Various embodiments include a method for producing a gas diffusion electrode, the method comprising: providing a raw electrode layer comprising an electrically non-conducting web; adapting a thickness of the raw electrode layer; and applying a non-solvent to the raw electrode layer.

A method and a device for producing bipolar plates for fuel cells. A bipolar plate is formed by joining an anode plate to a cathode plate, wherein the anode plate and the cathode plate are formed by forming a substrate plate.

In order to provide a cost-effective and automated method, it is proposed that a plate already provided with a reactive coating or catalyst coating, which is transported, automatically driven, via a transport device from the forming device to the joining device, is used as substrate plate.

A metal plate is formed by stacking a plurality of thin metal plates. The thin metal plates are respectively provided with a plurality of through holes passing therethrough in the thickness direction. The metal plate is provided with penetration spaces 1c formed by the through holes of the plurality of thin metal plates that are in communication with each other in a state in which thin metal plates are stacked. A metal plate aspect ratio that is a value obtained by dividing the thickness of each of the thin metal plates by the inner diameter of the through holes is 2 or less. A metal support aspect ratio that is a value obtained by dividing the overall thickness of the metal plate by the minimum inner diameter of the penetration spaces is 3 or more.

A method for producing an air electrode includes a kneading step of kneading an oxygen reduction catalyst, a conductive auxiliary agent, and a water-repellent resin (binder) in a water solvent; and a rolling step of rolling with a roller the kneaded product produced in the kneading step. The rolling step includes rolling the kneaded product with the roller several times in many directions (at least two or more different rolling directions). In the formed air electrode, the water-repellent resin is fiberized in the air electrode, and the fibers thereof are oriented in many directions to form a netlike shape.

Systems and methods for a battery electrode having a solvent level to facilitate peeling are disclosed. In examples, a battery may include one or more electrodes and an electrolyte. The electrodes include an electrode slurry layer with a solvent. The electrode slurry is coated on a substrate, where the electrode slurry and substrate produce an active material with a residual amount of solvent in response to a heat-treatment, and where the active material comprises 10% to 25% residual solvent by weight following the heat-treatment. The amount of residual solvent facilitates peeling of the active material from the substrate, which, once pyrolyzed, may be used to create a multi-layer film with the current collector film and the active material.

A method for manufacturing a membrane electrode and gas diffusion layer assembly includes: applying a catalyst ink including an ionomer to a second surface of an electrolyte membrane while conveying a first sheet in which a first surface of the electrolyte membrane is supported by a back sheet; drying the catalyst ink by blowing air vibrated with ultrasonic waves onto a surface of the catalyst ink to produce a second sheet in which a catalyst layer is provided on the second surface of the electrolyte membrane; forming a first roll by winding the second sheet; and producing a third sheet by stacking a gas diffusion layer on the catalyst layer and pressing them in a stacking direction as heating to join the catalyst layer and the gas diffusion layer while conveying the second sheet unwound from the first roll.

A membrane electrode assembly manufacturing device includes a loading apparatus for supplying an MEA roll on which a membrane electrode assembly is arranged by a predetermined pitch, a hot press apparatus for pressing a surface corresponding to the membrane electrode assembly of the MEA roll at a set temperature, a buffer apparatus to which the MEA roll is supplied to one side and exhausted at the other side, and for performing a buffer function of absorbing a difference between supply and exhaustion, and a cutting apparatus for cutting a portion of the membrane electrode assembly arranged at the MEA roll.

A membrane electrode assembly includes an electrolyte membrane stacked between different electrodes, wherein an ionomer layer of the electrolyte membrane comprises an adjacent electrode, a first layer having at least a same cross-sectional area as that of the adjacent electrode, a reinforcing layer and a second layer stacked at a side of the first layer, the second layer having at least the same cross-sectional area as that of the reinforcing layer.

An object of the present invention is to provide an electrode which is used for a liquid flow-through device and in which liquid flow-through resistance is reduced and the utilization efficiency of the surface of carbon fiber is enhanced. Another object of the present invention is to provide a redox flow battery having excellent charge-discharge performance by use of the electrode which is used for the liquid flow-through device. The present invention provides an electrode to be used for a liquid flow-through device, the electrode including a plurality of sheets of carbon fiber nonwoven fabric each having irregularities on a surface of the sheet of carbon fiber nonwoven fabric being stacked or each having a through-hole on the carbon fiber sheet being stacked, and having inside of the electrode a plurality of gaps which is formed by recesses of the irregularities or the through-hole and is not opened in a thickness direction.

Disclosed are a polymer electrolyte membrane for fuel cells which has improved handling properties and mechanical strength by employing symmetric-type laminated composite films and a method for manufacturing the same.