Patents by Inventor Yasuhiro Isshiki

Yasuhiro Isshiki 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: 20230387417
    Abstract: Provided is a new technique that can sufficiently inhibit heat generation in the event of an internal short circuit of an electrochemical device while also reducing IV resistance at low temperature and improving high-temperature storage characteristics of the electrochemical device. A binder composition for an electrochemical device contains a binder and a thermally decomposable material. The thermally decomposable material includes a foaming agent. The thermally decomposable material has a thermal decomposition temperature of 150° C. to 400° C., a number-average particle diameter of 0.01 ?m to 10 ?m, a ratio of the number-average particle diameter relative to volume-average particle diameter of 0.05 to 1, and a circularity of 0.05 to 0.95.
    Type: Application
    Filed: October 26, 2021
    Publication date: November 30, 2023
    Applicant: ZEON CORPORATION
    Inventors: Yasuhiro ISSHIKI, Shiho MOSAKI
  • Publication number: 20230138078
    Abstract: A composite particle for an electrochemical element including an electrode active material and a granular polymer, wherein the granular polymer is composed of a graft polymer, the graft polymer has a molecular structure which includes a specific backbone portion and a graft portion bonded to the backbone portion, the graft portion being a hydrophilic graft chain, a content ratio of the graft portion in the graft polymer is 1 part by weight or more and 40 parts by weight or less relative to 100 parts by weight of the backbone portion, and an angle of repose of the composite particle is 20° to 40°. Also provided are a producing method of the composite particle, an electrode for an electrochemical element including the composite particle, and an electrochemical element including the same.
    Type: Application
    Filed: February 19, 2021
    Publication date: May 4, 2023
    Applicant: ZEON CORPORATION
    Inventor: Yasuhiro ISSHIKI
  • Publication number: 20230081610
    Abstract: Provided is an intercell spacer that can maintain intercell distance even in a situation in which a cell has expanded inside a battery module at abnormally high temperature. The intercell spacer is arranged between battery cells that are adjacent to each other and includes a heat-resistant anti-compression portion having a Young's modulus of not less than a specific value at a specific temperature in a direction in which the battery cells are adjacent.
    Type: Application
    Filed: December 28, 2020
    Publication date: March 16, 2023
    Applicant: ZEON CORPORATION
    Inventors: Akihiko MIYAZAKI, Yasuhiro ISSHIKI, Shiho MOSAKI
  • Publication number: 20230082937
    Abstract: A composite particle for an electrochemical device contains an electrode active material, a conductive material, a binder, and 0.1 parts by mass or more and 5 parts by mass or less of a thermally decomposable foaming agent per 100 parts by mass of the composite particle. When a cross section of the composite particle perpendicular to the long axis of the composite particle, and including the midpoint of the long axis is subjected to a map analysis using an electron beam microanalyzer, the value of the ratio of the integrated values of the detection intensities of carbon atoms contained outside and inside the range of the circle the center of which is coincides with the midpoint of the long axis and the diameter of which is one half of the length of the long axis is 4 or more and 15 or less.
    Type: Application
    Filed: February 16, 2021
    Publication date: March 16, 2023
    Applicant: ZEON CORPORATION
    Inventors: Yasuhiro AKITA, Yasuhiro ISSHIKI
  • Patent number: 11552297
    Abstract: Provided is a binder composition for lithium ion secondary battery electrode-use that reduces internal resistance of a lithium ion secondary battery while also providing the lithium ion secondary battery with excellent life characteristics. The binder composition contains a copolymer X and a solvent. The copolymer X is obtained from a monomer composition X that contains at least 20.0 mass % and no greater than 75.0 mass % of an ethylenically unsaturated carboxylic acid compound (A) composed of either or both of an ethylenically unsaturated carboxylic acid and an ethylenically unsaturated carboxylic acid salt, and at least 20.0 mass % and no greater than 75.0 mass % of a copolymerizable compound (B) that has an ethylenically unsaturated bond and a solubility of at least 7 g in 100 g of water at 20° C. The copolymer X has a degree of swelling in electrolysis solution of less than 120 mass %.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: January 10, 2023
    Assignee: ZEON CORPORATION
    Inventors: Kenya Sonobe, Yusuke Adachi, Takuya Kaneda, Yasuhiro Isshiki
  • Patent number: 11411220
    Abstract: Provided is a binder composition for an electrochemical device that has excellent binding capacity and is capable of forming a functional layer that can improve rate characteristics and cycle characteristics of an electrochemical device (for example, a secondary battery). The binder composition for an electrochemical device contains a binder and an organonitrogen compound. The binder is a polymer including at least one functional group selected from the group consisting of a carboxyl group, a hydroxyl group, a cyano group, an amino group, an epoxy group, an oxazoline group, an isocyanate group, and a sulfo group. The organonitrogen compound includes at least one functional group selected from the group consisting of an azo group, a hydrazino group, a hydrazo group, and a nitroso group, has a 5% mass loss temperature of 140° C. or higher, and has a molecular weight of not less than 80 and not more than 1,000.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: August 9, 2022
    Assignee: ZEON CORPORATION
    Inventors: Yasuhiro Isshiki, Kenya Sonobe, Kazuki Asai
  • Publication number: 20220238883
    Abstract: Provided is a novel technique relating to electrochemical devices that makes it possible to ensure a high level of safety of an electrochemical device while also causing the electrochemical device to display excellent high-temperature storage characteristics. One or more composite particles for an electrochemical device each include a core particle and a shell portion at least partially covering an outer surface of the core particle. The core particle contains a melamine compound, and the shell portion contains an inorganic material.
