Abstract: It is an object to provide a positive electrode for nonaqueous electrolyte secondary batteries in which a decrease in the initial charge capacity is suppressed even when a positive electrode active material exposed to the air is used. The positive electrode for a nonaqueous electrolyte secondary battery contains a lithium transition metal oxide and is formed by mixing the lithium transition metal oxide, tungsten oxide, and a carbonate compound. The tungsten oxide is present on at least a part of a surface of the lithium transition metal oxide, and the mixed carbonate compound is present on a part of a surface of the tungsten oxide.

Abstract: It is an object to provide a positive electrode for nonaqueous electrolyte secondary batteries in which a decrease in the initial charge capacity is suppressed even when a positive electrode active material exposed to the air is used. The positive electrode for a nonaqueous electrolyte secondary battery contains a lithium transition metal oxide and is formed by mixing the lithium transition metal oxide, tungsten oxide, and a carbonate compound. The tungsten oxide is present on at least a part of a surface of the lithium transition metal oxide, and the mixed carbonate compound is present on a part of a surface of the tungsten oxide.

Abstract: A fuel tank comprises: multiple pellets each formed of a hydrogen storage metal which is capable of storing hydrogen to be supplied to fuel cells; a support mechanism configured to support the multiple pellets such that they are layered mutually closest to one another while still permitting the volume of the multiple pellets to change; a housing unit configured to house the multiple pellets in a layered state which is maintained by the support mechanism; and a detection unit configured to detect the positions of both ends of the multiple pellets which change due to changes in the volume of the multiple pellets.

Abstract: A fuel cell system includes (1) a fuel containing unit having two containers containing a metal hydride, the two containers being disposed in thermal contact with each other, (2) a fuel cell disposed in thermal contact with one of the two containers, (3) a discharge regulating valve capable of switching between a suppressed state in which hydrogen discharge from the other of the two containers is suppressed and an open state in which the suppressed state is canceled, and (4) a control unit for controlling the discharge regulating valve so that the suppressed state is set when the temperature inside the other container is less than a predetermined temperature and the open state is set when the temperature inside the other container is greater than or equal to the predetermined temperature.

Abstract: Corrosion of a metal portion such as a pipe connected to a fuel cell stack is suppressed. The fuel cell stack has a plurality of single cells which generate electrical power using an aqueous methanol solution and air and are stacked in a vertical direction. An inlet of a fuel supply manifold for distributing the aqueous methanol solution to each cell and an outlet of a fuel discharge manifold for collecting the fuel discharged from the single cells are provided in a common conductive end plate. Hence, when the discharge fuel discharged from the fuel cell stack is circulated and resupplied to the stack, the potential of the discharged fuel becomes equal to that of the liquid fuel to be supplied to the stack, whereby the corrosion of the metal portion such as a pipe, a tank, a pump, or a heat exchanger is suppressed.

Abstract: A fuel cell system includes a fuel cell, a fuel tank, a first passage which supplies liquid fuel from the fuel tank to the fuel cell, a cartridge holder in which a plurality of types of cartridges are replaceably loaded, a second passage which supplies the content discharged from the cartridge to the fuel cell, a cartridge detector which detects the type of cartridge loaded in the cartridge holder, and a passage control means which controls the passages in accordance with the type of cartridge detected.

Abstract: A direct liquid fuel cell is provided, which can prevent a gas such as carbon dioxide generated by an anode of the fuel cell from adhering to an electrode. A DMFC that is a direct liquid fuel cell includes: an electrolyte membrane; an anode electrode provided on a surface of the electrolyte membrane; a cathode electrode provided on another surface of the electrolyte membrane; and a methanol fuel storage portion, provided to be adjacent to the anode electrode, for supplying a liquid fuel to the anode electrode. In the DMFC, the methanol fuel storage portion contains a solid particle.

Abstract: A fuel cell system includes a fuel cell, a fuel tank, a first passage which supplies liquid fuel from the fuel tank to the fuel cell, a cartridge holder in which a plurality of types of cartridges are replaceably loaded, a second passage which supplies the content discharged from the cartridge to the fuel cell, a cartridge detector which detects the type of cartridge loaded in the cartridge holder, and a passage control means which controls the passages in accordance with the type of cartridge detected.

Abstract: Corrosion of a metal portion such as a pipe connected to a fuel cell stack is suppressed. The fuel cell stack has a plurality of single cells which generate electrical power using an aqueous methanol solution and air and are stacked in a vertical direction. An inlet of a fuel supply manifold for distributing the aqueous methanol solution to each cell and an outlet of a fuel discharge manifold for collecting the fuel discharged from the single cells are provided in a common conductive end plate. Hence, when the discharge fuel discharged from the fuel cell stack is circulated and resupplied to the stack, the potential of the discharged fuel becomes equal to that of the liquid fuel to be supplied to the stack, whereby the corrosion of the metal portion such as a pipe, a tank, a pump, or a heat exchanger is suppressed.

Abstract: A fuel cell system includes: a fuel cell main body having a fuel cell; a fuel storage portion coupled attachably and detachably to the fuel cell main body for storing fuel to be supplied to the fuel cell; and a coupling portion which couples between the fuel cell main body and the fuel storage portion. In the system, a fuel having a concentration lower than that of a fuel stored in the fuel storage portion is allowed to flow through the coupling portion.

Abstract: A direct liquid fuel cell is provided, which can prevent a gas such as carbon dioxide generated by an anode of the fuel cell from adhering to an electrode. A DMFC that is a direct liquid fuel cell includes: an electrolyte membrane; an anode electrode provided on a surface of the electrolyte membrane; a cathode electrode provided on another surface of the electrolyte membrane; and a methanol fuel storage portion, provided to be adjacent to the anode electrode, for supplying a liquid fuel to the anode electrode. In the DMFC, the methanol fuel storage portion contains a solid particle.

Abstract: A fuel cell system and a cleaning system provided with the function of cleaning cordlessly are provided. The fuel cell system includes a fuel cell which generates electric power by using liquid fuel and a cleaning apparatus which cleans a target of cleaning by using the liquid fuel. A cleaning system includes: a fuel cell which generates electric power by using liquid fuel; and a cleaning apparatus which cleans using the liquid fuel.

Abstract: A DMFC system which realizes appropriate temperature management on a methanol aqueous solution and on a DMFC with consideration given to the activity of methanol oxidation reaction between electrodes and suppression of degradation of solid polymer films. The fuel cell system according to the present invention comprises: a fuel cell which generates electric power by using liquid fuel; a fuel feed unit which feeds the liquid fuel to the fuel cell; an emission recovery unit which recovers emissions from the fuel cell; and a heat medium feed unit which feeds a heat medium for cooling the emissions to the emission recovery unit. Here, the heat medium cools the fuel cell.