Patents by Inventor Hidekazu Yamamoto

Hidekazu Yamamoto 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: 10938070
    Abstract: An electrolyte solution, a rechargeable battery including the same and a method of preparing the same are provided. The electrolyte solution includes an electrolytic salt having a concentration of greater than or equal to about 2.0 M (mol/L) and less than or equal to about 5.0 M (mol/L) with respect to the electrolyte solution and a cyclic carbonate-containing solvent. The cyclic carbonate-containing solvent includes a base solvent and a cyclic carbonate. The cyclic carbonate is included in an amount of about 1 volume % to about 15 volume % based on a total volume of the base solvent and the cyclic carbonate. The cyclic carbonate-containing solvent includes a coordination solvent coordinated with an ionized ion from the electrolytic salt and a free solvent that is not coordinated with an ionized ion from the electrolytic salt, and a peak area ratio of the free solvent is from about 1% to about 25%.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: March 2, 2021
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Hidekazu Yamamoto, Tomonobu Mizumo, Kenichi Kawase
  • Publication number: 20190260082
    Abstract: A non-aqueous electrolyte for secondary battery, secondary battery having the same and a method of manufacturing the same are provided. The non-aqueous electrolyte includes an electrolytic salt having an electrolytic salt concentration of about 0.5 M (mol/L) to about 3.8 M (mol/L) in the non-aqueous electrolyte, a first solvent having a solubility of the electrolytic salt in a range from about 100 g to about 400 g, and a second solvent having a solubility of the electrolytic salt of less than or equal to about 1 g. The first solvent includes a coordination solvent coordinated with an ionized ion from the electrolytic salt and a free solvent that is not coordinated with an ionized ion from the electrolytic salt, and a peak area ratio of the free solvent determined by a Raman spectrum is less than about 20%.
    Type: Application
    Filed: February 19, 2019
    Publication date: August 22, 2019
    Inventors: Hidekazu YAMAMOTO, Tomonobu MIZUMO, Kenichi KAWASE
  • Publication number: 20190260083
    Abstract: An electrolyte solution, a rechargeable battery including the same and a method of preparing the same are provided. The electrolyte solution includes an electrolytic salt having a concentration of greater than or equal to about 2.0 M (mol/L) and less than or equal to about 5.0 M (mol/L) with respect to the electrolyte solution and a cyclic carbonate-containing solvent. The cyclic carbonate-containing solvent includes a base solvent and a cyclic carbonate. The cyclic carbonate is included in an amount of about 1 volume % to about 15 volume % based on a total volume of the base solvent and the cyclic carbonate. The cyclic carbonate-containing solvent includes a coordination solvent coordinated with an ionized ion from the electrolytic salt and a free solvent that is not coordinated with an ionized ion from the electrolytic salt, and a peak area ratio of the free solvent is from about 1% to about 25%.
    Type: Application
    Filed: February 19, 2019
    Publication date: August 22, 2019
    Inventors: Hidekazu YAMAMOTO, Tomonobu MIZUMO, Kenichi KAWASE
  • Publication number: 20160286790
    Abstract: A finder function of an imaging unit for taking an entire image including a cornea for transplantation displays a high-quality image. There are provided a support table for supporting an observation container containing a cornea for transplantation as an observed target, a specular optical system that includes a first light source and a first imaging unit, and includes an illuminating optical system and an imaging optical system for acquiring and observing a magnified image of a cornea for transplantation from above or below the observation container in the vertical direction by specular reflection, a second imaging unit for taking an entire image including a region in which the cornea for transplantation is contained from above or below the observation container in the vertical direction, and a switch for selectively switching between the first imaging unit and the second imaging unit to acquire the magnified image and the entire image.
