Patents by Inventor Kai Kimura

Kai Kimura 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: 11735736
    Abstract: A power storage device with high capacity or high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode includes an active material, a first binder, and a second binder. The specific surface area of the active material is S [m2/g]. The weight of the active material, the weight of the first binder, and the weight of the second binder are a, b, and c, respectively. The solution of {(b+c)/(a+b+c)}×100÷S is 0.3 or more. The electrode includes a first film in contact with the active material. The first film preferably includes a region in contact with the active material. The first film preferably includes a region with a thickness of 2 nm or more and 20 nm or less. The first film contains a water-soluble polymer.
    Type: Grant
    Filed: October 14, 2021
    Date of Patent: August 22, 2023
    Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Kai Kimura, Kazutaka Kuriki, Teppei Oguni, Aya Uchida
  • Publication number: 20220037666
    Abstract: A power storage device with high capacity or high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode includes an active material, a first binder, and a second binder. The specific surface area of the active material is S [m2/g]. The weight of the active material, the weight of the first binder, and the weight of the second binder are a, b, and c, respectively. The solution of {(b+c)/(a+b+c)}×100÷S is 0.3 or more. The electrode includes a first film in contact with the active material. The first film preferably includes a region in contact with the active material. The first film preferably includes a region with a thickness of 2 nm or more and 20 nm or less. The first film contains a water-soluble polymer.
    Type: Application
    Filed: October 14, 2021
    Publication date: February 3, 2022
    Inventors: Kai Kimura, Kazutaka Kuriki, Teppei Oguni, Aya Uchida
  • Patent number: 11152622
    Abstract: A power storage device with high capacity or high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode includes an active material, a first binder, and a second binder. The specific surface area of the active material is S [m2/g]. The weight of the active material, the weight of the first binder, and the weight of the second binder are a, b, and c, respectively. The solution of {(b+c)/(a+b+c)}×100÷S is 0.3 or more. The electrode includes a first film in contact with the active material. The first film preferably includes a region in contact with the active material. The first film preferably includes a region with a thickness of 2 nm or more and 20 nm or less. The first film contains a water-soluble polymer.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: October 19, 2021
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kai Kimura, Kazutaka Kuriki, Teppei Oguni, Aya Uchida
  • Publication number: 20200144621
    Abstract: A power storage device with high capacity or high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode includes an active material, a first binder, and a second binder. The specific surface area of the active material is S[m2/g]. The weight of the active material, the weight of the first binder, and the weight of the second binder are a, b, and c, respectively. The solution of {(b+c)/(a+b+c)}×100÷S is 0.3 or more. The electrode includes a first film in contact with the active material. The first film preferably includes a region in contact with the active material. The first film preferably includes a region with a thickness of 2 nm or more and 20 nm or less. The first film contains a water-soluble polymer.
