Patents by Inventor Kazuhei NARITA

Kazuhei NARITA 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).

  • Publication number: 20210184214
    Abstract: A conduction path in an all-solid-state secondary battery is difficult to keep with a volume change in an active material due to charging and discharging in some cases. A positive electrode active material with a small volume change between the charged state and the discharged state is used for an all-solid-state secondary battery. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a crystal structure similar to the cadmium chloride type crystal structure in the charged state with a depth of charge of approximately 0.8 changes less in its volume and crystal structure between charging and discharging than known positive electrode active materials.
    Type: Application
    Filed: November 16, 2018
    Publication date: June 17, 2021
    Inventors: Mayumi MIKAMI, Yohei MOMMA, Kazutaka KURIKI, Kazuhei NARITA
  • Patent number: 11038207
    Abstract: Provided is a power storage device whose charging and discharging characteristics are unlikely to be degraded by heat treatment or a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolyte, and an exterior body. The separator is positioned between the positive electrode and the negative electrode and includes polyphenylene sulfide or cellulosic fiber. The electrolyte includes propylene carbonate, ethylene carbonate, and vinylene carbonate, lithium hexafluorophosphate, and lithium bis(pentafluoroethanesulfonyl)amide. A concentration of lithium hexafluorophosphate with respect to the electrolyte is more than or equal to 0.01 wt % and less than or equal to 1.9 wt % in a weight ratio.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: June 15, 2021
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kazuhei Narita, Ryota Tajima
  • Publication number: 20210175573
    Abstract: A battery module with high impact resistance is provided. A battery module using an elastic body such as rubber for its exterior body covering a battery is provided. A bendable battery module is provided. As the exterior body covering a battery, an elastic body such as rubber is used, and the exterior body is molded in two steps. First, a first portion provided with a depression in which a battery is stored is molded using a first mold. Next, a battery is inserted into the first portion. Subsequently, second molding is performed using a second mold so as to fill an opening of the depression in the first portion, so that a second portion is formed. The second portion serves as a cover for closing the opening of the depression in the first portion. The second portion is formed in contact with part of the electrodes in the battery and part of an end portion of the second exterior body in the battery.
    Type: Application
    Filed: February 19, 2021
    Publication date: June 10, 2021
    Inventors: Ryota TAJIMA, Kazuhei NARITA, Kensuke YOSHIZUMI
  • Publication number: 20210143404
    Abstract: A method for manufacturing a lithium-ion secondary battery more safely at a lower cost is provided. A method for manufacturing a positive electrode for a secondary battery includes a step of forming slurry by mixing graphene oxide, a binder, and a positive electrode active material in a solvent containing water; a step of applying the slurry on a positive electrode current collector; and a step of reducing graphene oxide by at least one of chemical reduction and thermal reduction. As a reducing agent for the chemical reduction, ascorbic acid can be used.
    Type: Application
    Filed: November 2, 2020
    Publication date: May 13, 2021
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Mayumi MIKAMI, Kazuhei NARITA, Teruaki OCHIAI, Yumiko YONEDA
  • Patent number: 10930904
    Abstract: A battery module with high impact resistance is provided. A battery module using an elastic body such as rubber for its exterior body covering a battery is provided. A bendable battery module is provided. As the exterior body covering a battery, an elastic body such as rubber is used, and the exterior body is molded in two steps. First, a first portion provided with a depression in which a battery is stored is molded using a first mold. Next, a battery is inserted into the first portion. Subsequently, second molding is performed using a second mold so as to fill an opening of the depression in the first portion, so that a second portion is formed. The second portion serves as a cover for closing the opening of the depression in the first portion. The second portion is formed in contact with part of the electrodes in the battery and part of an end portion of the second exterior body in the battery.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: February 23, 2021
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Ryota Tajima, Kazuhei Narita, Kensuke Yoshizumi
  • Publication number: 20210020928
    Abstract: A negative electrode active material with high capacity and excellent cycle performance and rate performance is provided. In addition, a secondary battery including the negative electrode active material, and an electronic device including the secondary battery are provided. Nanosilicon is mixed with a solid electrolyte containing lithium, titanium, phosphorus, and oxygen, and graphene oxide is further added thereto. Then, graphene oxide contained in the mixture is reduced with ethanol in which ascorbic acid and lithium hydroxide hydrate are dissolved, so that the negative electrode active material is manufactured.
