Patents by Inventor Toshitada Sato

Toshitada Sato 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: 8734997
    Abstract: A negative electrode 100 for a nonaqueous electrolytic secondary cell includes a current collector 1 and a plurality of active material bodies 2 formed on a surface of the current collector 1 at intervals; each active material body 2 contains a material for occluding or releasing lithium; and a plurality of projections 3 are formed on a part of a side surface of each active material body 2.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: May 27, 2014
    Assignee: Panasonic Corporation
    Inventors: Satoshi Shibutani, Hideharu Takezawa, Kazuyoshi Honda, Toshitada Sato
  • Publication number: 20140020242
    Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode 4 including a positive electrode current collector and a positive electrode material mixture layer containing a positive electrode active material and a binder and provided on the positive electrode current collector; a negative electrode 5; a porous insulating layer 6 interposed between the positive electrode 4 and the negative electrode 5; and a nonaqueous electrolyte. The positive electrode current collector contains aluminium. The positive electrode current collector has an average crystal grain size of 1.0 ?m or more.
    Type: Application
    Filed: September 25, 2013
    Publication date: January 23, 2014
    Applicant: PANASONIC CORPORATION
    Inventors: Yoshiyuki MURAOKA, Toshitada SATO, Yasuhiko HINA, Akira NAGASAKI
  • Patent number: 8486549
    Abstract: A lithium ion secondary battery including: a positive electrode current collector; a positive electrode active material layer that is provided in contact with the positive electrode current collector; a separator layer that is provided on a side of the positive electrode active material layer on which the positive electrode current collector is not provided; a negative electrode active material layer that is provided on a side of the separator layer on which the positive electrode active material layer is not provided, that primarily contains silicon or tin, and that includes a opposing portion opposing the positive electrode active material layer and a non-opposing portion not opposing the positive electrode active material layer, the opposing portion and the non-opposing portion containing lithium produced by a thin film-forming method; and a negative electrode current collector that is provided on a side of the negative electrode active material layer on which the separator layer is not provided.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: July 16, 2013
    Assignee: Panasonic Corporation
    Inventors: Kazuyoshi Honda, Toshitada Sato, Daisuke Suetsugu, Katsumi Kashiwagi, Kunihiko Bessho
  • Patent number: 8361658
    Abstract: A negative electrode material for non-aqueous electrolyte secondary batteries, characterized in that the negative electrode material comprises a composite particle including solid phases A and B, the solid phase A being dispersed in the solid phase B, and the ratio (IA/IB) of the maximum diffracted X-ray intensity (IA) attributed to the solid phase A to the maximum diffracted X-ray intensity (IB) attributed to the solid phase B satisfies 0.001?IA/IB?0.1, in terms of a diffraction line obtained by a wide-angle X-ray diffraction measurement of the composite particle.
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: January 29, 2013
    Assignee: Panasonic Corporation
    Inventors: Harunari Shimamura, Toshitada Sato, Takayuki Nakamoto, Yasuhiko Bito, Yoshiaki Nitta
  • Patent number: 8334073
    Abstract: A method of manufacturing a negative electrode includes: a first step of forming a plurality of columnar active material blocks capable of electrochemically storing and releasing lithium ions on the surface of a current collector; and a second step of disposing particulate lithium in the gaps between the active material blocks.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: December 18, 2012
    Assignee: Panasonic Corporation
    Inventors: Toshitada Sato, Kazuyoshi Honda
  • Patent number: 8273136
    Abstract: A method for manufacturing an electrode of an electrochemical element includes: (A) forming an active material layer on a current collector; and (B) providing lithium to the active material layer. The A step and the B step are carried out in continuous space.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: September 25, 2012
    Assignee: Panasonic Corporation
    Inventors: Hideharu Takezawa, Toshitada Sato, Kazuyoshi Honda
  • Patent number: 8142931
    Abstract: A method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery includes the following three steps of: A) fabricating the negative electrode by depositing a negative electrode active material on a current collector; B) heat-treating the negative electrode; and C) imparting lithium to the negative electrode active material after the B step.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: March 27, 2012
    Assignee: Panasonic Corporation
    Inventors: Toshitada Sato, Daisuke Suetsugu, Katsumi Kashiwagi, Kazuyoshi Honda
  • Publication number: 20120032647
    Abstract: A method for determining completion of charge of a long-duration lithium ion secondary battery is provided. A method for determining completion of charge a lithium ion secondary battery including one lithium compound having an olivine crystal structure as a positive electrode active material, and a graphite material as a negative electrode active material, includes: (S1) charging the battery by an amount of electricity Xc in time Ti1; (S2) stopping the charging for time Yc after completion of (S1), and measuring a battery voltage Vi1 after the time Yc has passed; (S3) charging the amount of electricity Xc in the time Ti1 after completion of (S2); (S4) stopping the charging for the time Yc after completion of (S3), and measuring a battery voltage Vi2 after the time Yc has passed; and comparing Vi2?Vi1 with a predetermined voltage difference Vi3 to determine that the charge has been completed when Vi2?Vi1>Vi3, and determine that the charge has not been completed when Vi2?Vi1<Vi3.