    Type: Application
    Filed: December 27, 2019
    Publication date: May 7, 2020
    Inventors: Kai KIMURA, Kazutaka Costellia KURIKI, Teppei OGUNI, Aya UCHIDA (Forme: HITOTSUYANAGI)
  • Patent number: 10541409
    Abstract: A decomposition reaction of an electrolyte solution and the like caused as a side reaction of charge and discharge is minimized in repeated charge and discharge of a lithium ion battery or a lithium ion capacitor, and thus the lithium ion battery or the lithium ion capacitor can have long-term cycle performance. A negative electrode for a power storage device includes a negative electrode current collector and a negative electrode active material layer which includes a plurality of particles of a negative electrode active material. Each of the particles of the negative electrode active material has an inorganic compound film containing a first inorganic compound on part of its surface. The negative electrode active material layer has a film in contact with an exposed part of the negative electrode active material and part of the inorganic compound film. The film contains an organic compound and a second inorganic compound.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: January 21, 2020
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Nobuhiro Inoue, Kai Kimura, Sachiko Kataniwa, Ryota Tajima
  • Patent number: 10529990
    Abstract: A power storage device with high capacity or high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode includes an active material, a first binder, and a second binder. The specific surface area of the active material is S [m2/g]. The weight of the active material, the weight of the first binder, and the weight of the second binder are a, b, and c, respectively. The solution of {(b+c)/(a+b+c)}×100÷S is 0.3 or more. The electrode includes a first film in contact with the active material. The first film preferably includes a region in contact with the active material. The first film preferably includes a region with a thickness of 2 nm or more and 20 nm or less. The first film contains a water-soluble polymer.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: January 7, 2020
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kai Kimura, Kazutaka Kuriki, Teppei Oguni, Aya Uchida
  • Patent number: 10483044
    Abstract: To improve the reliability of a power storage device. A granular active material including carbon is used, and a net-like structure is formed on part of a surface of the granular active material. In the net-like structure, a carbon atom included in the granular active material is bonded to a silicon atom or a metal atom through an oxygen atom. Formation of the net-like structure suppresses reductive decomposition of an electrolyte solution, leading to a reduction in irreversible capacity. A power storage device using the above active material has high cycle performance and high reliability.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: November 19, 2019
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Nobuhiro Inoue, Ryota Tajima, Tamae Moriwaka, Junpei Momo, Teppei Oguni, Kai Kimura, Kazutaka Kuriki, Shunpei Yamazaki
  • Publication number: 20190207203
    Abstract: To provide a power storage device with a high capacity. To provide a power storage device with a high energy density. To provide a highly reliable power storage device. To provide a long-life power storage device. To provide an electrode with a high capacity. To provide an electrode with a high energy density. To provide a highly reliable electrode. To provide a long-life electrode. The power storage device includes a first electrode and a second electrode. The first electrode includes a first current collector and a first active material layer. The first active material layer includes a first active material and a first binder. The first active material is graphite. A separation strength F of the first electrode that is measured when the first active material layer is separated from the first current collector after the first electrode is immersed in a solution at a temperature higher than or equal to 20° C. and lower than or equal to 70° C.
    Type: Application
    Filed: January 24, 2019
    Publication date: July 4, 2019
    Inventors: Kai KIMURA, Tatsuya IKENUMA, Nobuhiro INOUE, Teppei OGUNI
  • Patent number: 10230095
    Abstract: To provide a power storage device with a high capacity. To provide a power storage device with a high energy density. To provide a highly reliable power storage device. To provide a long-life power storage device. To provide an electrode with a high capacity. To provide an electrode with a high energy density. To provide a highly reliable electrode. To provide a long-life electrode. The power storage device includes a first electrode and a second electrode. The first electrode includes a first current collector and a first active material layer. The first active material layer includes a first active material and a first binder. The first active material is graphite. A separation strength F of the first electrode that is measured when the first active material layer is separated from the first current collector after the first electrode is immersed in a solution at a temperature higher than or equal to 20° C. and lower than or equal to 70° C.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: March 12, 2019
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kai Kimura, Tatsuya Ikenuma, Nobuhiro Inoue, Teppei Oguni
  • Patent number: 10128529
    Abstract: A lithium-ion secondary battery with a high capacity retention rate is provided. In addition, a fabricating method of a lithium-ion secondary battery with a high capacity retention rate is provided. The lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. The negative electrode includes a negative electrode active material layer. The electrolyte solution includes at least one of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and lithium bis(fluorosulfonyl)amide (LiFSA). The electrolyte solution includes vinylene carbonate (VC). A coating film including lithium oxide is on a surface of the negative electrode active material layer.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: November 13, 2018
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Ai Nakagawa, Teppei Oguni, Kai Kimura, Rika Yatabe
  • Publication number: 20180190972
    Abstract: A decomposition reaction of an electrolyte solution and the like caused as a side reaction of charge and discharge is minimized in repeated charge and discharge of a lithium ion battery or a lithium ion capacitor, and thus the lithium ion battery or the lithium ion capacitor can have long-term cycle performance. A negative electrode for a power storage device includes a negative electrode current collector and a negative electrode active material layer which includes a plurality of particles of a negative electrode active material. Each of the particles of the negative electrode active material has an inorganic compound film, containing a first inorganic compound on part of its surface. The negative electrode active material layer has a film in contact with an exposed part of the negative electrode active material and part of the inorganic compound film. The film contains an organic compound and a second inorganic compound.
