Showa Denko K.k.

Gaku Oriji

Hisayuki Miki

Kenzo Hanawa

Koji Kamei

Isao Kabe

Akihisa Tonegawa

Masatoshi Ichikawa

Keizo Iseki

Akihiko Shirakawa

Eiji Kambara

Akihiro Matsuse

Irwansyah

A redox flow electrode according to one aspect of the present invention is a redox flow battery electrode disposed between an ion exchange membrane and a bipolar plate, wherein the electrode includes a conductive sheet containing carbon nanotubes having an average fiber diameter of 1 &#x3bc;m or less, and a porous sheet that is laminated to the conductive sheet and is formed from fibers having an average fiber diameter of greater than 1 &#x3bc;m.

Redox flow battery electrode, and redox flow battery

A redox flow battery is provided, including an ion-exchange membrane, a current collector plate, and an electrode that is disposed between the ion-exchange membrane and the current collector plate. The electrode includes a main electrode layer in which an electrolytic solution flows from a surface on the current collector plate side to a surface on the ion-exchange membrane side, and the main electrode layer includes a plurality of main electrode pieces which are arranged in parallel in a plane direction.

Redox flow battery

An electrode material including a conductive sheet containing carbon nanotubes having an average fiber diameter of 1 &#x3bc;m or less; a liquid inflow member that is formed on a first surface of the conductive sheet such that an electrolyte solution that is passed therethrough flows into the conductive sheet; and a liquid outflow member that is formed on a second surface of the conductive sheet and out of which flows the electrolyte solution that has passed through the conductive sheet; wherein, when using a sheet surface of the conductive sheet as a reference plane, the Darcy permeability, in an in-plane direction, inside the liquid inflow member, is at least 100 times the Darcy permeability, in a normal direction, through the conductive sheet.

Electrode material, electrode of redox flow battery, and redox flow battery

This method for producing a vanadium compound has an alkaline leaching step for immersing incineration ash in an alkaline solution to cause vanadium to leach from the incineration ash into the alkaline solution and obtain a leachate slurry, a solid-liquid separation step for separating the leachate slurry obtained in the alkaline leaching step into a solid and liquid followed by removing insoluble matter to obtain a leachate, a pH adjustment step for adding acid to the leachate following solid-liquid separation to make the leachate acidic, an aging step for aging the leachate following pH adjustment until a precipitate forms in the leachate, and a separation step for separating the precipitate from the leachate following the aging step.

Method for producing vanadium compound, method for producing vanadium solution, and method for producing redox flow battery electrolyte

The invention provides a method of producing a cathode active material for a lithium secondary battery, whereby it is possible to configure a lithium secondary battery in which the discharge capacity is improved and elution of lithium ions from the lithium metal phosphate is suppressed when washing the lithium metal phosphate after the same was synthesized. The method of producing a cathode active material for a lithium secondary battery includes synthesizing a lithium metal phosphate represented by a composition formula LiMPO, wherein the element M represents one or two or more of transition metals selected from among Fe, Mn, Co and Ni, and after the synthesis, washing the lithium metal phosphate with a washing liquid containing lithium ion.

Method of producing cathode active material for lithium secondary battery

A cathode material for a lithium secondary battery, including fibrous carbon and a plurality of cathode active material particles bonded to a surface of the fibrous carbon. The cathode active material particles are composed of olivine-type LiMPOwhere M represents one or more kinds of elements selected from Fe, Mn, Ni, and Co. Also disclosed is a method of producing the cathode material and a lithium secondary battery.

Cathode material for lithium secondary battery, and method of producing said cathode material

A method is employed for producing a positive electrode active material for a lithium secondary battery that comprises mixing lithium phosphate having a particle diameter Dof 100 &#x3bc;m or less, an M element-containing compound having a particle diameter Dof 100 &#x3bc;m or less (where, M is one type or two or more types of elements selected from the group consisting of Mg, Ca, Fe, Mn, Ni, Co, Zn, Ge, Cu, Cr, Ti, Sr, Ba, Sc, Y, Al, Ga, In, Si, B and rare earth elements) and water, adjusting the concentration of the M element with respect to water to 4 moles/L or more to obtain a raw material, and producing olivine-type LiMPOby carrying out hydrothermal synthesis using the raw material.

Production method of positive electrode active material for lithium secondary battery

The invention relates to a carbon nanofiber containing at least iron (Fe) and vanadium (V), wherein the iron (Fe) is present in an amount of 6 mass % or less and the vanadium (V) is present in an amount of 3 mass % or less as a metal element other than carbon, wherein a graphite plane is inclined to the fiber axis.

Carbon nanofiber, production process and use

The invention relates to (1) carbon nanofiber containing iron (Fe) of 6 mass % or less and vanadium (V) of 3 mass % or less as a metal impurity other than carbon, which does not substantially contain metal elements other than Fe and V, (2) a method for producing carbon nanofiber characterized in contacting a catalyst in which Fe and V are supported on a carbon support and a carbon-containing compound at a high temperature, (3) a resin composite material in which the carbon nanofiber is blended and (4) use thereof. According to the invention, an inexpensive carbon fiber filler material can be obtained which has a low content of metal impurities and enables to exhibit electric conductivity when added to resin in a small amount.

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Tokyo, Japan

Gaku Oriji