Patents by Inventor Kazuki Takimoto
Kazuki Takimoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11735737Abstract: An object of the present invention is to provide a binder which exhibits excellent dispersibility of a conductive assistant; a slurry composition and an electrode, each of which uses this binder; and an electricity storage device which is provided with this electrode. The present invention relates to a binder for an electricity storage device, in which a loss tangent tan ? in a linear region of an aqueous dispersion liquid of 0.5% by mass of the binder and 4.6% by mass of a conductive assistant satisfies tan ?>1 in a strain dispersion measurement under measurement conditions of a measurement temperature of 25° C. and a frequency of 1 Hz, and the conductive assistant is an acetylene black having an average particle diameter of 30 nm or more and 40 nm or less and a specific surface area of 65 m2/g or more and 70 m2/g or less; a slurry composition and an electrode, each of which uses this binder; an electricity storage device which is provided with this electrode; and the like.Type: GrantFiled: August 28, 2020Date of Patent: August 22, 2023Assignee: FUJIFILM WAKO PURE CHEMICAL CORPORATIONInventors: Kaho Mori, Tomoyuki Mori, Kazuki Takimoto, Masahiro Takano, Kei Kawano
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Publication number: 20230261198Abstract: Provided is a secondary battery binder composition containing a water-soluble crosslinked polymer obtained by crosslinking a copolymer containing a (meth)acrylic acid component and a (meth)acrylic acid ester component as constitutional components by an aziridine compound, and water. Also provided are an electrode composition, an electrode sheet, a secondary battery, a production method for the electrode sheet, and a production method for the secondary battery.Type: ApplicationFiled: March 22, 2023Publication date: August 17, 2023Inventors: Kei KAWANO, Kazuki TAKIMOTO, Kaho MORI, Tomonori MIMURA, Ikuo KINOSHITA, Atsushi SUGASAKI
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Publication number: 20220190343Abstract: An object of the present invention is to provide a binder which exhibits excellent dispersibility of a conductive assistant; a slurry composition and an electrode, each of which uses this binder; and an electricity storage device which is provided with this electrode. The present invention relates to a binder for an electricity storage device, in which a loss tangent tan ? in a linear region of an aqueous dispersion liquid of 0.5% by mass of the binder and 4.6% by mass of a conductive assistant satisfies tan ?>1 in a strain dispersion measurement under measurement conditions of a measurement temperature of 25° C. and a frequency of 1 Hz, and the conductive assistant is an acetylene black having an average particle diameter of 30 nm or more and 40 nm or less and a specific surface area of 65 m2/g or more and 70 m2/g or less; a slurry composition and an electrode, each of which uses this binder; an electricity storage device which is provided with this electrode; and the like.Type: ApplicationFiled: August 28, 2020Publication date: June 16, 2022Inventors: Kaho MORI, Tomoyuki MORI, Kazuki TAKIMOTO, Masahiro TAKANO, Kei KAWANO
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Publication number: 20220181633Abstract: The present invention relates to a binder for electricity storage devices containing a salt of a polymer containing structural units derived from (i) an ethylenically unsaturated carboxylic acid monomer and (ii) an ethylenically unsaturated monomer having at least one group selected from a hydroxy group, a dialkylamino group, an acetyl group, a sulfo group, a phosphate group, or a cyano group and neutralized with a monoamine, a polyvalent amine having an amine value of less than 21, and/or an onium hydroxide; a slurry composition and an electrode, each of which uses this binder; an electricity storage device which is provided with this electrode; and the like.Type: ApplicationFiled: February 22, 2022Publication date: June 9, 2022Applicants: FUJIFILM Corporation, FUJIFILM Wako Pure Chemical CorporationInventors: Kei KAWANO, Kazuki TAKIMOTO, Kaho MORI
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Patent number: 11258066Abstract: An object of the present invention is to provide an excellent binder agent composition solving problems such as the decrease in a charge/discharge capacity that occurs in a case where a silicon-containing active material is used, a slurry composition and an electrode in which the binder agent composition is used, and a method for preparing the electrode.Type: GrantFiled: February 2, 2018Date of Patent: February 22, 2022Assignee: FUJIFILM Wako Pure Chemical CorporationInventors: Hironori Mizuta, Kazuki Takimoto, Hiromi Watahiki, Kaho Sugimoto, Takatoshi Matsuura, Kuniaki Okamoto, Nobutaka Shimamura
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Publication number: 20200235396Abstract: An object of the present invention is to provide an excellent binder agent composition solving problems such as the decrease in a charge/discharge capacity that occurs in a case where a silicon-containing active material is used, a slurry composition and an electrode in which the binder agent composition is used, and a method for preparing the electrode.Type: ApplicationFiled: February 2, 2018Publication date: July 23, 2020Inventors: Hironori MIZUTA, Kazuki TAKIMOTO, Hiromi WATAHIKI, Kaho SUGIMOTO, Takatoshi MATSUURA, Kuniaki OKAMOTO, Nobutaka SHIMAMURA
