Patents by Inventor Keita Kusuzaka
Keita Kusuzaka 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: 11942621Abstract: Provided is a positive electrode precursor having a positive electrode active material layer, wherein the mass proportion A1 of a carbon material in the positive electrode active material layer accounts for 15-65 mass %, the mass proportion A2 of a lithium transition metal oxide in the positive electrode active material layer accounts for 5-35 mass %, the mass proportion A3 of an alkali metal compound in the positive electrode active material layer accounts for 10-50 mass %, A2/A1 is 0.10-2.00, A1/A3 is 0.50-3.00, and the positive electrode active material layer has a peel strength of 0.02-3.00 N/cm.Type: GrantFiled: November 13, 2018Date of Patent: March 26, 2024Assignee: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Keita Kusuzaka, Yuichiro Hirakawa, Nobuhiro Okada
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Patent number: 11107639Abstract: This positive electrode precursor includes: a positive electrode active material containing a carbon material and an alkali metal compound, wherein 5?A?35, when A (g/m2) is a weight of the alkali metal compound in the positive electrode active material layer at one surface of the positive electrode precursor, 10?B?100 as well as 0.20?A/B?1.00, when B (g/m2) is a weight of the positive electrode active material in the positive electrode active material layer, and 1?C?20, when C (m2/cm2) is a specific surface area per unit area as measured by the BET method at one surface of the positive electrode precursor.Type: GrantFiled: January 20, 2017Date of Patent: August 31, 2021Assignee: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Nobuhiro Okada, Keita Kusuzaka
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Publication number: 20210202186Abstract: This positive electrode precursor includes: a positive electrode active material containing a carbon material and an alkali metal compound, wherein 5?A?35, when A (g/m2) is a weight of the alkali metal compound in the positive electrode active material layer at one surface of the positive electrode precursor, 10?B?100 as well as 0.20?A/B?1.00, when B (g/m2) is a weight of the positive electrode active material in the positive electrode active material layer, and 1?C?20, when C (m2/cm2) is a specific surface area per unit area as measured by the BET method at one surface of the positive electrode precursor.Type: ApplicationFiled: March 8, 2021Publication date: July 1, 2021Applicant: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Nobuhiro Okada, Keita Kusuzaka
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Patent number: 11038173Abstract: A lithium ion secondary battery of the present disclosure is provided with a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte containing lithium ions.Type: GrantFiled: January 20, 2017Date of Patent: June 15, 2021Assignee: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Hitoshi Morita, Nobuhiro Okada, Keita Kusuzaka, Takeshi Kamijo
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Publication number: 20200194775Abstract: Provided is a positive electrode precursor having a positive electrode active material layer, wherein the mass proportion A1 of a carbon material in the positive electrode active material layer accounts for 15-65 mass %, the mass proportion A2 of a lithium transition metal oxide in the positive electrode active material layer accounts for 5-35 mass %, the mass proportion A3 of an alkali metal compound in the positive electrode active material layer accounts for 10-50 mass %, A2/A1 is 0.10-2.00, A1/A3 is 0.50-3.00, and the positive electrode active material layer has a peel strength of 0.02-3.00 N/cm.Type: ApplicationFiled: November 13, 2018Publication date: June 18, 2020Applicant: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Keita Kusuzaka, Yuichiro Hirakawa, Nobuhiro Okada
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Patent number: 10468199Abstract: This nonaqueous lithium power storage element contains a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte that contains lithium ions. The positive electrode has a positive electrode current collector and a positive electrode active material layer disposed on one surface or both surfaces of the positive electrode current collector, and the positive electrode active material layer contains a positive electrode active material that contains a carbon material. When the pore distribution of the positive electrode active material layer is measured by mercury intrusion, the pore distribution curve for the relationship between the pore diameter and log differential pore volume has at least one peak having a peak value of 1.0-5.0 mL/g for the log differential pore volume in the pore diameter range of 0.1-50 ?m, and the total cumulative pore volume Vp in the pore diameter range of 0.1-50 ?m is 0.7-3.0 mL/g.Type: GrantFiled: January 20, 2017Date of Patent: November 5, 2019Assignee: Asahi Kasei Kabushiki KaishaInventors: Keita Kusuzaka, Kazuteru Umetsu, Nobuhiro Okada, Tekeshi Kamijo, Atsushi Hosokibara, Tadashi Matsushita
