Abstract: An electrode for a lithium secondary battery, including a surface having surface roughness of about 800 nm to about 1000 nm, and a lithium secondary battery including the same. In one embodiment, the lithium secondary battery has improved cycle-life characteristics.

Abstract: A fuel cell stack configured to alleviate pressure and decrease the flow rate of at least one of a fuel and an oxidant is disclosed. The fuel cell stack includes a membrane-electrode assembly, an anode separator, a cathode separator and a filing member. The membrane-electrode assembly may include an electrolyte membrane, an anode formed on a first surface of the electrolyte membrane, and a cathode formed on a second surface of the electrolyte membrane. The anode separator may include a fuel channel, a fuel inlet manifold in fluid communication with the fuel channel, and a fuel outlet manifold in fluid communication with the fuel channel. The cathode separator may include an oxidant channel, an oxidant inlet manifold in fluid communication with the oxidant channel, and an oxidant outlet manifold in fluid communication with the oxidant channel. The filling member may be positioned within at least one of the fuel inlet manifold and the oxidant inlet manifold.

Abstract: A membrane-electrode assembly for a fuel cell includes an anode and a cathode facing each other and a polymer electrolyte membrane interposed therebetween. At least one of the anode and the cathode includes a conductive electrode substrate and a catalyst layer formed thereon, and the catalyst layer includes a first catalyst layer including a first metal catalyst that grows from the polymer electrolyte membrane toward the electrode substrate and a second catalyst layer including a second metal catalyst covering the first catalyst layer.

Abstract: A catalyst layer composition for a fuel cell includes an ionomer cluster, a catalyst, and a solvent including water and polyhydric alcohol; and an electrode for a fuel cell includes a catalyst layer comprising an ionomer cluster having a three-dimensional reticular structure, and a catalyst, a method of preparing a electrode for a fuel cell includes a catalyst layer comprising an ionomer cluster having a three-dimensional reticular structure, and a catalyst, and a membrane-electrode assembly for a fuel cell including the electrode and a fuel cell system including the membrane-electrode assembly.

Abstract: Disclosed is a positive electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same. The positive electrode includes a current collector; a positive active material layer including a positive active material and a vanadium oxide; and a vanadium oxide-contained coating layer formed between the current collector and the positive active material layer.

Abstract: A non-aqueous electrolyte additive for a lithium secondary battery, a non-aqueous electrolyte, and a lithium secondary battery including the same, the additive including dicyanoacetylene or a cyano group-containing unsaturated compound represented by the following Chemical Formula 1, the cyano group-containing unsaturated compound including an unsaturated bond and two or more cyano groups linked in cis- or trans-positions of carbons of the unsaturated bond.

Abstract: A non-aqueous electrolyte additive for a lithium secondary battery, a non-aqueous electrolyte for a lithium secondary battery, and a lithium secondary battery, the additive including a bidentate phosphorus compound represented by the following Chemical Formula 1.

Abstract: A polymer represented by the following Formula 1, and a membrane-electrode assembly and a fuel cell system including the polymer: In the above Formula 1, definitions of the substituents are the same as in described in the detailed description.

Abstract: In one aspect, a rechargeable lithium battery comprising a non-aqueous electrolyte including an organic solvent; a lithium salt and a substituted 2-fluoroalkoxy-1,3,2-dioxaphospholane 2-oxide is provided. The 2-fluoroalkoxy-1,3,2-dioxaphospholane 2-oxide can be a compound represented by the following Chemical Formula 1.

Abstract: A membrane-electrode assembly for a fuel cell of the present invention includes: an anode and a cathode facing each other; and a polymer electrolyte membrane interposed between the anode and the cathode. The anode and the cathode or both include an electrode substrate and a catalyst layer. The catalyst layer includes a catalyst, a hydrophilic ionomer, and a hydrophobic binder.

Abstract: A membrane-electrode assembly for a fuel cell including an anode and a cathode disposed to face each other and a polymer electrolyte membrane disposed therebetween. The anode and the cathode include a conductive electrode substrate and a catalyst layer formed thereon. The catalyst layer includes ion conductive polymer particles and a catalytic metal. The resulting membrane-electrode assembly has an increased driving voltage.

Abstract: A fuel cell separator and a fuel cell system including the same. The separator includes a main body including a plurality of cell barriers and a flow channel disposed between the cell bathers, and a hydrophilic surface-treatment layer disposed on the bottom surface of the flow channel of the main body. The hydrophilic surface-treatment layer disposed on the bottom surface of the flow channel has a contact angle less than a contact angle of a side surface of at least one of the cell barriers by approximately 10° to approximately 60°.