    Type: Application
    Filed: June 17, 2020
    Publication date: July 28, 2022
    Applicant: ZEON CORPORATION
    Inventors: Maki MESUDA, Kenya SONOBE, Yasuhiro ISSHIKI
  • Patent number: 11387463
    Abstract: Provided is an electrode for an electrochemical device that has excellent peel strength and can ensure a high level of safety of an electrochemical device. The electrode for an electrochemical device includes a current collector and an electrode mixed material layer on the current collector. The electrode mixed material layer contains an electrode active material, a binder, and a foaming agent. The binder is a polymer including a diene monomer unit and/or nitrile group-containing monomer unit, and in which the total proportion constituted by the diene monomer unit and nitrile group-containing monomer unit is 10 mass % to 80 mass %. Volume resistivity RA of a laminate of the electrode mixed material layer and current collector at 25° C. is 0.1 ?·cm to 200 ?·cm, and a ratio of volume resistivity RB of the laminate at 350° C. relative to volume resistivity RA of the laminate at 25° C. is 10 or more.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: July 12, 2022
    Assignee: ZEON CORPORATION
    Inventors: Yasuhiro Isshiki, Kenya Sonobe
  • Publication number: 20220200000
    Abstract: Provided is a new technique related to electrochemical devices that can sufficiently ensure adhesiveness of a functional layer and safety of an electrochemical device while, on the other hand, causing an electrochemical device to display excellent high-temperature storage characteristics. A composite particle for an electrochemical device functional layer includes a core particle containing a melamine compound and a shell polymer that at least partially covers an outer surface of the core particle and that includes at least one selected from the group consisting of a nitrile group, a carboxy group, a hydroxyl group, a sulfo group, an aldehyde group, and an amide group.
    Type: Application
    Filed: March 17, 2020
    Publication date: June 23, 2022
    Applicant: ZEON CORPORATION
    Inventors: Maki MESUDA, Kenya SONOBE, Yasuhiro ISSHIKI
  • Patent number: 11302923
    Abstract: Provided is an additive for an electrochemical device that can ensure a high level of safety of an electrochemical device. The additive for an electrochemical device is an additive for an electrochemical device that is used in an electrochemical device, for which a temperature at which a volume expansion ratio thereof reaches a factor of 2 or more is higher than 150° C. and lower than 400° C., and in which the content of (A) each element belonging to group 2 of the periodic table is less than 100 mass ppm, the content of (B) each element belonging to group 17 of the periodic table is less than 100 mass ppm, and the content of (C) each element among Cr, Mn, Fe, Co, Ni, Cu, and Zn is less than 5 mass ppm.
    Type: Grant
    Filed: January 10, 2019
    Date of Patent: April 12, 2022
    Assignee: ZEON CORPORATION
    Inventors: Kenya Sonobe, Yasuhiro Isshiki
  • Publication number: 20220037632
    Abstract: A conductive paste for an electrode mixed material layer has a water content of 1,000 ppm or less. The paste contains a conductive additive, not less than 3 parts by mass and not more than 200 parts by mass of a polymer per 100 parts by mass of the conductive additive, and not less than 12 parts by mass and not more than 350 parts by mass of expandable particles per 100 parts by mass of the conductive additive. The polymer includes at least one functional group selected from the group consisting of a carboxyl group, a hydroxyl group, an amino group, an epoxy group, an oxazoline group, a sulfo group, a nitrile group, an ester group, and an amide group. The expandable particles have an initial thermal decomposition temperature of not lower than 120° C. and not higher than 400° C.