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Publication number: 20190367657Abstract: An object of the present invention is to provide an excellent binder agent composition solving problems such as the decrease in a charge/discharge capacity, a slurry composition and an electrode in which the binder agent composition is used, and a method for preparing the electrode. The present invention relates to “a binder agent composition containing a copolymer containing a monomer unit derived from acrylic acid and one or two kinds of monomer units derived from a compound represented by the following general formula (I) or the like as constituent components, a bivalent to decavalent alcohol, and water; [in the formula, R1 represents a hydrogen atom or a methyl group, in a case where R2 is a hydrogen atom, R1 represents a methyl group, and R2 represents a hydrogen atom; an alkyl group; an alkyl group substituted with a fluorine atom or a hydroxy group, or the like.Type: ApplicationFiled: February 2, 2018Publication date: December 5, 2019Inventors: Hironori MIZUTA, Kazuki TAKIMOTO, Hiromi WATAHIKI, Kaho SUGIMOTO, Takatoshi MATSUURA, Kuniaki OKAMOTO, Nobutaka SHIMAMURA
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Publication number: 20180366729Abstract: An electric storage device is provided with a positive electrode having a positive-electrode mixture layer including a positive-electrode active material. The positive-electrode active material includes a lithium-vanadium-phosphate from 8% to 70% by mass and a lithium-nickel complex oxide from 20% to 82% by mass. A coating concentration of the positive-electrode mixture layer is from 4 mg/cm2 to 20 mg/cm2. The lithium-nickel complex oxide includes a nickel element from 0.3 mol to 0.8 mol with respect to a lithium element of 1 mol.Type: ApplicationFiled: August 16, 2018Publication date: December 20, 2018Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.Inventors: Hideo Yanagita, Kazuki Takimoto, Takahito Sakuraba, Ken Baba, Yasuyuki Kiya, Tsutomu Kikuchi
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Patent number: 9437866Abstract: A process for producing a lithium vanadium phosphate-carbon composite includes a first step that includes mixing a lithium source, a tetravalent or pentavalent vanadium compound, a phosphorus source, and a conductive carbon material source that produces carbon through pyrolysis, in an aqueous solvent to prepare a raw material mixture, a second step that includes heating the raw material mixture to effect a precipitation reaction to obtain a reaction mixture that includes a precipitate, a third step that includes subjecting the reaction mixture that includes the precipitate to wet grinding using a media mill to obtain a slurry that includes ground particles, a fourth step that includes spray-drying the slurry that includes the ground particles to obtain a reaction precursor, and a fifth step that includes calcining the reaction precursor at 600 to 1300° C. in an inert gas atmosphere or a reducing atmosphere.Type: GrantFiled: September 22, 2011Date of Patent: September 6, 2016Assignees: NIPPON CHEMICAL INDUSTRIAL CO., LTD., FUJI JUKOGYO KABUSHIKI KAISHAInventors: Tsutomu Kikuchi, Kazuki Takimoto, Hideo Yanagita
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Publication number: 20150140432Abstract: To provide an electric storage device that has excellent charging characteristics, particularly at a low temperature. Provided is a nonaqueous solvent-based electric storage device containing as positive electrode active materials, at least one of a lithium nickel aluminum complex oxides and a spinel-type lithium manganese oxide active material having LiMn2O4 as a basic structure, and lithium vanadium phosphate.Type: ApplicationFiled: April 8, 2013Publication date: May 21, 2015Inventors: Hideo Yanagita, Kazuki Takimoto
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Patent number: 8802293Abstract: A positive-electrode material includes lithium vanadium phosphate particles having an average primary particle diameter from 0.3 ?m to 2.6 ?m and crystallite sizes from 24 nm to 33 nm. The lithium vanadium phosphate particles are coated with a conductive carbon of a range of 0.5 mass % to 2.4 mass % with respect to a total lithium vanadium phosphate particles.Type: GrantFiled: September 7, 2012Date of Patent: August 12, 2014Assignees: Fuji Jukogyo Kabushiki Kaisha, Nippon Chemical Industrial Co., Ltd.Inventors: Kazuki Takimoto, Hideo Yanagita, Tsutomu Kikuchi