Abstract: A membrane-electrode assembly for a fuel cell, the membrane-electrode assembly including an electrolyte membrane; an edge protective layer located at generally an edge of the electrolyte membrane; and a catalytic layer including a plate portion contacting the electrolyte membrane and a protruding portion protruding from the plate portion and contacting the edge protective layer.

Abstract: A fuel cell system having improved driving performance is disclosed. The fuel cell system includes a stack, which may include a membrane electrode assembly, a separator and end plates provided on the both sides of the stacked membrane electrode assembly and the separator. The membrane electrode assembly may include an anode electrode, a cathode electrode, and an electrolyte membrane. The separator may be positioned with respect to the anode electrode and the cathode electrode, respectively. The end plate may include an oxidant inlet configured to supply oxidant to the cathode electrode, an unreacted oxidant outlet configured to output the unreacted oxidant from the cathode electrode, and a absorption member in fluid communication between the oxidant inlet and the unreacted oxidant outlet.

Abstract: A stack for a fuel cell system, including: a membrane electrode assembly, a separator that includes a fuel passage that supplies a fuel to an anode electrode of the membrane electrode assembly and an oxidant passage that supplies an oxidant to a cathode electrode of an adjacent membrane electrode assembly, a first manifold that is formed by connecting first penetration holes that penetrate the separator in a stacking direction and that is connected to the fuel passage, a second manifold that is formed by connecting second penetration holes that penetrate the separator in the stacking direction and that is connected to the oxidant passage and a baffle that is disposed in at least one of the first manifold and the second manifold. The baffle has a membrane structure to control the fluid flow inside of the at least one of the first manifold and the second manifold.

Abstract: A fuel cell stack including membrane-electrode assemblies and separators formed between each of the membrane-electrode assemblies is disclosed. The membrane-electrode assemblies may each include an electrolyte membrane, an anode formed on a first surface of the electrolyte membrane, and a cathode formed on a second surface of the electrolyte membrane. Each of the separators may include an anode separator facing the anode and a cathode separator facing the cathode. Each of the separators may include at least two manifolds, a channel separated from the manifolds and facing either the anode or the cathode, and a connection channel fluidly connecting the manifold and the channel. The separator may also include a buffer protrusion system in the connection channel configured to disperse the flow of the fuel or the oxidant.

Abstract: A fuel cell stack including an electricity generating unit and a pair of end plates is disclosed. The electricity generating unit includes membrane-electrode assemblies and separators interposed between the membrane-electrode assemblies. The separators have recess portions formed on side faces thereof and may be configured to hold an external device for replacement of a single membrane-electrode assembly within the fuel cell stack. The end plates are located sandwiching the electricity generating unit by using fastening members to press the electricity generating unit.

Abstract: A fuel cell stack configured to alleviate pressure and decrease the flow rate of at least one of a fuel and an oxidant is disclosed. The fuel cell stack includes a membrane-electrode assembly, an anode separator, a cathode separator and a filing member. The membrane-electrode assembly may include an electrolyte membrane, an anode formed on a first surface of the electrolyte membrane, and a cathode formed on a second surface of the electrolyte membrane. The anode separator may include a fuel channel, a fuel inlet manifold in fluid communication with the fuel channel, and a fuel outlet manifold in fluid communication with the fuel channel. The cathode separator may include an oxidant channel, an oxidant inlet manifold in fluid communication with the oxidant channel, and an oxidant outlet manifold in fluid communication with the oxidant channel. The filling member may be positioned within at least one of the fuel inlet manifold and the oxidant inlet manifold.

Abstract: An electrode catalyst for a fuel cell including a carbon-based carrier and an active metal supported in the carrier, for example, an electrode catalyst for a fuel cell includes a carrier and an active metal supported in the carrier, wherein the electrode catalyst has an X value of 95 to 100% in Equation 1. X(%)=(XPS measurement value)/(TGA measurement value)×100??[Equation 1] wherein, the XPS measurement value represents a quantitative amount of the active metal present on a surface of the electrode catalyst, the TGA measurement value represents the XPS measurement value using a monochromated Al K?-ray, which is the quantitative amount of total active metal supported in the catalyst.

Abstract: A catalyst for a fuel cell including a carrier and an active metal dispersion that is supported in the carrier is disclosed. The catalyst may have a dispersity (Dp) represented by General Formula 1 and that ranges from between about 0.01 to about 1.0. Dispersity(Dp)={X?X10/(X1?B)}*(B/X)2??[General Formula 1] In the General Formula 1, X, X10, X1, and B are defined the same as described in the specification. A membrane-electrode assembly, and a fuel cell system having the catalyst are also disclosed.