    Type: Application
    Filed: October 3, 2019
    Publication date: February 3, 2022
    Applicant: ZEON CORPORATION
    Inventors: Kenya SONOBE, Yasuhiro ISSHIKI, Maki MESUDA
  • Publication number: 20210057747
    Abstract: Provided is an additive for an electrochemical device that can ensure a high level of safety of an electrochemical device. The additive for an electrochemical device is an additive for an electrochemical device that is used in an electrochemical device, for which a temperature at which a volume expansion ratio thereof reaches a factor of 2 or more is higher than 150° C. and lower than 400° C., and in which the content of (A) each element belonging to group 2 of the periodic table is less than 100 mass ppm, the content of (B) each element belonging to group 17 of the periodic table is less than 100 mass ppm, and the content of (C) each element among Cr, Mn, Fe, Co, Ni, Cu, and Zn is less than 5 mass ppm.
    Type: Application
    Filed: January 10, 2019
    Publication date: February 25, 2021
    Applicant: ZEON CORPORATION
    Inventors: Kenya SONOBE, Yasuhiro ISSHIKI
  • Publication number: 20210057725
    Abstract: Provided is a slurry composition for a lithium ion secondary battery that can cause an electrode for a lithium ion secondary battery to display excellent adhesiveness (peel strength) and flexibility (pliability) and that can cause a lithium ion secondary battery to display excellent rate characteristics and cycle characteristics. The slurry composition for a lithium ion secondary battery contains a silicon compound and a binder. The silicon compound includes either or both of Li2SiO3 and Li4SiO4. The binder includes a water-soluble polymer that includes either or both of an ethylenically unsaturated carboxylic acid monomer unit (A) and an alkali metal salt thereof, and that includes a cross-linkable monomer unit (B). A 1 mass % aqueous solution of the water-soluble polymer has a viscosity of 1,000 mPa·s or less. The slurry composition for a lithium ion secondary battery has a pH of not lower than 9 and not higher than 12.
    Type: Application
    Filed: February 19, 2019
    Publication date: February 25, 2021
    Applicant: ZEON CORPORATION
    Inventor: Yasuhiro ISSHIKI
  • Publication number: 20200295372
    Abstract: Provided is a binder composition for a secondary battery with which a slurry composition for a secondary battery having low foaming can be produced, and that can improve handleability of a functional layer or electrode layer formed using the produced slurry composition for a secondary battery. The binder composition for a secondary battery contains a polymer A and a solvent. The polymer A includes an amide group-containing monomer unit and a carboxylic acid ester-containing monomer unit including an alkyl chain having a carbon number of not less than 2 and not more than 9. Content of the carboxylic acid ester-containing monomer unit in the polymer A is not less than 12 mass % and not more than 28 mass %.
    Type: Application
    Filed: September 27, 2018
    Publication date: September 17, 2020
    Applicant: ZEON CORPORATION
    Inventors: Yusuke ADACHI, Kenya SONOBE, Yasuhiro ISSHIKI, Ai MASUDA
  • Publication number: 20200220174
    Abstract: Provided is a binder composition for an electrochemical device that has excellent binding capacity and is capable of forming a functional layer that can improve rate characteristics and cycle characteristics of an electrochemical device (for example, a secondary battery). The binder composition for an electrochemical device contains a binder and an organonitrogen compound. The binder is a polymer including at least one functional group selected from the group consisting of a carboxyl group, a hydroxyl group, a cyano group, an amino group, an epoxy group, an oxazoline group, an isocyanate group, and a sulfo group. The organonitrogen compound includes at least one functional group selected from the group consisting of an azo group, a hydrazino group, a hydrazo group, and a nitroso group, has a 5% mass loss temperature of 140° C. or higher, and has a molecular weight of not less than 80 and not more than 1,000.