    Type: Application
    Filed: March 30, 2016
    Publication date: October 6, 2016
    Inventors: Hidekazu Yamamoto, Koichi Kondo
  • Patent number: 9153841
    Abstract: Provided is a nonaqueous electrolyte secondary battery which, even in the case of using a low-viscosity solvent having a narrow potential window, can increase the electrochemical stability of the nonaqueous electrolyte solution and suppress side reactions of the nonaqueous electrolyte solution during charge and discharge to reduce the degradation of the battery characteristics and has an excellent storage characteristic in high-temperature environments and a nonaqueous electrolyte solution for the nonaqueous electrolyte secondary battery.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: October 6, 2015
    Assignees: SANYO Electric Co., Ltd., MITSUBISHI CHEMICAL CORPORATION
    Inventors: Hidekazu Yamamoto, Kouhei Tuduki, Taizou Sunano, Maruo Kamino, Youichi Ohashi, Minoru Kotato
  • Publication number: 20150207141
    Abstract: The present invention provides a nonaqueous electrolyte secondary battery which can significantly improve battery characteristics by suppression of decrease in discharge capacity at an initial cycle stage and by improvement in high-temperature charge storage characteristics. A negative electrode for a nonaqueous electrolyte secondary battery has a negative electrode mixture layer including a negative electrode active material which contains SiOx (0.8?x?1.2) and graphite; and a negative electrode collector having at least one surface on which the negative electrode mixture layer is formed, and on the surface of the SiOx, a coating film derived from a compound having an isocyanate group is formed.
    Type: Application
    Filed: August 26, 2013
    Publication date: July 23, 2015
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Shun Nomura, Taisuke Yamamoto, Hidekazu Yamamoto, Atsushi Kaiduka, Naoki Imachi
  • Patent number: 8927158
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode having a positive-electrode active material, a negative electrode having a negative-electrode active material, and a nonaqueous electrolytic solution having a nonaqueous solvent dissolving a solute. The negative-electrode active material includes powdered silicon and/or a silicon alloy, the nonaqueous electrolytic solution includes additives composed of at least one fluorinated lithium phosphate selected from the group consisting of lithium monofluorophosphate, lithium difluorophosphate, and lithium trifluorophosphate and a diisocyanate compound, and the nonaqueous solvent includes a chain carbonate compound.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: January 6, 2015
    Assignees: SANYO Electric Co., Ltd., Mitsubishi Chemical Corporation
    Inventors: Hidekazu Yamamoto, Kouhei Tuduki, Taizou Sunano, Maruo Kamino, Youichi Ohashi, Minoru Kotato
  • Patent number: 8802299
    Abstract: The present invention is made to improve charge-discharge cycle performances under high temperature environment in a non-aqueous electrolyte secondary battery using a negative electrode containing a negative electrode active material of particulate silicon and/or silicon alloy and a binding agent.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: August 12, 2014
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Hidekazu Yamamoto, Atsushi Fukui, Taizou Sunano, Maruo Kamino
  • Patent number: 8673504
    Abstract: The objective of the present invention is to prevent deterioration and expanding of anode active material and to improve charge-discharge cycle characteristics in a non-aqueous electrolyte secondary battery comprising an anode of which current collector has thereon a thin layer of an anode active material containing a metal. To solve this problem, in a non-aqueous electrolyte secondary battery wherein a thin layer of anode active material containing a metal which absorbs and discharges lithium is formed on a current collector and the thin layer of the anode active material is divided into columns by a gap formed along the thickness thereof, a compound represented by the following formula is contained in the non-aqueous electrolyte. A-N?C?O In the above formula, A represents an element or a group other than hydrogen.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: March 18, 2014
    Assignees: SANYO Electric Co., Ltd., Mitsubishi Chemical Corporation
    Inventors: Keiji Saisho, Hidekazu Yamamoto, Masahiro Takehara
  • Publication number: 20130022879
    Abstract: Provided is a nonaqueous electrolyte secondary battery which, even in the case of using a low-viscosity solvent having a narrow potential window, can increase the electrochemical stability of the nonaqueous electrolyte solution and suppress side reactions of the nonaqueous electrolyte solution during charge and discharge to reduce the degradation of the battery characteristics and has an excellent storage characteristic in high-temperature environments and a nonaqueous electrolyte solution for the nonaqueous electrolyte secondary battery.
