Patents by Inventor Yasunobu Iwami

Yasunobu Iwami 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: 20220246923
    Abstract: The purpose of the present disclosure is to improve the cycle characteristics of a secondary battery that uses an Si-based active material containing Si. A negative electrode active material (Si-based active material) for secondary batteries according to one embodiment of the present invention comprises core particles, each of which is obtained by dispersing Si particles in a silicon oxide phase or a silicate phase, and a carbon material that adheres to the surfaces of the core particles. If a D/G ratio is the ratio of the peak intensity of the D-band to the peak intensity of the G-band in the Raman spectrum, the carbon material contains a first carbon material that has a D/G ratio of from 0.8 to 2 and a second carbon material that has a D/G ratio of from 0.01 to 0.5. The D/G ratio of the carbon material is from 0.2 to 0.9.
    Type: Application
    Filed: June 24, 2020
    Publication date: August 4, 2022
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Isao Koizumi, Yasunobu Iwami, Takaharu Morikawa
  • Publication number: 20220149377
    Abstract: The purpose of the present disclosure is to provide a slurry for a non-aqueous electrolyte secondary cell capable of obtaining an electrode mixture layer showing excellent adhesion with a current collector. The slurry for a non-aqueous electrolyte secondary cell, which is one mode of the present disclosure, contains: an electrode mixture containing an electrode active material, lithium carbonate, and carboxymethylcellulose or a salt thereof; and water. The lithium carbonate content is in the range of 33 to 300 ppm with respect to the total mass of the electrode mixture.
    Type: Application
    Filed: February 21, 2020
    Publication date: May 12, 2022
    Applicants: Panasonic Corporation, SANYO Electric Co., Ltd.
    Inventors: Yasunobu Iwami, Takaharu Morikawa, Toshiyuki Nakamori, Tomohiro Ichikawa
  • Publication number: 20220037643
    Abstract: The purpose of the present invention is to provide a nonaqueous electrolyte secondary battery which has excellent charge/discharge cycle characteristics. A nonaqueous electrolyte secondary battery negative electrode which is an example of an embodiment of the present invention comprises, as negative electrode active materials, a carbon active material and a Si active material comprising Si particles dispersed in an oxide phase containing at least silicon (Si). The Si active material includes a first Si active material and a second Si active material. The first Si active material has a median size on a volume basis that is greater than that of the second Si active material and has an Si particle content that is higher than that of the second Si active material.
    Type: Application
    Filed: September 10, 2019
    Publication date: February 3, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yasunobu Iwami, Nobumichi Nishida, Takaharu Morikawa, Mai Yokoi, Toshiyuki Nakamori
  • Publication number: 20210167372
    Abstract: A negative electrode active material according to one embodiment of the present disclosure comprises: a composite oxide phase that contains Li, Si, Al and B; and Si particles that are dispersed in the composite oxide phase. Relative to the total number of moles of elements (excluding O) contained in the composite, oxide phase, the content of Li is from 5% by mole to 20% by mole (inclusive), the content of Si is from 50% by mole to 70% by mole (inclusive), the content of Al is from 12% by mole to 25% by mole (inclusive), and the content of B is from 12% by mole to 25% by mole (inclusive).
    Type: Application
    Filed: August 1, 2019
    Publication date: June 3, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Toshiyuki Nakamori, Yasunobu Iwami, Mai Yokoi, Yohei Uchiyama
  • Patent number: 10490812
    Abstract: A negative electrode for nonaqueous electrolyte secondary batteries is provided which includes SiOx and allows the cycle characteristics of batteries to be enhanced. A negative electrode according to an example embodiment includes a negative electrode current collector and a negative electrode mixture layer disposed on the current collector. The negative electrode mixture layer includes SiOx (0.5?x?1.5) particles having a carbon coating on a particle surface, carbonaceous active material particles, and a compound having at least one of a carboxyl group and a hydroxyl group and having an average number of etherifying agent moieties present per unit molecule of not more than 0.8. The carbon coating includes a first coating disposed on the surface of the SiOx and a second coating disposed on the first coating and including carbon having higher crystallinity than the carbon forming the first coating.
