In order to provide a separator for fuel cells, or a current collecting member for fuel cells, which has low contact resistance, excellent corrosion resistance and which can be economically manufactured, and a manufacturing method thereof, this separator for fuel cells comprises a substrate having iron or aluminum as the main component, a gas barrier film formed directly on said substrate and having excellent corrosion resistance, and a conductive resin film formed on the gas barrier film and containing a conductive ceramics or graphite particles having a particle diameter of 1-20 μm.

In order to provide a separator for fuel cells, or a current collecting member for fuel cells, which has low contact resistance, excellent corrosion resistance and which can be economically manufactured, and a manufacturing method thereof, this separator for fuel cells comprises a substrate having iron or aluminum as the main component, a gas barrier film formed directly on said substrate and having excellent corrosion resistance, and a conductive resin film formed on the gas barrier film and containing a conductive ceramics or graphite particles having a particle diameter of 1-20 μm.

A lithium battery and method for fabricating the same are provided herein. The battery cathode comprises a carbon structure filled with a catalyst, such as palladium-catalyst-filled carbon nanotubes (CNTs). The carbon structure provides a barrier between the catalyst and the electrolyte providing an increased stability of the electrolyte during both discharging and charging of a battery.

A fuel cell stack includes: a first fuel cell and a second fuel cell, each of which has a structure in which a solid oxide electrolyte layer having oxygen ion conductivity is provided between two electrode layers; and an interconnector that is provided between the first fuel cell and the second fuel cell and has a separator made of a metal material, wherein the interconnector has a first metal porous part and a first gas passage on a first face of the separator on a side of the first fuel cell, wherein the interconnector has a second metal porous part and a second gas passage on a second face of the separator on a side of the second fuel cell.

There is provided a metal member capable of effectively preventing a coating layer from peeling off from a base. The metal member in an embodiment is a metal member that is used in a solid-oxide type electrochemical stack, and includes: a base formed of ferritic stainless steel; and a metal film provided on the base, in which the metal film includes a first metal layer containing Co and a second metal layer made of Mn, and is a stack in which the first metal layer and the second metal layer are sequentially stacked from the side of the base.

There is provided a metal member capable of effectively preventing a coating layer from peeling off from a base. The metal member in an embodiment is a metal member that is used in a solid-oxide type electrochemical stack, and includes: a base formed of ferritic stainless steel; and a metal film provided on the base, in which the metal film includes a first metal layer containing Co and a second metal layer made of Mn, and is a stack in which the first metal layer and the second metal layer are sequentially stacked from the side of the base.

Disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance. More particularly, disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance in a sulfuric acid environment which is a fuel cell operating environment. According to an embodiment, the stainless steel for a separator of a polymer fuel cell includes, in percent by weight (wt %), 0.09% or less of C, 1.0% or more and less than 2.5% of Si, 1.0% or less (excluding 0) of Mn, 0.003% or less of S, 20 to 23% of Cr, 9 to 13% of Ni, 1.0% or less (excluding 0) of W, 0.10 to 0.25% of N, and the remainder of Fe and other inevitable impurities, wherein a corrosion resistance index represented by Formula (1) below is 7 or more.

3*W+1.5*Si+0.1*Cr+20*N−2*Mn  (1)

In Formula (1), W, Si, Cr, N, and Mn represent the content (wt %) of each element.

Disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance. More particularly, disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance in a sulfuric acid environment which is a fuel cell operating environment. According to an embodiment, the stainless steel for a separator of a polymer fuel cell includes, in percent by weight (wt %), 0.09% or less of C, 1.0% or more and less than 2.5% of Si, 1.0% or less (excluding 0) of Mn, 0.003% or less of S, 20 to 23% of Cr, 9 to 13% of Ni, 1.0% or less (excluding 0) of W, 0.10 to 0.25% of N, and the remainder of Fe and other inevitable impurities, wherein a corrosion resistance index represented by Formula (1) below is 7 or more.

3*W+1.5*Si+0.1*Cr+20*N−2*Mn  (1)

In Formula (1), W, Si, Cr, N, and Mn represent the content (wt %) of each element.

Fuel cell alloy bipolar plates. The alloys may be used as a coating or bulk material. The alloys and metallic glasses may be particularly suitable for proton-exchange membrane fuel cells because of they may exhibit reduced weights and/or better corrosion resistance. The alloys may include any of the following Al.sub.xCu.sub.yTi.sub.z, Al.sub.xFe.sub.yNi.sub.z, Al.sub.xMn.sub.yNi.sub.z, Al.sub.xNi.sub.yTi.sub.z, Cu.sub.xFe.sub.yTi.sub.z, Cu.sub.xNi.sub.yTi.sub.z, Al.sub.xFe.sub.ySi.sub.z, Al.sub.xMn.sub.ySi.sub.z, Al.sub.xNi.sub.ySi.sub.z, Ni.sub.xSi.sub.yTi.sub.z, and C.sub.xFe.sub.ySi.sub.z. The alloys or metallic glass may be doped with various dopants to improve glass forming ability, mechanical strength, ductility, electrical or thermal conductivities, hydrophobicity, and/or corrosion resistance.

Fuel cell alloy bipolar plates. The alloys may be used as a coating or bulk material. The alloys and metallic glasses may be particularly suitable for proton-exchange membrane fuel cells because of they may exhibit reduced weights and/or better corrosion resistance. The alloys may include any of the following Al.sub.xCu.sub.yTi.sub.z, Al.sub.xFe.sub.yNi.sub.z, Al.sub.xMn.sub.yNi.sub.z, Al.sub.xNi.sub.yTi.sub.z, Cu.sub.xFe.sub.yTi.sub.z, Cu.sub.xNi.sub.yTi.sub.z, Al.sub.xFe.sub.ySi.sub.z, Al.sub.xMn.sub.ySi.sub.z, Al.sub.xNi.sub.ySi.sub.z, Ni.sub.xSi.sub.yTi.sub.z, and C.sub.xFe.sub.ySi.sub.z. The alloys or metallic glass may be doped with various dopants to improve glass forming ability, mechanical strength, ductility, electrical or thermal conductivities, hydrophobicity, and/or corrosion resistance.