    Type: Application
    Filed: April 28, 2011
    Publication date: January 24, 2013
    Applicants: MITSUBISHI CHEMICAL CORPORATION, SANYO Electric Co., Ltd.
    Inventors: Hidekazu Yamamoto, Kouhei Tuduki, Taizou Sunano, Maruo Kamino, Youichi Ohashi, Minoru Kotato
  • Publication number: 20130004837
    Abstract: Disclosed is a nonaqueous electrolyte secondary battery which has a negative electrode containing silicon as a negative active material, a positive electrode containing a positive active material, a nonaqueous electrolyte and a separator. Characteristically, an additive which retards oxidation of silicon during operation of the battery is contained either in an interior or surface portion of the positive electrode, in an interior or surface portion of the negative electrode, or in an interior or surface portion of the separator.
    Type: Application
    Filed: September 7, 2012
    Publication date: January 3, 2013
    Inventors: Hidekazu YAMAMOTO, Keiji SAISHO, Yoshio KATO, Shigeki MATSUTA
  • Patent number: 8329563
    Abstract: A device and a device manufacturing process. First, a gettering layer is formed on the bottom surface of a silicon substrate. Gates having a MOS structure are then formed on the principal surface of the silicon substrate, and the gettering layer is removed. According to this manufacturing method, the formation of the gates having a MOS structure is performed such that the gettering layer getters dissolved oxygen present in the silicon substrate. This reduces the concentration of dissolved oxygen in the silicon substrate, resulting in improved device characteristics.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: December 11, 2012
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tadaharu Minato, Hidekazu Yamamoto
  • Patent number: 8283075
    Abstract: A non-aqueous electrolyte secondary battery has a positive electrode (1), a negative electrode (2), a separator (3) interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution in which a solute is dissolved in a non-aqueous solvent. The negative electrode contains a negative electrode active material capable of alloying with lithium and the non-aqueous solvent of the non-aqueous electrolyte solution contains one ore more fluorinated cyclic carbonates and a carboxylic ester. In addition, the non-aqueous electrolyte solution contains a nitrile compound having a chain saturated hydrocarbon group having two or more carbon atoms.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: October 9, 2012
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Hidekazu Yamamoto, Atsushi Fukui, Taizo Sunano, Maruo Kamino
  • Publication number: 20120219868
    Abstract: The objective of the present invention is to prevent deterioration and expanding of anode active material and to improve charge-discharge cycle characteristics in a non-aqueous electrolyte secondary battery comprising an anode of which current collector has thereon a thin layer of an anode active material containing a metal. To solve this problem, in a non-aqueous electrolyte secondary battery wherein a thin layer of anode active material containing a metal which absorbs and discharges lithium is formed on a current collector and the thin layer of the anode active material is divided into columns by a gap formed along the thickness thereof, a compound represented by the following formula is contained in the non-aqueous electrolyte. A-N?C?O In the above formula, A represents an element or a group other than hydrogen.
    Type: Application
    Filed: May 3, 2012
    Publication date: August 30, 2012
    Applicants: Mitsubishi Chemical Corporation, SANYO Electric Co., Ltd.
    Inventors: Keiji SAISHO, Hidekazu Yamamoto, Masahiro Takehara
  • Patent number: 8206853
    Abstract: The objective of the present invention is to prevent deterioration and expanding of anode active material and to improve charge-discharge cycle characteristics in a non-aqueous electrolyte secondary battery comprising an anode of which current collector has thereon a thin layer of an anode active material containing a metal. To solve this problem, in a non-aqueous electrolyte secondary battery wherein a thin layer of anode active material containing a metal which absorbs and discharges lithium is formed on a current collector and the thin layer of the anode active material is divided into columns by a gap formed along the thickness thereof, a compound represented by the following formula is contained in the non-aqueous electrolyte. A-N?C?O In the above formula, A represents an element or a group other than hydrogen.