    Type: Grant
    Filed: February 15, 2016
    Date of Patent: November 26, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Mai Yokoi, Yasunobu Iwami, Taizou Sunano
  • Publication number: 20180040886
    Abstract: A negative electrode for nonaqueous electrolyte secondary batteries is provided which includes SiOx and allows the cycle characteristics of batteries to be enhanced. A negative electrode according to an example embodiment includes a negative electrode current collector and a negative electrode mixture layer disposed on the current collector. The negative electrode mixture layer includes SiOx (0.5?x?1.5) particles having a carbon coating on a particle surface, carbonaceous active material particles, and a compound having at least one of a carboxyl group and a hydroxyl group and having an average number of etherifying agent moieties present per unit molecule of not more than 0.8. The carbon coating includes a first coating disposed on the surface of the SiOx and a second coating disposed on the first coating and including carbon having higher crystallinity than the carbon forming the first coating.
    Type: Application
    Filed: February 15, 2016
    Publication date: February 8, 2018
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Mai Yokoi, Yasunobu Iwami, Taizou Sunano
  • Patent number: 9640798
    Abstract: A nonaqueous electrolyte secondary battery according to one aspect of the present invention contains a dispersant in a positive electrode mixture layer. The content of a positive electrode active material in the positive electrode mixture layer is 97% by mass or more, and the content ratio of a conductive agent to a binder in the positive electrode mixture layer is 1.00-1.67. The binder is composed of a polyvinylidene fluoride which has a carboxyl group or a carboxyl group derivative as a terminal functional group.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: May 2, 2017
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Masanori Maekawa, Yasunobu Iwami, Akira Kinoshita
  • Publication number: 20170084910
    Abstract: A negative electrode plate for nonaqueous electrolyte secondary batteries according to an embodiment of the present invention includes a negative electrode mix layer, placed on a negative electrode core, containing a negative electrode active material capable of storing and releasing lithium ions. The negative electrode core is copper foil having a thickness of 5.9 ?m to 8.1 ?m and a surface roughness Rz of 0.8 ?m to 1.5 ?m. The negative electrode mix layer contains the negative electrode active material, a binding agent, and a carboxymethylcellulose-ammonium salt. The negative electrode active material is composed of a mixture of a graphite material and a silicon oxide represented by SiOx (0.5?x<1.6). The content of the silicon oxide in the negative electrode active material is 0.5% to 20% by mass.
    Type: Application
    Filed: March 18, 2015
    Publication date: March 23, 2017
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Tomohiro Ichikawa, Yasunobu Iwami, Katsuya Imai
  • Publication number: 20170012290
    Abstract: The cycle characteristics of nonaqueous electrolyte secondary batteries are improved. A negative electrode for nonaqueous electrolyte secondary batteries includes a negative electrode mixture layer on a negative electrode collector. The negative electrode mixture layer contains SiOX (0.5?X?1.5) particles and graphite particles, and the SiOX particles are covered with a cellulose-containing material. The negative electrode mixture layer contains a thickener and a binder, and the thickener contains at least one of a carboxyalkyl cellulose, a hydroxyalkyl cellulose, and an alkoxycellulose each having a degree of etherification of 0.8 or more.
    Type: Application
    Filed: January 27, 2015
    Publication date: January 12, 2017
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Yasunori Watanabe, Satoshi Yamamoto, Yasunobu Iwami, Taizou Sunano
  • Publication number: 20160351906
    Abstract: The high-temperature storage characteristics of nonaqueous electrolyte secondary batteries are improved. A negative electrode for nonaqueous electrolyte secondary batteries includes a negative electrode collector and a negative electrode mixture layer. The negative electrode mixture layer contains silicon-containing particles, graphite particles, and carboxymethyl cellulose ammonium salt, and the amount of NH3 in the negative electrode mixture layer is 350 ?g or less per g of the negative electrode mixture layer. The silicon-containing particles preferably have a conductive carbon material layer with which at least part of the surfaces thereof is covered. The silicon-containing particles preferably include SiOX (0.5?X?1.5) particles.