    Type: Application
    Filed: March 26, 2019
    Publication date: January 21, 2021
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Mayumi MIKAMI, Jun ISHIKAWA, Miku FUJITA, Kazuhei NARITA
  • Publication number: 20200280101
    Abstract: A storage battery includes positive and negative electrodes and an electrolytic solution. The negative electrode includes a first element and carbon. The first element is any of silicon, tin, gallium, aluminum, germanium, lead, antimony, bismuth, silver, zinc, cadmium, and indium. The negative electrode includes an active material and a first layer in contact with a surface of the active material. The first layer has a thickness of 10 nm to 1000 nm inclusive. The electrolytic solution contains first and second cations. The first cation is one or more of a lithium ion, a sodium ion, a calcium ion, and a magnesium ion. The second cation is an imidazolium cation or a tertiary sulfonium cation.
    Type: Application
    Filed: May 15, 2020
    Publication date: September 3, 2020
    Inventors: Nobuhiro INOUE, Masaki YAMAKAJI, Jun ISHIKAWA, Kazuhei NARITA
  • Patent number: 10658701
    Abstract: A storage battery includes positive and negative electrodes and an electrolytic solution. The negative electrode includes a first element and carbon. The first element is any of silicon, tin, gallium, aluminum, germanium, lead, antimony, bismuth, silver, zinc, cadmium, and indium. The negative electrode includes an active material and a first layer in contact with a surface of the active material. The first layer has a thickness of 10 nm to 1000 nm inclusive. The electrolytic solution contains first and second cations. The first cation is one or more of a lithium ion, a sodium ion, a calcium ion, and a magnesium ion. The second cation is an imidazolium cation or a tertiary sulfonium cation.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: May 19, 2020
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Nobuhiro Inoue, Masaki Yamakaji, Jun Ishikawa, Kazuhei Narita
  • Publication number: 20200112061
    Abstract: To provide a power storage device whose charge and discharge characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiBETA. One of the solvents is propylene carbonate.
    Type: Application
    Filed: December 5, 2019
    Publication date: April 9, 2020
    Inventors: Kazuhei NARITA, Ryota TAJIMA, Teppei OGUNI
  • Patent number: 10535899
    Abstract: To provide a power storage device whose charge and discharge characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber. The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiBETA. One of the solvents is propylene carbonate.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: January 14, 2020
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kazuhei Narita, Ryota Tajima, Teppei Oguni
  • Patent number: 10497979
    Abstract: A power storage device with high capacity is provided. Alternatively, a power storage device with high energy density is provided. Alternatively, a highly reliable power storage device is provided. Alternatively, a long-life power storage device is provided. A power storage device is characterized by comprising a separator, a first electrode, a second electrode, an electrolytic solution, in which the separator is provided between the first electrode and the second electrode, the first electrode includes an active material layer and a current collector, the first electrode includes a pair of coating films between which the current collector is sandwiched, the active material layer includes a region in contact with the current collector, the active material layer includes a region in contact with at least one of the pair of coating films, and the electrolytic solution includes an alkali metal salt and an ionic liquid.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: December 3, 2019
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Jun Ishikawa, Kazuhei Narita, Teppei Oguni, Aya Uchida
  • Publication number: 20190280337
    Abstract: Provided is a power storage device whose charging and discharging characteristics are unlikely to be degraded by heat treatment or a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolyte, and an exterior body. The separator is positioned between the positive electrode and the negative electrode and includes polyphenylene sulfide or cellulosic fiber. The electrolyte includes propylene carbonate, ethylene carbonate, and vinylene carbonate, lithium hexafluorophosphate, and lithium bis(pentafluoroethanesulfonyl)amide. A concentration of lithium hexafluorophosphate with respect to the electrolyte is more than or equal to 0.01 wt % and less than or equal to 1.9 wt % in a weight ratio.
    Type: Application
    Filed: November 22, 2017
    Publication date: September 12, 2019
    Inventors: Kazuhei NARITA, Ryota TAJIMA
  • Patent number: 10158108
    Abstract: When cellulose is used as a separator, the cellulose is impregnated with an ionic liquid. Charge and discharge are repeated with this separator touching a surface of a current collector; then, the separator is changed in color. Thus, it is an object to provide a power storage device with a structure in which a side reaction other than a battery reaction, e.g., a change in color of separator, is unlikely to occur. In the power storage device, a separator impregnated with an ionic liquid is not in contact with a surface of a current collector. The separator has a tubular shape, a bag-like shape, or a sheet-like shape. The separator includes cellulose. The power storage device including the ionic liquid is non-volatile and non-flammable. The power storage device can be bent.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: December 18, 2018
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Kazuhei Narita, Jun Ishikawa, Teppei Oguni, Aya Uchida
  • Publication number: 20180233780
    Abstract: A power storage device with high capacity is provided. Alternatively, a power storage device with high energy density is provided. Alternatively, a highly reliable power storage device is provided. Alternatively, a long-life power storage device is provided. A power storage device is characterized by comprising a separator, a first electrode, a second electrode, an electrolytic solution, in which the separator is provided between the first electrode and the second electrode, the first electrode includes an active material layer and a current collector, the first electrode includes a pair of coating films between which the current collector is sandwiched, the active material layer includes a region in contact with the current collector, the active material layer includes a region in contact with at least one of the pair of coating films, and the electrolytic solution includes an alkali metal salt and an ionic liquid.
