply unit is discharged to a predetermined level or lower and an output unit supplying the electricity output from the power supply unit to the load system.

Abstract: An electrode substrate for a fuel cell including a diffusion layer, a first microporous layer that embeds into the diffusion layer, with the first microporous layer having a thickness in the range of 10 to 30 ?m, and a second microporous layer that forms a boundary with the diffusion layer on the surface of the first microporous layer. The electrode substrate has improved performance such as increased diffusion properties of a fuel or an oxidant, increased properties of releasing moisture, and enhanced electron conductivity.

Abstract: A fuel cell stack includes a first separator and a second separator, each separator having raised portions and channel portions on a first side and a second side, the channel portions on the first side being opposite the raised portions on the second side and the channel portions on the second side being opposite the raised portions on the first side. The stack also includes a membrane-electrode assembly located between the first separator and the second separator, and closely contacting the raised portions of the first side of the first separator and the raised portions of the second side of the second separator.

Abstract: A fuel cell system includes a stack for generating electrical energy through electrochemical reaction between a fuel and oxygen and supplying the electrical energy to a load, a fuel supply unit for supplying the fuel to the stack, an oxygen supply unit for supplying the oxygen to the stack, and a comparator coupled to the stack to compare an electricity output value of the stack with a reference electricity output value corresponding to the load and to selectively electrically connect the stack to the load according to the electricity output value.

Abstract: The invention relates to an electrode for a fuel cell and a fuel cell comprising the same. The electrode includes a catalyst layer formed on a diffusion layer comprising conductive powders, fluorinated resins, and conductive substrates.

Abstract: The metal separator for a fuel cell of the present invention includes a metal substrate having reactant flow pathways and an electro-conductive anti-corrosion coating layer. The electro-conductive anti-corrosion coating layer covers the surface of the metal substrate on which the reactant flow pathways are formed. The coating layer may include metal carbides, metal oxides, and metal borides. A metal layer for improving adherence is formed between the surface of the metal substrate on which the reactant flow pathways are formed, and the electro-conductive anti-corrosion coating layer.

Abstract: An electrode for a fuel cell of the present invention includes an electrode substrate, a microporous layer formed on the surface of the electrode substrate, and a nano-carbon layer formed on the surface of the microporous layer with a catalyst layer coated on the surface of the nano-carbon layer. Alternatively, an electrode for a fuel cell includes an electrode substrate in which carbon particles are dispersed, a nano-carbon layer on the electrode substrate, and a catalyst layer on the nano-carbon layer.

Abstract: A metal separator for a fuel cell of the present invention includes a metal substrate having a reactant flow pathway, and a metal nitride coating layer. The metal nitride coating layer covers the surface of the metal substrate on which a reactant flow pathway is formed and slurry-coated. A metal layer for improving adherence is formed between the surface of the metal substrate on which a reactant flow pathway is formed, and the electro-conductive metal nitride coating layer. The metal separator is suitable for a fuel cell since it is lightweight, and has excellent anti-corrosion and electric conductivity.

Abstract: The electrode for a fuel cell of the present invention includes a catalyst layer and an electrode substrate supporting the catalyst layer, where the electrode substrate includes a hydrophilic region and a hydrophobic region separated from each other. The hydrophilic region and the hydrophobic region that are separated from each other can easily release water produced at the cathode, and thereby prevent clogging of pores of the membrane by water, and smoothly diffuse the reactants resulting in obtaining a high current density.

Abstract: A fuel cell system including: at least one electricity generator for generating electric energy through a reaction between fuel and oxygen and for discharging the remaining fuel; a fuel supply unit for supplying a predetermined amount of fuel to the electricity generator; an oxygen supply unit for supplying oxygen to the electricity generator; a valve unit which is connected to a fuel discharger of the electricity generator and which adjusts a fuel pressure in the electricity generator; a sensor unit which is disposed in the electricity generator and which senses an output amount of electricity of the electricity generator; and a control unit which converts a sensed signal from the sensor unit into a predetermined control signal and which controls the valve unit with the predetermined control signal.