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Patent number: 10403447Abstract: The disclosure relates to a lithium storage element containing a positive electrode that contains a lithium compound other than an active material, a negative electrode, a separator, and a nonaqueous electrolytic solution containing lithium ions, for which an active material is applied on both surfaces of a nonporous positive electrode power collector, and a negative electrode active material capable of storing and releasing lithium ions is applied on both surfaces of a nonporous negative electrode power collector.Type: GrantFiled: January 20, 2017Date of Patent: September 3, 2019Assignee: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Takeshi Kamijo, Yuichiro Hirakawa, Keita Kusuzaka, Nobuhiro Okada, Taku Suetomi
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Patent number: 10396361Abstract: The disclosure provides a nonaqueous lithium power storage element containing a positive electrode, a negative electrode, a separator and a lithium ion-containing nonaqueous electrolytic solution.Type: GrantFiled: January 20, 2017Date of Patent: August 27, 2019Assignee: Asahi Kasei Kabushiki KaishaInventors: Takeshi Kamijo, Keita Kusuzaka, Kazuteru Umetsu, Kimiya Murakami, Nobuhiro Okada
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Publication number: 20190027321Abstract: The disclosure relates to a nonaqueous lithium power storage element containing a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte that contains lithium ions.Type: ApplicationFiled: January 20, 2017Publication date: January 24, 2019Applicant: Asahi Kasei Kabushiki KaishaInventors: Keita Kusuzaka, Kazuteru Umetsu, Nobuhiro Okada, Tekeshi Kamijo, Atsushi Hosokibara, Tadashi Matsushita
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Publication number: 20190027754Abstract: The disclosure provides a nonaqueous lithium power storage element containing a positive electrode, a negative electrode, a separator and a lithium ion-containing nonaqueous electrolytic solution.Type: ApplicationFiled: January 20, 2017Publication date: January 24, 2019Applicant: Asahi Kasei Kabushiki KaishaInventors: Takeshi Kamijo, Keita Kusuzaka, Kazuteru Umetsu, Kimiya Murakami, Nobuhiro Okada
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Publication number: 20190027319Abstract: The disclosure relates to a lithium storage element containing a positive electrode that contains a lithium compound other than an active material, a negative electrode, a separator, and a nonaqueous electrolytic solution containing lithium ions, for which an active material is applied on both surfaces of a nonporous positive electrode power collector, and a negative electrode active material capable of storing and releasing lithium ions is applied on both surfaces of a nonporous negative electrode power collector.Type: ApplicationFiled: January 20, 2017Publication date: January 24, 2019Applicant: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Takeshi Kamijo, Yuichiro Hirakawa, Keita Kusuzaka, Nobuhiro Okada, Taku Suetomi
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Publication number: 20190020034Abstract: A lithium ion secondary battery of the present disclosure is provided with a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte containing lithium ions.Type: ApplicationFiled: January 20, 2017Publication date: January 17, 2019Applicant: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Hitoshi Morita, Nobuhiro Okada, Keita Kusuzaka, Takeshi Kamijo
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Publication number: 20180261399Abstract: This positive electrode precursor includes: a positive electrode active material containing a carbon material and an alkali metal compound, wherein 5?A?35, when A (g/m2) is a weight of the alkali metal compound in the positive electrode active material layer at one surface of the positive electrode precursor, 10?B?100 as well as 0.20?A/B?1.00, when B (g/m2) is a weight of the positive electrode active material in the positive electrode active material layer, and 1?C?20, when C (m2/cm2) is a specific surface area per unit area as measured by the BET method at one surface of the positive electrode precursor.Type: ApplicationFiled: January 20, 2017Publication date: September 13, 2018Applicant: Asahi Kasei Kabushiki KaishaInventors: Kazuteru Umetsu, Nobuhiro Okada, Keita Kusuzaka