    Type: Application
    Filed: September 30, 2015
    Publication date: August 16, 2018
    Inventors: Jun ISHIKAWA, Kazuhei NARITA, Teppei OGUNI, Aya UCHIDA
  • Publication number: 20170301896
    Abstract: A battery module with high impact resistance is provided. A battery module using an elastic body such as rubber for its exterior body covering a battery is provided. A bendable battery module is provided. As the exterior body covering a battery, an elastic body such as rubber is used, and the exterior body is molded in two steps. First, a first portion provided with a depression in which a battery is stored is molded using a first mold. Next, a battery is inserted into the first portion. Subsequently, second molding is performed using a second mold so as to fill an opening of the depression in the first portion, so that a second portion is formed. The second portion serves as a cover for closing the opening of the depression in the first portion. The second portion is formed in contact with part of the electrodes in the battery and part of an end portion of the second exterior body in the battery.
    Type: Application
    Filed: March 28, 2017
    Publication date: October 19, 2017
    Inventors: Ryota TAJIMA, Kazuhei NARITA, Kensuke YOSHIZUMI
  • Publication number: 20170237127
    Abstract: A power storage device with a high capacity is provided. A power storage device with a high energy density is provided. A highly reliable power storage device is provided. A power storage device with a long lifetime is provided. A method for manufacturing an electrode is characterized by including the steps of: mixing an active material, a binder, and a conductive additive to form a slurry; applying the slurry onto a current collector; drying the applied slurry to form an active material layer; and performing heat treatment in an atmosphere containing oxygen to form a film in contact with the current collector. The film is formed on a surface of the current collector where the active material layer is not provided and includes at least one component of the current collector and oxygen.
    Type: Application
    Filed: October 15, 2015
    Publication date: August 17, 2017
    Inventors: Jun ISHIKAWA, Kazuhei NARITA, Teppei OGUNI, Aya UCHIDA
  • Publication number: 20170222265
    Abstract: A storage battery includes positive and negative electrodes and an electrolytic solution. The negative electrode includes a first element and carbon. The first element is any of silicon, tin, gallium, aluminum, germanium, lead, antimony, bismuth, silver, zinc, cadmium, and indium. The negative electrode includes an active material and a first layer in contact with a surface of the active material. The first layer has a thickness of 10 nm to 1000 nm inclusive. The electrolytic solution contains first and second cations. The first cation is one or more of a lithium ion, a sodium ion, a calcium ion, and a magnesium ion. The second cation is an imidazolium cation or a tertiary sulfonium cation.
    Type: Application
    Filed: January 17, 2017
    Publication date: August 3, 2017
    Inventors: Nobuhiro INOUE, Masaki YAMAKAJI, Jun ISHIKAWA, Kazuhei NARITA
  • Publication number: 20170170521
    Abstract: To provide a power storage device whose charge and discharge characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber. The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiBETA. One of the solvents is propylene carbonate.
    Type: Application
    Filed: December 7, 2016
    Publication date: June 15, 2017
    Inventors: Kazuhei NARITA, Ryota TAJIMA, Teppei OGUNI
  • Publication number: 20170117589
    Abstract: To provide a power storage device whose charging and discharging characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide. The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiFSA at a concentration of higher than or equal to 0.1 wt % and lower than or equal to 50 wt % in the electrolytic solution. One of the solvents is propylene carbonate.
    Type: Application
    Filed: October 26, 2016
    Publication date: April 27, 2017
    Inventors: Ryota TAJIMA, Teppei OGUNI, Kazuhei NARITA, Junya GOTO, Ai NAKAGAWA, Minoru TAKAHASHI
  • Publication number: 20160268064
    Abstract: To provide a power storage device exhibiting excellent charge and discharge characteristics at high temperature. To provide a power storage device exhibiting excellent charge and discharge characteristics at a wide range of temperature. Such a power storage device includes a positive electrode, a negative electrode, a separator, and an electrolytic solution. The separator is located between the positive electrode and the negative electrode and contains polyphenylene sulfide. The electrolytic solution contains an ionic liquid and an alkali metal salt.
    Type: Application
    Filed: February 29, 2016
    Publication date: September 15, 2016
    Inventors: Jun ISHIKAWA, Kazuhei NARITA, Teppei OGUNI