Patents by Inventor Masato KURATSU
Masato KURATSU 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: 11456486Abstract: A nonaqueous electrolyte secondary battery which is provided with a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode contains: a positive electrode active material and a compound having a cobalt content of 30% by weight or more. The weight A of the compound and the total weight B of the positive electrode active material satisfy 0.01?A/(A+B)?0.15. The negative electrode contains a negative electrode active material. The nonaqueous electrolyte contains propylene carbonate and diethyl carbonate as nonaqueous solvents; the total amount of the propylene carbonate and the diethyl carbonate is 70% by volume or more relative to 100% by volume of the nonaqueous solvents; and the volume ratio of the propylene carbonate to the diethyl carbonate is within the range of from 1:1 to 1:19.Type: GrantFiled: October 25, 2019Date of Patent: September 27, 2022Assignee: KANEKA CORPORATIONInventor: Masato Kuratsu
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Publication number: 20210344016Abstract: [Problem] Repeated charge and discharge of a nonaqueous electrolyte secondary battery result in gas generation and thus a reduction in the battery capacity. [Solving Means] The problem can be solved by providing a negative electrode for nonaqueous electrolyte secondary batteries including a negative electrode active material having an average operating potential of 0.5 V (vs. Li/Li+) or more and less than 2.0 V (vs. Li/Li+) during desorption and insertion of lithium ions, a conductive aid that is carbon nanotubes having a diameter of 100 nm or less, and a binder that is macromolecules having acidic functional groups.Type: ApplicationFiled: July 8, 2021Publication date: November 4, 2021Applicant: KANEKA CORPORATIONInventor: Masato Kuratsu
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Patent number: 11108079Abstract: A lithium-ion secondary battery includes: a laminate including a positive electrode, a negative electrode, and a separator; a nonaqueous electrolyte solution; terminals; and an inclusion body. The negative electrode includes a negative electrode active material including a titanium-containing oxide, and at least one negative electrode additive selected from a carbon material, a silicon-based material, a tin-based material, and a bismuth-based material. A relation between a weight (Ma) of the negative electrode additive and a weight (Mt) of the negative electrode active material is 1.0<Mt/Ma<30.0. An area (Sp) of a positive electrode active material layer of the positive electrode is smaller than an area (Sn) of a negative electrode active material layer of the negative electrode. A positive electrode capacity (Qp) is smaller than a negative electrode capacity (Qn).Type: GrantFiled: June 6, 2017Date of Patent: August 31, 2021Assignee: KANEKA CORPORATIONInventors: Masato Kuratsu, Yukimasa Niwa
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Patent number: 10680235Abstract: A method for producing a positive electrode containing a positive electrode active material and/or a negative electrode containing a negative electrode active material. The method includes a process for producing an electrode slurry including: a first process in which a positive or negative electrode active material, a conductive additive, and a nonaqueous solvent are mixed to obtain a slurry; and a second process in which the slurry is diluted or concentrated and then mixed to obtain the electrode slurry. In the first process, the mixing is performed such that the obtained slurry has a water content of 1000 ppm or less and a viscosity of 500 cP or more and 8000 cP or less, and, in the second process, the mixing is performed such that a water content of the obtained electrode slurry is maintained at the water content of the slurry after the first process is completed.Type: GrantFiled: April 17, 2017Date of Patent: June 9, 2020Assignee: KANEKA CORPORATIONInventors: Fujika Ogaki, Masato Kuratsu, Ayumi Takaoka
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Patent number: 10651468Abstract: The present invention provides a nonaqueous electrolyte secondary battery characterized by a significantly smaller amount of gas formation and excellent cycle stability exhibited during cycle testing even when a titanium compound is used for a negative electrode. A nonaqueous electrolyte secondary battery is structured to have a casing, encapsulating a positive electrode, nonaqueous electrolyte, and a negative electrode facing the positive electrode across a separator. The negative electrode contains a titanium compound as a negative-electrode active material, the separator is electrically insulative, the positive electrode contains a spinel-type lithium manganese oxide and a layered rock salt structure compound as positive-electrode active materials, the spinel-type lithium manganese oxide is set to have a number average particle size of 10 ?m to 20 ?m, and a specific surface area of 0.05 m2/g to 0.Type: GrantFiled: February 5, 2016Date of Patent: May 12, 2020Assignee: KANEKA CORPORATIONInventors: Ayumi Takaoka, Masato Kuratsu
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Publication number: 20200067036Abstract: A battery pack includes a plurality of laminate batteries. Each of the laminate batteries contains a layered body, an outer packaging that is formed from a laminate film enclosing the layered body, a pair of electrode terminals. The outer packaging has a battery part and a bag part that is a space of which a volume is changeable, and communicates to the battery part through a single communication part, the bag part is disposed close to a second edge, which is opposite to a first edge, and the battery part is disposed close to the first edge. The laminate batteries are all arranged in a manner to have the second edges of the outer packagings on an upper side of the battery pack in a vertical direction, which is parallel to the gravity, and to have the first edge on a lower side of the battery pack in the vertical direction such that all the bag parts are disposed above the battery parts in the vertical direction.Type: ApplicationFiled: October 29, 2019Publication date: February 27, 2020Inventors: Yuuki SAWADA, Yukimasa NIWA, Mitsuyasu IMAZAKI, Takashi KIKUCHI, Masato KURATSU