    Type: Application
    Filed: January 20, 2015
    Publication date: December 1, 2016
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Mai Yokoi, Satoshi Yamamoto, Yasunobu Iwami, Toshiyuki Nakamori, Taizou Sunano
  • Publication number: 20150270553
    Abstract: A nonaqueous electrolyte secondary battery according to one aspect of the present invention contains a dispersant in a positive electrode mixture layer. The content of a positive electrode active material in the positive electrode mixture layer is 97% by mass or more, and the content ratio of a conductive agent to a binder in the positive electrode mixture layer is 1.00-1.67. The binder is composed of a polyvinylidene fluoride which has a carboxyl group or a carboxyl group derivative as a terminal functional group.
    Type: Application
    Filed: October 25, 2013
    Publication date: September 24, 2015
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Masanori Maekawa, Yasunobu Iwami, Akira Kinoshita
  • Publication number: 20140356724
    Abstract: A non-aqueous electrolyte secondary battery comprising a positive electrode plate, a negative electrode being provided with a negative electrode plate mixture layer containing a negative electrode active material, a separator; and a non-aqueous electrolyte. The negative electrode active material is a mixture of at least one of metal silicon and silicon oxide expressed by SiOx (0.5?x<1.6) , and graphite material. And the graphite material includes coated graphite material coated with amorphous carbon in the ratio of equal to or more than 20% by mass, and equal to or less than 90% by mass to all the graphite material, and the ratio of the metal silicon and the silicon oxide to all the negative electrode active material is equal to or more than 1% by mass and equal to or more than 20% by mass.
    Type: Application
    Filed: December 20, 2012
    Publication date: December 4, 2014
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventor: Yasunobu Iwami
  • Publication number: 20100248022
    Abstract: The nonaqueous electrolyte secondary battery having high output characteristics and excellent safety when overcharging as well as excellent charge and discharge cycle characteristics according to an aspect of the invention includes a positive electrode having a positive electrode active material, a negative electrode having a negative electrode active material, a separator, and a nonaqueous electrolyte. The positive electrode active material includes lithium iron phosphate having an olivine crystal structure represented by General Formula LixFePO4 (where x is 0<x<1.3), the negative electrode active material includes a carbon material having an average operating potential of 0.3 V or less based on lithium in a range of 10 to 30% depth of discharge at the time of discharging at 6 mA/cm2, and the nonaqueous electrolyte includes an alkoxybenzene derivative within a range of 0.1 to 5.0% by mass.
    Type: Application
    Filed: March 11, 2010
    Publication date: September 30, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Hironori Shirakata, Yasunobu Iwami, Masato Iwanaga
  • Publication number: 20090008237
    Abstract: Provided is a method for producing an active material for a lithium secondary battery to enable efficient removal of iron impurities, which would become a problem in production of an active material for a lithium secondary battery, and attain a high quality. The method includes removing iron impurities in an active material for a lithium secondary battery by means of magnetic force. With this method, use of a magnetic force-generating device within a recess portion, which composes at least one part of the recess portion, enables efficient removal of only iron impurities. Thus, it is expected that a voltage drop caused by dissolution of iron compounds, i.e. impurities in a positive electrode, and their migration to a negative electrode in a battery, and decreases in charge and discharge efficiencies and a voltage drop owing to precipitation of lithium can be suppressed.
    Type: Application
    Filed: July 2, 2008
    Publication date: January 8, 2009
    Inventors: Toshikazu Yoshida, Tetsuyuki Murata, Shigeki Matsuta, Yasunobu Iwami, Yoshinori Kida, Hiroyuki Akita, Koji Hasumi
  • Publication number: 20070212609
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes, as generating elements, a positive electrode 11 which comprises, as a positive electrode, lithium nickel-cobalt-manganese oxide (LiNixCoyMnzO2) which can intercalate and deintercalate lithium ions or the mixture of lithium nickel-cobalt-manganese oxide (LiNixCoyMnzO2) and lithium manganese oxide whose amount is 0 to 50% by mass relative to the whole amount of the positive electrode active material, a negative electrode 12 which comprises a negative electrode active material which can intercalate and deintercalate lithium ions, and a nonaqueous electrolyte are provided. To the positive electrode 11, 5 to 20% by mass of lithium cobalt oxide relative to the whole amount of the positive electrode active material is added.
    Type: Application
    Filed: March 7, 2007
    Publication date: September 13, 2007
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventor: Yasunobu Iwami