Patents by Inventor Masato Shirakata

Masato Shirakata 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: 8034475
    Abstract: A secondary battery includes an anode for a secondary battery, a cathode which absorbs and discharges lithium ions, and an electrolyte which is placed between the anode for the secondary battery and the cathode. The anode for the secondary battery includes an anode active material layer which absorbs and discharges lithium ions, the anode active material layer including a first layer including carbon as a chief ingredient, and a second layer including at least one first element having a theoretical capacity greater than a theoretical capacity of graphite, and at least one second element which has a theoretical capacity equal to or less than the theoretical capacity of graphite. The second layer includes particles, and the particles include the first element and the second element.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: October 11, 2011
    Assignee: NEC Corporation
    Inventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
  • Publication number: 20100248031
    Abstract: A secondary battery includes an anode for a secondary battery, a cathode which absorbs and discharges lithium ions, and an electrolyte which is placed between the anode for the secondary battery and the cathode. The anode for the secondary battery includes an anode active material layer which absorbs and discharges lithium ions, the anode active material layer including a first layer including carbon as a chief ingredient, and a second layer including at least one first element having a theoretical capacity greater than a theoretical capacity of graphite, and at least one second element which has a theoretical capacity equal to or less than the theoretical capacity of graphite. The second layer includes particles, and the particles include the first element and the second element.
    Type: Application
    Filed: June 7, 2010
    Publication date: September 30, 2010
    Applicant: NEC Corporation
    Inventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
  • Patent number: 7763387
    Abstract: Since a first layer (a carbon layer 2a) whose chief ingredient is carbon and a second layer (Li absorbing layer 3a) containing particles having a theoretical capacity greater than that of graphite are formed on anode collector 1a, high capacity and high operation voltage can be realized. Since a element having a theoretical capacity equal to or less than that of graphite is added to the particles constituting this second layer, expansion and contraction of volume according to the charge and discharge are suppressed. This enables capacity deterioration to be suppressed even though cycles go on.
    Type: Grant
    Filed: May 22, 2003
    Date of Patent: July 27, 2010
    Assignee: NEC Corporation
    Inventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
  • Patent number: 7202000
    Abstract: An anode for a secondary battery capable of inserting and extracting a lithium ion having a multi-layered structure including a first anode layer containing carbon as a main component; a second anode layer made of a film-like material through which a lithium component passes; and a third anode layer containing lithium and/or a lithium-containing compound as a main component. The battery capacity of the lithium ion battery is substantially increased while the higher charge-discharge efficiency and the stable cycle performance are maintained.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: April 10, 2007
    Assignee: NEC Corporation
    Inventors: Jiro Iriyama, Hironori Yamamoto, Tamaki Miura, Koji Utsugi, Masato Shirakata, Mitsuhiro Mori
  • Patent number: 6902844
    Abstract: A film-sealed nonaqueous electrolyte battery comprises: a battery element including a non-aqueous electrolyte; a film case having at least a sealant polymer resin film for sealing the battery element; at least a lead terminal extending from the battery element and projecting from the film case, and the lead terminal with a surface having a contact area in contact directly with the sealant polymer resin film, and at least the contact area of the surface of the lead terminal is coated with an anti-corrosion coating film, wherein the anti-corrosion coating film includes: (A) a polymer of structural units of a phenolic compound, and at least a part of the structural units includes a substituent which comprises an amino group or a substituted amino group; (B) a phosphate compound; and (C) a titanium fluorine compound.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: June 7, 2005
    Assignees: NEC Corporation, NEC Tokin Corporation, Nihon Parkerizing Co., Ltd.
    Inventors: Hiroshi Yageta, Hidemasa Kawai, Masato Shirakata, Tetsuya Takashima, Ikuo Kojima, Norihide Ohyama, Hiroyuki Iizuka
  • Publication number: 20050084758
    Abstract: Since a first layer (a carbon layer 2a) whose chief ingredient is carbon and a second layer (Li absorbing layer 3a) containing particles having a theoretical capacity greater than that of graphite are formed on anode collector 1a, high capacity and high operation voltage can be realized. Since a element having a theoretical capacity equal to or less than that of graphite is added to the particles constituting this second layer, expansion and contraction of volume according to the charge and discharge are suppressed. This enables capacity deterioration to be suppressed even though cycles go on.