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Publication number: 20130214462Abstract: A process for producing a lithium vanadium phosphate-carbon composite includes a first step that includes mixing a lithium source, a tetravalent or pentavalent vanadium compound, a phosphorus source, and a conductive carbon material source that produces carbon through pyrolysis, in an aqueous solvent to prepare a raw material mixture, a second step that includes heating the raw material mixture to effect a precipitation reaction to obtain a reaction mixture that includes a precipitate, a third step that includes subjecting the reaction mixture that includes the precipitate to wet grinding using a media mill to obtain a slurry that includes ground particles, a fourth step that includes spray-drying the slurry that includes the ground particles to obtain a reaction precursor, and a fifth step that includes calcining the reaction precursor at 600 to 1300° C. in an inert gas atmosphere or a reducing atmosphere.Type: ApplicationFiled: September 22, 2011Publication date: August 22, 2013Applicants: FUJI JUKOGYO KABUSHIKI KAISHA, NIPPON CHEMICAL INDUSTRIAL CO., LTD.Inventors: Tsutomu Kikuchi, Kazuki Takimoto, Hideo Yanagita
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Publication number: 20130084499Abstract: In a non-aqueous electrolyte secondary battery, a positive electrode active material includes a carbon-coated lithium vanadium phosphate and a lithium nickel composite oxide. A negative electrode active material includes a carbon-based active material capable of intercalating and deintercalating lithium ions. When a first charge capacity of a negative electrode per unit area is “x” (mAh/cm2), and a first charge capacity of a positive electrode per unit area is “y” (mAh/cm2), a relation of “x” and “y” satisfies 0.6?y/x?0.92.Type: ApplicationFiled: September 6, 2012Publication date: April 4, 2013Applicant: FUJI JUKOGYO KABUSHIKI KAISHAInventors: Hideo Yanagita, Kazuki Takimoto
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Publication number: 20130084500Abstract: A positive-electrode material includes lithium vanadium phosphate particles having an average primary particle diameter from 0.3 ?m to 2.6 ?m and crystallite sizes from 24 nm to 33 nm. The lithium vanadium phosphate particles are coated with a conductive carbon of a range of 0.5 mass % to 2.4 mass % with respect to a total lithium vanadium phosphate particles.Type: ApplicationFiled: September 7, 2012Publication date: April 4, 2013Applicants: NIPPON CHEMICAL INDUSTRIAL CO., LTD., FUJI JUKOGYO KABUSHIKI KAISHAInventors: Kazuki Takimoto, Hideo Yanagita, Tsutomu Kikuchi
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Publication number: 20130084492Abstract: In a non-aqueous electrolyte secondary battery, a first active material of a positive electrode includes at least one of carbon-coated LiFePO4, LiMnPO4 and Li3V2(PO4)3. A second active material of the positive electrode includes lithium nickel composite oxide. An electrolytic solution includes fluorinated ethylene carbonate.Type: ApplicationFiled: September 6, 2012Publication date: April 4, 2013Applicant: FUJI JUKOGYO KABUSHIKI KAISHAInventors: Hideo YANAGITA, Kazuki TAKIMOTO
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Publication number: 20130078522Abstract: There is provided is a lithium ion secondary battery. The lithium ion secondary battery includes: a positive electrode having a positive electrode active material layer containing a positive electrode active material containing a vanadium-based compound; and a negative electrode having a negative electrode active material layer containing a negative electrode active material into which lithium ions can be inserted/deinserted reversibly. A vanadium-based compound is dispersed in the negative electrode active material layer. As a result, a vanadium-based compound, corresponding to the vanadium-based compound contained in the positive electrode active material is dispersed in the negative electrode active material layer.Type: ApplicationFiled: September 13, 2012Publication date: March 28, 2013Applicant: FUJI JUKOGYO KABUSHIKI KAISHAInventors: Hideo YANAGITA, Kazuki Takimoto
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Publication number: 20120295163Abstract: An electric storage device is provided with a positive electrode having a positive-electrode mixture layer including a positive-electrode active material. The positive-electrode active material includes a lithium-vanadium-phosphate from 8% to 70% by mass and a lithium-nickel complex oxide from 20% to 82% by mass. A coating concentration of the positive-electrode mixture layer is from 4 mg/cm2 to 20 mg/cm2. The lithium-nickel complex oxide includes a nickel element from 0.3 mol to 0.8 mol with respect to a lithium element of 1 mol.Type: ApplicationFiled: May 18, 2012Publication date: November 22, 2012Applicants: NIPPON CHEMICAL INDUSTRIAL CO.,LTD., FUJI JUKOGYO KABUSHIKI KAISHAInventors: Hideo Yanagita, Kazuki Takimoto, Takahito Sakuraba, Ken Baba, Yasuyuki Kiya, Tsutomu Kikuchi
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Publication number: 20120213920Abstract: Provided are a positive electrode active material, a lithium ion electric storage device using the same, and a manufacturing method thereof. The positive electrode active material contains (1) lithium nickel cobalt manganese oxide, and at least one type of a lithium ion acceptance capacity adjustment compound selected from (2a) lithium vanadium composite oxide, vanadium oxide, lithium vanadium phosphate, and lithium vanadium fluorophosphate and (2b) Nb2O5, TiO2, Li3/4Ti5/3O4, WO2, MoO2, and Fe2O3. The lithium ion electric storage device contains this positive electrode active material.Type: ApplicationFiled: February 13, 2012Publication date: August 23, 2012Applicant: FUJI JUKOGYO KABUSHIKI KAISHAInventors: Hideo Yanagita, Kazuki Takimoto