    Type: Application
    Filed: October 29, 2010
    Publication date: February 9, 2012
    Inventors: Kozo Watanabe, Toshitada Sato, Masahiro Kinoshita
  • Patent number: 8067115
    Abstract: A non-aqueous electrolyte secondary battery comprising at least a negative electrode having a current collector provided thereon with convex portions and columnar bodies formed on the convex portions, each of the columnar bodies comprising n stages (where n?2) of overlaid columnar body portions alternately tilted to different orientations along a longitudinal direction of the current collector, a positive electrode having a positive electrode current collector provided on both surfaces thereof with a positive electrode mixture layer containing a positive electrode active material capable of inserting and extracting lithium ions reversibly, and a separator interposed between the positive electrode and the negative electrode in a confronting manner, wherein tip portions of the columnar body portions at the uppermost stage of the columnar bodies on the negative electrode are tilted toward a trailing end of winding direction.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: November 29, 2011
    Assignee: Panasonic Corporation
    Inventors: Takayuki Shirane, Kaoru Inoue, Masaya Ugaji, Masato Fujikawa, Toshitada Sato
  • Publication number: 20110287297
    Abstract: A separator (6) is disposed between a positive electrode (4) and a negative electrode (5), and includes a main body layer (6A) and a plurality of thin films (6B), (6C). Each of the plurality of thin films (6B), (6C) has a smaller thickness than the main body layer (6A), and a lower ionic permeability ratio than the main body layer (6A). Moreover, the plurality of thin films (6B), (6C) have ionic permeability ratios different from each other.
    Type: Application
    Filed: October 29, 2010
    Publication date: November 24, 2011
    Inventors: Toshitada Sato, Kozo Watanabe
  • Patent number: 8003253
    Abstract: A non-aqueous electrolyte secondary battery including: a positive electrode; a negative electrode, and a non-aqueous electrolyte. The negative electrode includes a negative electrode active material that includes at least Si. The non-aqueous electrolyte includes lithium hexafluorophosphate as a main supporting electrolyte and has an acid content of not less than 50 ppm and not more than 200 ppm. The negative electrode has a potential of not less than 0.6 V and not more than 1.5 V relative to a Li electrode at an end-of-discharge voltage of the battery. The battery is prevented from suffering degradation of storage characteristics caused by the dissolution reaction of Si from the negative electrode during charging and the precipitation reaction of the dissolved Si.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: August 23, 2011
    Assignee: Panasonic Corporation
    Inventors: Toshitada Sato, Yasuhiko Bito, Masaya Ugaji
  • Publication number: 20110200869
    Abstract: An electrode group 4 in which a positive electrode plate 1 and a negative electrode plate 2, each having on a surface of a current collector a mixture layer containing an active material, are wound or layered, with a porous insulating layer 3 interposed between the positive electrode plate 1 and the negative electrode plate 2, is sealed in a battery case 5 together with an nonaqueous electrolyte. Metallic particles 12 melted from a negative electrode current collector 10 are dispersed throughout a negative electrode mixture layer of the negative electrode plate 2. The metallic particles 12 are a metal which is melted from the negative electrode current collector 10 and which is deposited in the negative electrode mixture layer by reverse charging a lithium secondary battery and subsequently charging the lithium secondary battery.
    Type: Application
    Filed: August 19, 2010
    Publication date: August 18, 2011
    Inventors: Mami Matsumoto, Kozo Watanabe, Toshitada Sato
  • Publication number: 20110135997
    Abstract: The disclosed secondary battery is a flat secondary battery 10 including an electrode group 1 which is sealed in a laminate case 9 made of laminate films, and includes a positive electrode including a positive electrode current collector carrying thereon a positive electrode material mixture layer containing a positive electrode active material and a binder, a negative electrode, and a porous insulating layer. The laminate case 9 includes a container portion 9a for containing the electrode group 1, a weld portion 9b in which the laminate films are welded to each other, and a non-weld portion 9c which is provided between the container portion 9a and the weld portion 9b, and in which the laminate films are not welded to each other. The positive electrode has a tensile extension of 3.0% or higher.
    Type: Application
    Filed: July 16, 2009
    Publication date: June 9, 2011
    Inventors: Kozo Watanabe, Yoshiyuki Muraoka, Toshitada Sato, Mami Matsumoto
  • Publication number: 20110135981
    Abstract: A negative electrode of a nonaqueous electrolyte secondary battery includes a negative electrode current collector (21A) and a negative electrode active material layer (21B). The negative electrode current collector (21A) has a thickness of greater than or equal to 20 ?m and less than or equal to 50 ?m. The negative electrode active material layer (21B) is provided on at least one surface of the negative electrode current collector (21A). The negative electrode is formed by cutting a negative electrode original sheet to a predetermined width. The negative electrode has cutting roll over portions (21D) at cut ends thereof. The cutting roll over portions (21D) are formed by stretching the negative electrode current collector (21A) upwardly or downwardly in the thickness direction of the negative electrode, and are oriented toward an inner side of an electrode group (31).