    Type: Application
    Filed: May 22, 2003
    Publication date: April 21, 2005
    Inventors: Hironori Yamamoto, Yutaka Bannai, Mariko Miyachi, Jiro Iriyama, Hidemasa Kawai, Masato Shirakata
  • Patent number: 6818353
    Abstract: A lithium secondary battery in the present invention includes as a negative electrode a lithium alloy, lithium metal formed on a conductive substrate by vacuum film-forming, or the lithium metal having a hydrophobic material layer formed on a surface of an amorphous metallic lithium. Such a lithium secondary battery gives satisfaction with no dendrite formation and long cycle life.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: November 16, 2004
    Assignee: NEC Corporation
    Inventors: Mitsuhiro Mori, Masato Shirakata, Jiro Iriyama, Tamaki Miura, Hironori Yamamoto, Koji Utsugi
  • Publication number: 20040175621
    Abstract: An anode for a secondary battery capable of inserting and extracting a lithium ion having a multi-layered structure including a first anode layer (2a) containing carbon as a main component; a second anode layer (3a) made of a film-like material through which a lithium component passes; and a third anode layer (4a) containing lithium and/or a lithium-containing compound as a main component. The battery capacity of the lithium ion battery is substantially increased while the higher charge-discharge efficiency and the stable cycle performance are maintained.
    Type: Application
    Filed: January 30, 2004
    Publication date: September 9, 2004
    Inventors: Jiro Iriyama, Hironori Yamamoto, Tamaki Miura, Koji Utsugui, Masato Shirakata, Mitsuhiro Mori
  • Patent number: 6686092
    Abstract: A secondary battery including an electricity generating element, which includes at least a positive electrode implemented by a lithium-manganese compound oxide, a negative electrode, an electrolyte and a separator, and films encasing the electricity generating element is disclosed. The secondary battery further includes a composition causing the electrolyte to react with water to thereby produce hydrogen ions, and a hydrogen ion uptaking agent so positioned as to contact the electrolyte existing in the battery. The battery is desirable in charge-discharge cycle characteristic, storage characteristic, and safety. In addition, the battery swells little despite a repeated charge-discharge cycle or storage.
    Type: Grant
    Filed: December 12, 2000
    Date of Patent: February 3, 2004
    Assignee: NEC Corporation
    Inventors: Hiroshi Yageta, Tatsuji Numata, Chika Kanbe, Akira Kobayashi, Masato Shirakata, Masatomo Yonezawa
  • Patent number: 6682850
    Abstract: A positive electrode of a nonaqueous electrolyte solution secondary battery comprises (A) a lithium-manganese composite oxide and (B1) at least one lithium-nickel composite oxide which has a specific surface area X of 0.3≦X (m2/g) and which is selected from a group consisting of LiNiO2, Li2NiO2, LiNi2O4, Li2Ni2O4 and LiNi1−xMxO2 (0<x≦0.5 is satisfied, and M represents at least one metal element selected from a group consisting of Co, Mn, Al, Fe, Cu and Sr), whereby it is possible to obtain a nonaqueous electrolyte solution secondary battery which is superior in battery properties, especially charge and discharge cycle properties, retention properties and safety.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: January 27, 2004
    Assignee: NEC Corporation
    Inventors: Tatsuji Numata, Chika Kanbe, Akira Kobayashi, Masato Shirakata, Masatomo Yonezawa
  • Publication number: 20030180608
    Abstract: A lithium secondary battery in the present invention includes as a negative electrode a lithium alloy, lithium metal formed on a conductive substrate by vacuum film-forming, or the lithium metal having a hydrophobic material layer formed on a surface of an amorphous metallic lithium. Such a lithium secondary battery gives satisfaction with no dendrite formation and long cycle life.
