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).

  • Patent number: 11942621
    Abstract: 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: Grant
    Filed: November 13, 2018
    Date of Patent: March 26, 2024
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Keita Kusuzaka, Yuichiro Hirakawa, Nobuhiro Okada
  • Patent number: 11107639
    Abstract: 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: Grant
    Filed: January 20, 2017
    Date of Patent: August 31, 2021
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Nobuhiro Okada, Keita Kusuzaka
  • Publication number: 20210202186
    Abstract: 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: Application
    Filed: March 8, 2021
    Publication date: July 1, 2021
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Nobuhiro Okada, Keita Kusuzaka
  • Patent number: 11038173
    Abstract: 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: Grant
    Filed: January 20, 2017
    Date of Patent: June 15, 2021
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Hitoshi Morita, Nobuhiro Okada, Keita Kusuzaka, Takeshi Kamijo
  • Publication number: 20200194775
    Abstract: 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: Application
    Filed: November 13, 2018
    Publication date: June 18, 2020
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Keita Kusuzaka, Yuichiro Hirakawa, Nobuhiro Okada
  • Patent number: 10468199
    Abstract: 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: Grant
    Filed: January 20, 2017
    Date of Patent: November 5, 2019
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Keita Kusuzaka, Kazuteru Umetsu, Nobuhiro Okada, Tekeshi Kamijo, Atsushi Hosokibara, Tadashi Matsushita
  • Patent number: 10403447
    Abstract: 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: Grant
    Filed: January 20, 2017
    Date of Patent: September 3, 2019
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Takeshi Kamijo, Yuichiro Hirakawa, Keita Kusuzaka, Nobuhiro Okada, Taku Suetomi
  • Patent number: 10396361
    Abstract: 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: Grant
    Filed: January 20, 2017
    Date of Patent: August 27, 2019
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Takeshi Kamijo, Keita Kusuzaka, Kazuteru Umetsu, Kimiya Murakami, Nobuhiro Okada
  • Publication number: 20190027321
    Abstract: 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: Application
    Filed: January 20, 2017
    Publication date: January 24, 2019
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Keita Kusuzaka, Kazuteru Umetsu, Nobuhiro Okada, Tekeshi Kamijo, Atsushi Hosokibara, Tadashi Matsushita
  • Publication number: 20190027754
    Abstract: 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: Application
    Filed: January 20, 2017
    Publication date: January 24, 2019
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Takeshi Kamijo, Keita Kusuzaka, Kazuteru Umetsu, Kimiya Murakami, Nobuhiro Okada
  • Publication number: 20190027319
    Abstract: 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: Application
    Filed: January 20, 2017
    Publication date: January 24, 2019
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Takeshi Kamijo, Yuichiro Hirakawa, Keita Kusuzaka, Nobuhiro Okada, Taku Suetomi
  • Publication number: 20190020034
    Abstract: 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: Application
    Filed: January 20, 2017
    Publication date: January 17, 2019
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Hitoshi Morita, Nobuhiro Okada, Keita Kusuzaka, Takeshi Kamijo
  • Publication number: 20180261399
    Abstract: 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: Application
    Filed: January 20, 2017
    Publication date: September 13, 2018
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Kazuteru Umetsu, Nobuhiro Okada, Keita Kusuzaka