    Type: Application
    Filed: February 28, 2018
    Publication date: July 5, 2018
    Inventors: Nobuhiro INOUE, Kai KIMURA, Sachiko KATANIWA, Ryota TAJIMA
  • Patent number: 9911971
    Abstract: A decomposition reaction of an electrolyte solution and the like caused as a side reaction of charge and discharge is minimized in repeated charge and discharge of a lithium ion battery or a lithium ion capacitor, and thus the lithium ion battery or the lithium ion capacitor can have long-term cycle performance. A negative electrode for a power storage device includes a negative electrode current collector and a negative electrode active material layer which includes a plurality of particles of a negative electrode active material. Each of the particles of the negative electrode active material has an inorganic compound film containing a first inorganic compound on part of its surface. The negative electrode active material layer has a film in contact with an exposed part of the negative electrode active material and part of the inorganic compound film. The film contains an organic compound and a second inorganic compound.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: March 6, 2018
    Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Nobuhiro Inoue, Kai Kimura, Sachiko Kataniwa, Ryota Tajima
  • Publication number: 20180005761
    Abstract: To improve the reliability of a power storage device. A granular active material including carbon is used, and a net-like structure is formed on part of a surface of the granular active material. In the net-like structure, a carbon atom included in the granular active material is bonded to a silicon atom or a metal atom through an oxygen atom. Formation of the net-like structure suppresses reductive decomposition of an electrolyte solution, leading to a reduction in irreversible capacity. A power storage device using the above active material has high cycle performance and high reliability.
    Type: Application
    Filed: August 24, 2017
    Publication date: January 4, 2018
    Inventors: Nobuhiro INOUE, Ryota TAJIMA, Tamae MORIWAKA, Junpei MOMO, Teppei OGUNI, Kai KIMURA, Kazutaka KURIKI, Shunpei YAMAZAKI
  • Publication number: 20170338491
    Abstract: A power storage device with high capacity or high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode includes an active material, a first binder, and a second binder. The specific surface area of the active material is S [m2/g]. The weight of the active material, the weight of the first binder, and the weight of the second binder are a, b, and c, respectively. The solution of {(b+c)/(a+b+c)}×100÷S is 0.3 or more. The electrode includes a first film in contact with the active material. The first film preferably includes a region in contact with the active material. The first film preferably includes a region with a thickness of 2 nm or more and 20 nm or less. The first film contains a water-soluble polymer.
    Type: Application
    Filed: August 4, 2017
    Publication date: November 23, 2017
    Inventors: Kai KIMURA, Kazutaka KURIKI, Teppei OGUNI, Aya UCHIDA (Forme: HITOTSUYANAGI)
  • Patent number: 9806334
    Abstract: Irreversible capacity which causes a decrease in the charge and discharge capacity of a power storage device is reduced, and electrochemical decomposition of an electrolyte solution and the like on a surface of an electrode is inhibited. Further, the cycle characteristics of the power storage device is improved by reducing or inhibiting a decomposition reaction of the electrolyte solution and the like occurring as a side reaction in repeated charging and discharging of the power storage device. A power storage device electrode includes a current collector and an active material layer that is over the current collector and includes a binder and an active material. A coating film is provided on at least part of a surface of the active material. The coating film is spongy.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: October 31, 2017
    Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Kazutaka Kuriki, Kai Kimura, Nobuhiro Inoue, Ryota Tajima, Tamae Moriwaka, Kiyofumi Ogino
  • Publication number: 20170279111
    Abstract: A decomposition reaction of an electrolyte solution and the like caused as a side reaction of charge and discharge is minimized in repeated charge and discharge of a lithium ion battery or a lithium ion capacitor, and thus the lithium ion battery or the lithium ion capacitor can have long-term cycle performance. A negative electrode for a power storage device includes a negative electrode current collector and a negative electrode active material layer which includes a plurality of particles of a negative electrode active material. Each of the particles of the negative electrode active material has an inorganic compound film containing a first inorganic compound on part of its surface. The negative electrode active material layer has a film in contact with an exposed part of the negative electrode active material and part of the inorganic compound film. The film contains an organic compound and a second inorganic compound.