    Type: Grant
    Filed: June 23, 2006
    Date of Patent: June 26, 2012
    Assignees: SANYO Electric Co., Ltd., Mitsubishi Chemical Corporation
    Inventors: Keiji Saisho, Hidekazu Yamamoto, Masahiro Takehara
  • Publication number: 20120115043
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte solution containing a nonaqueous solvent. The positive electrode active material contains a lithium-containing transition metal oxide represented by general formula (1), Li1+xMnyMzO2 (where x, y, and z satisfy 0<x<0.4, 0<y<1, 0<z<1, and x+y+z=1; and M represents at least one metal element and contains at least one of Ni and Co). The nonaqueous solvent contains a fluorinated cyclic carbonate having two or more fluorine atoms directly bonded to a carbonate ring.
    Type: Application
    Filed: November 9, 2011
    Publication date: May 10, 2012
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Denis Yau Wai YU, Katsunori Yanagida, Hidekazu Yamamoto
  • Publication number: 20110274986
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode having a positive-electrode active material, a negative electrode having a negative-electrode active material, and a nonaqueous electrolytic solution having a nonaqueous solvent dissolving a solute. The negative-electrode active material includes powdered silicon and/or a silicon alloy, the nonaqueous electrolytic solution includes additives composed of at least one fluorinated lithium phosphate selected from the group consisting of lithium monofluorophosphate, lithium difluorophosphate, and lithium trifluorophosphate and a diisocyanate compound, and the nonaqueous solvent includes a chain carbonate compound.
    Type: Application
    Filed: May 9, 2011
    Publication date: November 10, 2011
    Applicants: MITSUBISHI CHEMICAL CORPORATION, SANYO ELECTRIC CO., LTD.
    Inventors: Hidekazu Yamamoto, Kouhei Tuduki, Taizou Sunano, Maruo Kamino, Youichi Ohashi, Minoru Kotato
  • Publication number: 20110217599
    Abstract: Disclosed is a nonaqueous electrolyte secondary battery which has a negative electrode containing silicon as a negative active material, a positive electrode containing a positive active material, a nonaqueous electrolyte and a separator. Characteristically, an additive which retards oxidation of silicon during operation of the battery is contained either in an interior or surface portion of the positive electrode, or in an interior or surface portion of the negative electrode, or in an interior or surface portion of the separator.
    Type: Application
    Filed: April 7, 2011
    Publication date: September 8, 2011
    Inventors: Hidekazu Yamamoto, Keiji Saisho, Yoshio Kato, Shigeki Matsuta
  • Publication number: 20110200887
    Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode (1), a negative electrode (2) containing a negative electrode active material, a separator 3 interposed between the electrodes (1) and (2), and a non-aqueous electrolyte containing a non-aqueous solvent and a solute dissolved in the solvent. The non-aqueous electrolyte contains a compound represented by the following chemical formula (1): wherein n is an integer of from 2 to 6, each R represents a linear saturated hydrocarbon that may be an unsubstituted or may have a substituted group, and the Rs may be the same or different groups.
    Type: Application
    Filed: February 17, 2011
    Publication date: August 18, 2011
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kouhei Tuduki, Hidekazu Yamamoto, Taizou Sunano, Maruo Kamino
  • Publication number: 20110151338
    Abstract: The present invention is made to improve charge-discharge cycle performances under high temperature environment in a non-aqueous electrolyte secondary battery using a negative electrode containing a negative electrode active material of particulate silicon and/or silicon alloy and a binding agent.
    Type: Application
    Filed: August 4, 2009
    Publication date: June 23, 2011
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Hidekazu Yamamoto, Atsushi Fukui, Taizou Sunano, Maruo Kamino