Abstract: A reformer for a fuel cell system, a fabrication method thereof, and a fuel cell system are provided. The reformer includes a plurality of reaction substrates. The reaction substrates each have a reaction substrate body provided with a flow channel with micropores formed on the surface of the flow channel. In addition, a catalyst layer may be formed within the flow channel of the reaction substrate body. Since the reformer for a fuel cell system suggested in the present invention includes reaction substrates having micropores formed in the flow channel, it has a high specific surface area and high catalyst activity. Moreover, since the catalyst layer is formed by a deposition method, the reformer can be of a small proportion, occupying little space in the fuel cell system.

Abstract: The electrode for a fuel cell of the invention includes: an electrode substrate; and a catalyst layer having a filler layer formed on the surface of the electrode substrate and a catalyst coating the filler layer.

Abstract: A reformer for a fuel cell system, a fabrication method thereof, and a fuel cell system are provided. The reformer includes a plurality of reaction substrates. The reaction substrates each have a reaction substrate body provided with a flow channel with micropores formed on the surface of the flow channel. In addition, a catalyst layer may be formed within the flow channel of the reaction substrate body. Since the reformer for a fuel cell system suggested in the present invention includes reaction substrates having micropores formed in the flow channel, it has a high specific surface area and high catalyst activity. Moreover, since the catalyst layer is formed by a deposition method, the reformer can be of a small proportion, occupying little space in the fuel cell system.

Abstract: A fuel cell system that includes a stack includes a plurality of generators for producing electrical energy by an electrochemical reaction of hydrogen and oxygen. The generators are connected in series. In addition, the fuel cell system comprises a fuel supply assembly for supplying fuel comprising hydrogen to the generators, an oxygen supply assembly for supplying oxygen to the generators and at least one branch member that is coupled to at least one of the generators.

Abstract: Provided is a cathode electrode including a current collector, and a cathode electrode active material layer laminated on the current collector, a method of making the cathode electrode, and a battery including the cathode electrode. The cathode electrode active material includes particles having a core-shell structure with a sulfur-containing active material core, a conductor coating disposed on a surface of the active material core, and a binder coating disposed on the conductor coating. A high-performance lithium sulfur battery can be manufactured using the cathode electrode, since sufficient bondability can be attained with only a small amount of a binder.

Abstract: Disclosed is a rechargeable lithium ion battery including a positive electrode comprising a first current collector and a positive active material layer on the first current collector; a negative electrode comprising a second current collector and a negative active material layer on the second current collector; and an electrolyte comprising a non-aqueous organic solvent and a lithium salt. At least one of the first and the second current collectors includes a rigid polymer film with a metal deposited on the rigid polymer film.

Abstract: A negative electrode of a lithium secondary battery, a method of fabricating the same, and a lithium secondary battery including the same utilize, in the negative electrode, a negative active material layer and a lithium ion conductive layer formed on the negative active material layer, wherein the lithium ion conductive layer includes a compound represented by the following Formula 1: LixCOy??(1) wherein 1<x<3, and 2<y<4.

Abstract: A negative electrode of a lithium battery includes a lithium metal and a protective layer that includes a material having an ion conductivity of at least 5×10−5 S/cm. The protective layer includes ion conductive material that has a dense internal structure and an effective adhesive strength to the lithium metal. Although the protective layer has a thickness in the order of micrometers, the protective layer does not cause resistance to the electrochemical reaction and is chemically stable with respect to both the lithium metal and the electrolyte.

Abstract: Disclosed is a negative electrode for a lithium sulfur battery. The negative electrode includes a lithium metal, a pre-treatment layer, and a protection layer for the lithium metal. The pre-treatment layer has a thickness of 50 to 5000 Å and includes a lithium ion conductive material with an ionic conductivity of at least 1×10−10 S/cm.

Abstract: Provided are a separator having an inorganic protective film and a lithium battery using the separator. The separator has suppressed self discharge and reduced internal shorting.