    Type: Application
    Filed: June 29, 2018
    Publication date: July 9, 2020
    Applicant: ZEON CORPORATION
    Inventors: Yasuhiro ISSHIKI, Kenya SONOBE, Kazuki ASAI
  • Publication number: 20200176782
    Abstract: Provided is an electrode for an electrochemical device that has excellent peel strength and can ensure a high level of safety of an electrochemical device. The electrode for an electrochemical device includes a current collector and an electrode mixed material layer on the current collector. The electrode mixed material layer contains an electrode active material, a binder, and a foaming agent. The binder is a polymer including a diene monomer unit and/or nitrile group-containing monomer unit, and in which the total proportion constituted by the diene monomer unit and nitrile group-containing monomer unit is 10 mass % to 80 mass %. Volume resistivity RA of a laminate of the electrode mixed material layer and current collector at 25° C. is 0.1 ?·cm to 200 ?·cm, and a ratio of volume resistivity RB of the laminate at 350° C. relative to volume resistivity RA of the laminate at 25° C. is 10 or more.
    Type: Application
    Filed: July 17, 2018
    Publication date: June 4, 2020
    Applicant: ZEON CORPORATION
    Inventors: Yasuhiro ISSHIKI, Kenya SONOBE
  • Patent number: 10044026
    Abstract: A material for slurry composition-use for example is a paste composition including a negative electrode active material that contains a silicon-based negative electrode active material in an amount of at least 30 mass % and a water-soluble polymer in an amount of at least 3 parts by mass and less than 500 parts by mass per 100 parts by mass of the silicon-based negative electrode active material. The water-soluble polymer includes at least 20.0 mass % and no greater than 79.5 mass % of structural units derived from an ethylenically unsaturated carboxylic acid compound (A) and at least 20.0 mass % and no greater than 79.5 mass % of structural units derived from a copolymerizable compound (B) that has an ethylenically unsaturated bond and a water solubility of at least 7 g/100 g at 20° C., and the water-soluble polymer has a degree of swelling in electrolysis solution of less than 120%.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: August 7, 2018
    Assignee: ZEON CORPORATION
    Inventors: Kenya Sonobe, Yasuhiro Isshiki, Masanori Shibuya
  • Publication number: 20170244095
    Abstract: A material for slurry composition-use for example is a paste composition including a negative electrode active material that contains a silicon-based negative electrode active material in an amount of at least 30 mass % and a water-soluble polymer in an amount of at least 3 parts by mass and less than 500 parts by mass per 100 parts by mass of the silicon-based negative electrode active material. The water-soluble polymer includes at least 20.0 mass % and no greater than 79.5 mass % of structural units derived from an ethylenically unsaturated carboxylic acid compound (A) and at least 20.0 mass % and no greater than 79.5 mass % of structural units derived from a copolymerizable compound (B) that has an ethylenically unsaturated bond and a water solubility of at least 7 g/100 g at 20° C., and the water-soluble polymer has a degree of swelling in electrolysis solution of less than 120%.
    Type: Application
    Filed: October 30, 2015
    Publication date: August 24, 2017
    Applicant: ZEON CORPORATION
    Inventors: Kenya SONOBE, Yasuhiro ISSHIKI, Masanori SHIBUYA
  • Publication number: 20170062828
    Abstract: Provided is a binder composition for lithium ion secondary battery electrode-use that reduces internal resistance of a lithium ion secondary battery while also providing the lithium ion secondary battery with excellent life characteristics. The binder composition contains a copolymer X and a solvent. The copolymer X is obtained from a monomer composition X that contains at least 20.0 mass % and no greater than 75.0 mass % of an ethylenically unsaturated carboxylic acid compound (A) composed of either or both of an ethylenically unsaturated carboxylic acid and an ethylenically unsaturated carboxylic acid salt, and at least 20.0 mass % and no greater than 75.0 mass % of a copolymerizable compound (B) that has an ethylenically unsaturated bond and a solubility of at least 7 g in 100 g of water at 20° C. The copolymer X has a degree of swelling in electrolysis solution of less than 120 mass %.
    Type: Application
    Filed: June 4, 2015
    Publication date: March 2, 2017
    Applicant: ZEON CORPORATION
    Inventors: Kenya SONOBE, Yusuke ADACHI, Takuya KANEDA, Yasuhiro ISSHIKI
  • Patent number: 9306208
    Abstract: Disclosed is a manufacturing method of an electrode for an electrochemical element having a superior adhesion and is used for an electrochemical element with excellent productivity due to a short predoping time. Specifically disclosed is that the method is characterized by comprising a step for compression forming of electrode material (a mixed powder or composite particles) including an alkaline metal powder or an alkaline earth metal powder each having a coated surface.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: April 5, 2016
    Assignee: ZEON CORPORATION
    Inventors: Yasuhiro Isshiki, Yasuhiro Wakizaka