Ōsaka, Japan
Ōsaka, Japan

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To provide the following: a positive-electrode active material for a lithium secondary battery, said material being inexpensive to synthesize and having good storage characteristics after battery manufacture; a manufacturing method therefor; a positive electrode provided with said positive-electrode active material; and a lithium secondary battery provided therewith. [Solution] This positive-electrode active material for a lithium secondary battery contains a carbonaceous material and iron-containing lithium titanate that has a cubic rock-salt structure and can be represented by the composition formula Li_(1+x)(Ti_(1y)Fe_(y))_(1x)O_(2 )(with 0


There is provided an oxidant dopant agent for conductive polymer production, and a solution thereof, in which they are capable of producing a conductive polymer suitable in producing an electrolyte capacitor having a low leak current. There is also provided a conductive polymer prepared by using either of them. There is also provided an electrolyte capacitor having a low leak current. The oxidant dopant agent includes: an organic ferric sulfonate; and at least one kind selected from the group consisting of phosphoric acid, phosphate, phosphorous acid, phosphite, boric acid, borate, thiophosphoric acid, thiophosphate, dithiophosphoric acid and dithiophosphate. The solution includes the oxidant dopant agent dissolved in water, an alcohol or a mixture of water and an alcohol. A conductive polymer is prepared by means of oxidation polymerization of a monomer such as thiophene or its derivative. The conductive polymer is used as an electrolyte to provide an electrolyte capacitor.


Patent
Tayca Corporation | Date: 2012-05-10

There is provided a method to provide a capacitor element including a porous body of a valve metal, and a dielectric layer of an oxide layer of the valve metal. The method includes a first sequential process, and a second sequential process. The first sequential process includes: immersing the capacitor element in a first liquid of dispersion of a conductive polymer obtained by means of oxidation polymerization of thiophene or its derivative in the presence of a dopant of a polymer anion; taking out the capacitor element from the first liquid; and drying the capacitor element. Subsequent second sequential process includes: immersing the capacitor element in a second liquid which dissolves a cyclic organic compound having at least one hydroxyl group; taking out the capacitor element from the second liquid; and drying the capacitor element.


There is provided a conductive polymer having high conductivity with excellent heat resistance. Using the conductive polymer, there can be provided solid electrolytic capacitors having low ESR, high reliability, and less leakage current. There can be also provided conductive films having high conductivity and superior heat resistance. There is provided a conductive polymer dispersion liquid obtained by a method in which in the presence of a copolymer from styrenesulfonic acid, and at least one kind of a non-sulfonic acid monomer selected from the group consisting of methacrylate, acrylate, and an unsaturated hydrocarbon containing alkoxysilane compound or its hydrolysate, thiophene or its derivative is polymerized by oxidation polymerization in water, or in an aqueous solution comprising a mixture of water and a water miscible solvent to produce the conductive polymer dispersion liquid. Using the conductive polymer as solid electrolyte, a solid electrolyte capacitor can be provided. Also, using the conductive polymer, a conductive film can be provided.


There is provided a conductive polymer having a high electrical conductivity and an excellent heat resistance. Using it as a solid electrolyte, there is provided a solid electrolyte capacitor having a low ESR and a large capacitance with good reliability under a hot condition. A monomer mixture of 2,3-dihydro-thieno [3,4-b] [1,4] dioxine and 2-alkyl -2,3-dihydro-thieno [3,4-b] [1,4] dioxine at a mixture ratio of 0.05:1 1 to 1:0.1 by the molar ratio is polymerized in the presence of an organic sulfonic acid, and the organic sulfonic acid is included as a dopant. As the 2-alkyl -2,3-dihydro-thieno [3,4-b] [1,4] dioxine, the alkyl portion can be methyl, ethyl, propyl or butyl.