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Publication number: 20200058961Abstract: A nonaqueous electrolyte secondary battery which is provided with a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode contains: a positive electrode active material and a compound having a cobalt content of 30% by weight or more. The weight A of the compound and the total weight B of the positive electrode active material satisfy 0.01?A/(A+B)?0.15. The negative electrode contains a negative electrode active material. The nonaqueous electrolyte contains propylene carbonate and diethyl carbonate as nonaqueous solvents; the total amount of the propylene carbonate and the diethyl carbonate is 70% by volume or more relative to 100% by volume of the nonaqueous solvents; and the volume ratio of the propylene carbonate to the diethyl carbonate is within the range of from 1:1 to 1:19.Type: ApplicationFiled: October 25, 2019Publication date: February 20, 2020Applicant: KANEKA CORPORATIONInventor: Masato KURATSU
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Publication number: 20190140259Abstract: A method for producing a positive electrode containing a positive electrode active material and/or a negative electrode containing a negative electrode active material. The method includes a process for producing an electrode slurry including: a first process in which a positive or negative electrode active material, a conductive additive, and a nonaqueous solvent are mixed to obtain a slurry; and a second process in which the slurry is diluted or concentrated and then mixed to obtain the electrode slurry. In the first process, the mixing is performed such that the obtained slurry has a water content of 1000 ppm or less and a viscosity of 500 cP or more and 8000 cP or less, and, in the second process, the mixing is performed such that a water content of the obtained electrode slurry is maintained at the water content of the slurry after the first process is completed.Type: ApplicationFiled: April 17, 2017Publication date: May 9, 2019Applicant: KANEKA CORPORATIONInventors: Fujika OGAKI, Masato KURATSU, Ayumi TAKAOKA
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Publication number: 20190115621Abstract: The present invention is intended to provide a lithium-ion secondary battery and an assembled battery that have good cycle characteristics and safety while using a negative electrode in which an additive such as a carbon-based material is used in combination with a titanium-containing oxide. In the present invention, a lithium-ion secondary battery includes: a laminate including a positive electrode, a negative electrode, and a separator; a nonaqueous electrolyte solution; terminals; and an inclusion body. The negative electrode includes: a negative electrode active material including a titanium-containing oxide; and at least one negative electrode additive selected from a carbon material, a silicon-based material, a tin-based material, and a bismuth-based material. A relation between a weight (Ma) of the negative electrode additive and a weight (Mt) of the negative electrode active material is 1.0<Mt/Ma<30.0.Type: ApplicationFiled: June 6, 2017Publication date: April 18, 2019Applicant: KANEKA CORPORATIONInventors: Masato KURATSU, Yukimasa NIWA
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Publication number: 20180034053Abstract: The present invention provides a nonaqueous electrolyte secondary battery characterized by a significantly smaller amount of gas formation and excellent cycle stability exhibited during cycle testing even when a titanium compound is used for a negative electrode. A nonaqueous electrolyte secondary battery is structured to have a casing, encapsulating a positive electrode, nonaqueous electrolyte, and a negative electrode facing the positive electrode across a separator. The negative electrode contains a titanium compound as a negative-electrode active material, the separator is electrically insulative, the positive electrode contains a spinel-type lithium manganese oxide and a layered rock salt structure compound as positive-electrode active materials, the spinel-type lithium manganese oxide is set to have a number average particle size of 10 ?m to 20 ?m, and a specific surface area of 0.05 m2/g to 0.Type: ApplicationFiled: February 5, 2016Publication date: February 1, 2018Applicant: KANEKA CORPORATIONInventors: Ayumi TAKAOKA, Masato KURATSU
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Publication number: 20170222197Abstract: A battery pack containing a plurality of plate-shaped laminate batteries arranged in a direction vertical to a plate-shaped surface of one of the laminate batteries. The laminate battery contains: a layered body which includes a negative electrode, a separator, and a positive electrode, and is disposed parallel to the plate-shaped surface of the laminate battery; an outer packaging including a laminate film enclosing the layered body; and an electrode terminal which is electrically connected to the layered body and extends from a one side part of the outer packaging. The outer packaging has, in an inside thereof, a battery part having a space in which the layered body exists and a bag part which has a space a volume of which is changeable, communicates to the battery part through a communication part, and is disposed on an other side part opposite to the one side part.Type: ApplicationFiled: July 13, 2015Publication date: August 3, 2017Applicant: KANEKA CORPORATIONInventors: Yuuki SAWADA, Yukimasa NIWA, Mitsuyasu IMAZAKI, Takashi KIKUCHI, Masato KURATSU