Showa Denko K.k.

Murata Manufacturing Co., Ltd.

Isao Kabe

Kazumi Naito

Akihisa Tonegawa

Akihiko Shirakawa

Gaku Oriji

Hiroyuki Tomita

Hideki Oohata

Koichi Hasegawa

Masaaki Nishioka

A magnetic sensorincludes: a non-magnetic substrate; a sensitive circuitprovided on a surface of the substrateand including a sensitive partsensing a magnetic field by a magnetic impedance effect; a terminal partand a terminal partconnected to respective both end portions of the sensitive circuit; and a conductive returning member with one end portion being connected to the terminal part, the returning member returning back toward the terminal part

Magnetic sensor and magnetic sensor device

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

Provided is a method for producing a lithium metal phosphate, and the method comprises initiating and allowing to proceed, in the presence of a polar solvent, a conversion reaction of a lithium ion (Li) source such as lithium hydroxide, a divalent transition metal ion (M) source such as a divalent transition metal sulfate, and a phosphate ion (PO) source such as phosphoric acid into a lithium metal phosphate at 150&#xb0; C. or higher. The conversion reaction is initiated and allowed to proceed by bringing solution A containing one of a lithium ion, a divalent transition metal ion, and a phosphate ion into contact with solution B containing the others of these ions at 150&#xb0; C. or higher, or by adjusting the pH of solution C that has a pH of lower than 4 and contains a lithium ion, a divalent transition metal ion, and a phosphate ion to 4 or higher.

Method for producing lithium metal phosphate

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

An element for a solid electrolytic capacitor having low equivalent series resistance (ESR) and high capacitance per unit volume obtained by controlling the composition or the thickness of the silver paste forming a laminated structure on the anode substrate having a carbon paste layer on the surface. Using two kinds of silver pastes each having different wettability on the carbon paste layer and applying each silver paste on the side (edge) portions and face portions of an anode substrate, respectively, a desired layer thickness can be obtained as a whole. A solid electrolytic capacitor element preferably has a silver paste layer coating the side (edge) portions of the anode substrate which is thicker than the silver paste layer covering the face portions of the anode substrate, wherein a silver paste of composition having a water amount of 0.5 mass % or less is preferably used.

Solid electrolytic capacitor and method for manufacturing same

The invention provides a solid electrolytic capacitor element, comprising a metal oxide layer, an electroconductive polymer layer, a carbon paste layer and a silver paste layer sequentially formed on surface of a valve-acting metal material, wherein thickness of the silver paste layer is within a range of 5 to 20 &#x3bc;m and the mass ratio of silver contained in the silver paste layer is within a range of 84 to 94%. According to the invention, a solid electrolytic capacitor having good electric properties such as ESR (equivalent series resistance) and LC (leakage current) and good reliability can be produced.

Solid electrolytic capacitor element and solid electrolytic capacitor using same

A tantalum sintered body comprising a pore size distribution having a plurality of peaks wherein out of a plurality of peaks, two peaks having a largest relative intensity and a second largest relative intensity have a pore diameter of 0.2 to 0.7 &#x3bc;m and a pore diameter of 0.7 to 3 &#x3bc;m, having a volume of pore 10 mmor more including the volume of pore voids and a specific area of 0.2 to 7 m/g, and having a CV value of 40,000 to 200,000 &#x3bc;FV/g when sintered at 1,300&#xb0; C., and a capacitor using the sintered body.

Tantalum sintered body and capacitor using the sintered body

1. A niobium powder for capacitors, wherein the chromium content is 50 ppm by mass or less, granulated product and sintered body thereof, and producing method of those; 2. a capacitor constructed by one part electrode formed of the niobium sintered body, another part electrode and a dielectric material interposed between two electrodes, and its producing method; and 3. an electronic circuit and electronic device using the capacitor. A capacitor having good voltage resistance properties can be manufactured by using the niobium sintered body for capacitors of the present invention, wherein the chromium content is 50 ppm by mass or less.

Niobium for capacitor and capacitor using sintered body of the niobium

The present invention relates to a method for producing a niobium-oxide solid electrolytic capacitor having an anode being at least one member selected from niobium monoxide, niobium and an alloy mainly comprising niobium, or a mixture of niobium monoxide with niobium or an alloy mainly comprising niobium, which capacitor formed by the electrolytic oxidation (electrochemical formation) of the anode; and the method including sequentially repeating twice or more a step of exposing a dielectric layer to a temperature to 1,000&#xb0; C. before formation of a cathode and a step of re-electrochemically forming the dielectric layer. The niobium solid electrolytic capacitor obtained by the present invention improved in the leakage current value after mounting and excellent in reliability.

Production method of solid electrolytic capacitor

The invention relates to a niobium powder capable of providing a capacitor having small amounts of leakage current, wherein the average nitrogen concentration in the layer of 50 to 200 nm from the surface to 0.29 to 4% by mass and preferably controlling that in the depth within 50 nm from the surface to 0.19 to 1% by mass, the sintered body, the formed body and the capacitor using the same.

Niobium powder, sintered body thereof, chemically modified product thereof and capacitor using them

A niobium sintered body which is prepared in such a manner that a niobium powder is sintered at a temperature of 500&deg; C. to 2000&deg; C. and allowed to stand at a maximum sintering temperature for 60 minutes to 150 minutes in the course of sintering. The niobium sintered body of the present invention is characterized in that a product (CV) of a capacitance (C) per unit mass and a forming voltage (V) is 90,000 &mgr;F&middot;V/g or more, and a value obtained by dividing a product of a mean particle diameter (D ) of a primary particle of said niobium powder and a leakage current (LC) by said CV is 5&times;10 &mgr;m&middot;&mgr;A (&mgr;F&middot;V) or less. And there can be provided a well-balanced capacitor with respect to a preferably low leakage current value regardless of the large capacitance, that is, a highly reliable capacitance.

Niobium sintered body, production method therefor, and capacitor using the same

A light-emitting diode comprises a first layer of Si-doped N-type Ga.sub.1-x Al.sub.x As, a second layer of Si-doped P-type Ga.sub.1-y Al.sub.y As and a third layer of P-type Ga.sub.1-z Al.sub.z As, in that order, in which the first and third layers have a higher Al concentration than the second layer, an Al concentration in the second layer decreases going from a first layer side to a third layer side, an Al concentration in a portion of the second layer in contact with the third layer is higher than an Al concentration value in a portion of the second layer in contact with the first layer minus 0.06, the second layer is formed to a thickness of approximately 8 .mu.m to 50 .mu.m, and light emission is via the first layer.

Growing community of inventors

Chiba, Japan

Isao Kabe