    Type: Application
    Filed: August 5, 2010
    Publication date: June 9, 2011
    Inventors: Toshitada Sato, Yasutaka Kogetsu
  • Patent number: 7955735
    Abstract: A non-aqueous electrolyte secondary battery that has a high electrical capacity and exhibits excellent cycle characteristics even when the battery is rapidly charged and discharged at a large current includes: a positive electrode capable of reversibly absorbing and desorbing Li; a negative electrode; and a non-aqueous electrolyte. The negative electrode includes an alloying material that is capable of electrochemically absorbing and desorbing Li, and includes an A phase composed mainly of Si and a B phase including an intermetallic compound of at least one transition metal element and Si. The transition metal element is selected from the group consisting of Ti, Zr, Ni, Cu, and Fe. The A phase and/or the B phase includes a microcrystalline or amorphous region. The weight percent of the A phase relative to the total weight of the A phase and the B phase is greater than 40% and not greater than 95%.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: June 7, 2011
    Assignee: Panasonic Corporation
    Inventors: Yasuhiko Bito, Toshitada Sato, Teruaki Yamamoto
  • Publication number: 20110129736
    Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode 4 including a positive electrode current collector and a positive electrode material mixture layer containing a positive electrode active material and a binder and provided on the positive electrode current collector; a negative electrode 5; a porous insulating layer 6 interposed between the positive electrode 4 and the negative electrode 5; and a nonaqueous electrolyte. The positive electrode current collector contains aluminium. The positive electrode current collector has an average crystal grain size of 1.0 ?m or more.
    Type: Application
    Filed: July 15, 2009
    Publication date: June 2, 2011
    Inventors: Yoshiyuki Muraoka, Toshitada Sato, Yasuhiko Hina, Akira Nagasaki
  • Publication number: 20110111297
    Abstract: A nonaqueous electrolyte secondary battery including: an electrode group which includes a positive electrode containing lithium-containing composite oxide, a negative electrode capable of inserting and extracting lithium ions, and a porous insulator interposed between the positive electrode and the negative electrode, and is sealed in a battery case together with a nonaqueous electrolyte, wherein the porous insulator has a Gurley number of 100 sec/100 ml to 1000 sec/100 ml, both inclusive, and an average pore diameter of 0.05 ?m to 0.15 ?m, both inclusive.
    Type: Application
    Filed: September 22, 2010
    Publication date: May 12, 2011
    Inventors: Toshitada SATO, Kozo Watanabe
  • Publication number: 20110111302
    Abstract: Winding dislocation in forming an electrode group of a nonaqueous electrolyte secondary battery is prevented. An electrode plate for nonaqueous electrolyte secondary battery includes: a current collector; and an active material mixture layer including an active material and a binder on the current collector, wherein elongation at break is 3% or more, a dynamic hardness at a surface of the active material mixture layer is 4.5 or larger, and a dynamic hardness in an interior of the active material mixture layer is larger than that at the surface of the active material mixture layer by 0.8 or more.
    Type: Application
    Filed: December 17, 2009
    Publication date: May 12, 2011
    Inventors: Toshitada Sato, Yoshiyuki Muraoka
  • Publication number: 20110111276
    Abstract: An electrode plate for a nonaqueous electrolyte secondary battery includes: a current collector made of metal foil in the shape of a band; a mixture layer containing an active material and provided on each surface of the current collector; and an extension lead connected to the current collector. The current collector has an exposed portion having first and second surfaces on each of which the mixture layer is not provided. The exposed portion extends perpendicularly to a longitudinal direction of the current collector. The extension lead is connected to the first surface of the exposed portion. A portion of the first surface on which the mixture layer is not provided has a width larger than that of a portion of the second surface on which the mixture layer is not provided.
    Type: Application
    Filed: April 13, 2010
    Publication date: May 12, 2011
    Inventors: Toshitada Sato, Kozo Watanabe
  • Patent number: 7919205
    Abstract: A negative electrode for a lithium ion secondary battery of the present invention includes a current collector and an active material layer carried on the current collector. The active material layer contains silicon and oxygen. In the thickness direction of the active material layer, an oxygen ratio of the active material is greater at the side of the active material layer in contact with the current collector than at the side of the active material layer not in contact with the current collector. The active material layer contains no binder. By using the negative electrode described above, it is possible to provide a high capacity lithium ion secondary battery having superior high rate charge/discharge characteristics and excellent cycle characteristics.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: April 5, 2011
    Assignee: Panasonic Corporation
    Inventors: Yasutaka Kogetsu, Kazuyoshi Honda, Toshitada Sato, Hiroshi Yoshizawa