    Type: Application
    Filed: June 9, 2017
    Publication date: September 28, 2017
    Inventors: Nobuhiro INOUE, Kai KIMURA, Sachiko KATANIWA, Ryota TAJIMA
  • Patent number: 9754728
    Abstract: To improve the reliability of a power storage device. A granular active material including carbon is used, and a net-like structure is formed on part of a surface of the granular active material. In the net-like structure, a carbon atom included in the granular active material is bonded to a silicon atom or a metal atom through an oxygen atom. Formation of the net-like structure suppresses reductive decomposition of an electrolyte solution, leading to a reduction in irreversible capacity. A power storage device using the above active material has high cycle performance and high reliability.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: September 5, 2017
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Nobuhiro Inoue, Ryota Tajima, Tamae Moriwaka, Junpei Momo, Teppei Oguni, Kai Kimura, Kazutaka Kuriki, Shunpei Yamazaki
  • Patent number: 9735430
    Abstract: A power storage device with high capacity or high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode includes an active material, a first binder, and a second binder. The specific surface area of the active material is S [m2/g]. The weight of the active material, the weight of the first binder, and the weight of the second binder are a, b, and c, respectively. The solution of {(b+c)/(a+b+c)}×100÷S is 0.3 or more. The electrode includes a first film in contact with the active material. The first film preferably includes a region in contact with the active material. The first film preferably includes a region with a thickness of 2 nm or more and 20 nm or less. The first film contains a water-soluble polymer.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: August 15, 2017
    Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Kai Kimura, Kazutaka Kuriki, Teppei Oguni, Aya Uchida
  • Patent number: 9698412
    Abstract: A decomposition reaction of an electrolyte solution and the like caused as a side reaction of charge and discharge is minimized in repeated charge and discharge of a lithium ion battery or a lithium ion capacitor, and thus the lithium ion battery or the lithium ion capacitor can have long-term cycle performance. A negative electrode for a power storage device includes a negative electrode current collector and a negative electrode active material layer which includes a plurality of particles of a negative electrode active material. Each of the particles of the negative electrode active material has an inorganic compound film containing a first inorganic compound on part of its surface. The negative electrode active material layer has a film in contact with an exposed part of the negative electrode active material and part of the inorganic compound film. The film contains an organic compound and a second inorganic compound.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: July 4, 2017
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Nobuhiro Inoue, Kai Kimura, Sachiko Kataniwa, Ryota Tajima
  • Publication number: 20170141428
    Abstract: A lithium-ion secondary battery with a high capacity retention rate is provided. In addition, a fabricating method of a lithium-ion secondary battery with a high capacity retention rate is provided. The lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. The negative electrode includes a negative electrode active material layer. The electrolyte solution includes at least one of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and lithium bis(fluorosulfonyl)amide (LiFSA). The electrolyte solution includes vinylene carbonate (VC). A coating film including lithium oxide is on a surface of the negative electrode active material layer.
    Type: Application
    Filed: November 9, 2016
    Publication date: May 18, 2017
    Inventors: Ai NAKAGAWA, Teppei OGUNI, Kai KIMURA, Rika YATABE