There is provided a monomer liquid for conductive polymer production, comprising: at least one monomer selected from the group consisting of thiophene or its derivatives, pyrrole or its derivative and aniline or its derivative; and at least one kind selected from the group consisting of a naphthalene sulfonic acid type heterocyclic compound and a benzene sulfonic acid type heterocyclic compound in which no hydroxyl group is directly connected to the benzene ring, wherein said at least one kind is dispersed in said at least one monomer. Also, there is provided a production of an electrolyte capacitor by using the monomer liquid for conductive polymer production is explained. In particular, imidazoles are favorable as the naphthalene sulfonic acid type heterocyclic compound and the benzene sulfonic acid type heterocyclic compound.


The layered double hydroxide is characterized by comprising base layers each comprising a metal double hydroxide represented by the formula: M(II)1-XM(III)X(OH)2 (wherein M(II) represents one or two bivalent metal atoms; M(III) represents a trivalent metal atom; and x represents 0.2 to 0.33), and an intermediate layer and interlayer water each intercalated between the base layers, wherein the intermediate layer comprises a compound represented by the formula: R1-COOH or R2-SO3H (wherein R1 and R2 independently represent at least one substituent selected from an aliphatic hydrocarbon group, a substituted aliphatic hydrocarbon group, an aromatic hydrocarbon group, a substituted aromatic hydrocarbon group, a heterocyclic group and a substituted heterocyclic group).


Patent
Tayca Corporation | Date: 2013-03-14

A method for manufacturing lithium titanate (Li_(4)Ti_(5)O_(12)) of a substantially single phase, which is excellent in rate performance, and can be easily handled. The lithium titanate (Li_(4)Ti_(5)O_(12)) is prepared from substantially a raw material powder consisting of a lithium compound and a raw material powder consisting of a titanic acid compound which are mixed and the resultant mixture is calcined. A lithium carbonate is used as the lithium compound and metatitanic acid or orthotitanic acid is used as the titanic acid compound. The penetration speed coefficient of the lithium titanate obtained, to a nonaqueous electrolyte is larger than a penetration speed coefficient of lithium titanate, obtained by using a lithium hydroxide as the lithium compound, to the same nonaqueous electrolyte. The specific surface area of the lithium titanate obtained is 10 m^(2)/g or less.


[Object] A layered double hydroxide which has selective adsorbability to unsaturated fatty acids and can have a neutral pH value (i.e., a weakly acidic to weakly alkaline pH value) upon being dispersed in water and a cosmetic produced using the layered double hydroxide have been demanded. [Solution] The layered double hydroxide according to the present invention is characterized by comprising base layers each comprising a metal double hydroxide represented by the formula: M(II)1-XM(III)X(OH)2 (wherein M(II) represents one or two bivalent metal atoms; M(III) represents a trivalent metal atom; and x represents 0.2 to 0.33), and an intermediate layer and interlayer water each intercalated between the base layers, wherein the intermediate layer comprises a compound represented by the formula: R1-COOH or R2-SO3H (wherein R1 and R2 independently represent at least one substituent selected from an aliphatic hydrocarbon group, a substituted aliphatic hydrocarbon group, an aromatic hydrocarbon group, a substituted aromatic hydrocarbon group, a heterocyclic group and a substituted heterocyclic group).


Patent
Tayca Corporation | Date: 2015-01-21

An object is to provide a method for manufacturing, in an industrially advantageous manner, lithium titanate (Li_(4)Ti_(5)O_(12)) which is of a single phase, is excellent in rate performance, and can be easily handled. In the method for manufacturing the lithium titanate (Li_(4)Ti_(5)O_(12)) which is of a substantially single phase, a raw material powder consisting of a lithium compound and a raw material powder consisting of a titanic acid compound are mixed and the resultant mixture is calcined. The method for manufacturing the lithium titanate is characterized in that a lithium carbonate is used as the lithium compound and metatitanic acid or orthotitanic acid is used as the titanic acid compound. Provided is lithium titanate characterized in that a penetration speed coefficient of the lithium titanate, obtained by employing the method, to a nonaqueous electrolyte is larger than a penetration speed coefficient of lithium titanate, obtained by using a lithium hydroxide as the lithium compound, to the same nonaqueous electrolyte, and a specific surface area thereof is 10 m^(2)/g or less.

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