    Type: Application
    Filed: December 27, 2002
    Publication date: September 25, 2003
    Inventors: Mitsuhiro Mori, Masato Shirakata, Jiro Iriyama, Tamaki Miura, Hironori Yamamoto, Koji Utsugi
  • Publication number: 20030091900
    Abstract: The present invention provides a lithium manganese oxide, wherein a content of sulfur is not more than 0.32% by weight, and an averaged diameter of pores is not less than 120 nanometers, and the lithium manganese oxide is represented by Li1+xMn2−x−yMyO4, where “M” is at least one of metals and 0.032≦x≦0.182; 0≦y≦0.2, and also provides a non-aqueous electrolyte secondary battery using the above lithium manganese compound oxide as a positive electrode active material.
    Type: Application
    Filed: November 30, 2000
    Publication date: May 15, 2003
    Inventors: Tatsuji Numata, Chika Kanbe, Yoshitada Tomioka, Masato Shirakata
  • Patent number: 6558438
    Abstract: In a film packed battery, a battery power source comprising, at least, a cathode, an anode, an electrolyte, and a separator is packed with a film. In a method for producing film packed battery, a pre-charging step for charging the film packed battery while pressure is applied, for example, by sandwiching it between two flat plates is included at least once.
    Type: Grant
    Filed: July 21, 2000
    Date of Patent: May 6, 2003
    Assignees: NEC Corporation, NEC Tokin Tochigi, Ltd.
    Inventors: Masaharu Satoh, Norihide Ohyama, Masato Shirakata, Tomokazu Kumeuchi, Hiroshi Yageta, Ryuichi Shimizu, Yutaka Bannai
  • Patent number: 6503656
    Abstract: A battery with a laminated film as a casing encapsulating the battery power source is manufactured by the steps of: heat sealing the sealing area of the laminated film, whereby encapsulating the battery power source in the laminated film; and irradiating, with an electron beam, a portion of the heat sealed area, thereby the irradiated area crosses, in the direction along the peripheries of the heat sealed area, the overlapping areas of the heat sealed area and the leading electrodes projecting toward outside from the positive electrode and the negative electrode. According to this method, produced is a battery having a high peeling strength at the position of terminals of leading electrodes without sacrificing battery properties and therefore having high reliability and safety.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: January 7, 2003
    Assignee: NEC Corporation
    Inventors: Yutaka Bannai, Hiroshi Yageta, Masaharu Satoh, Etsuo Hasegawa, Masato Shirakata
  • Publication number: 20020146621
    Abstract: A film-sealed nonaqueous electrolyte battery comprises: a battery element including a non-aqueous electrolyte; a film case having at least a sealant polymer resin film for sealing the battery element; at least a load terminal extending from the battery element and projecting from the film case, and the lead terminal with a surface having a contact area in contact directly with the sealant polymer resin film, and at least the contact area of the surface of the lead terminal is coated with an anti-corrosion coating film, wherein the anti-corrosion coating film includes: (A) a polymer of structural units of a phenolic compound, and at least a part of the structural units includes a substituent which comprises an amino group or a substituted amino group; (B) a phosphate compound; and (C) a titanium fluorine compound.
    Type: Application
    Filed: January 31, 2002
    Publication date: October 10, 2002
    Applicant: NEC CORPORATION
    Inventors: Hiroshi Yageta, Hidemasa Kawai, Masato Shirakata, Tetsuya Takashima, Ikuo Kojima, Norihide Ohyama, Hiroyuki Iizuka
  • Patent number: 6444359
    Abstract: In a secondary battery wherein a positive electrode active material layer 2 and a negative electrode active material layer 3 are allowed to face each other via a liquid electrolyte solution 1, there is used, as the electrolyte solution 1, a basic solvent containing a halogenated polyolefin and an aliphatic polyolefin dissolved therein.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: September 3, 2002
    Assignees: NEC Corporation, NEC Moli Energy Corporation
    Inventors: Masaharu Satoh, Hiroshi Yageta, Yutaka Bannai, Masato Shirakata, Norihide Ohyama, Tomokazu Kumeuchi
  • Publication number: 20020001754
    Abstract: In a secondary battery wherein a positive electrode active material layer 2 and a negative electrode active material layer 3 are allowed to face each other via an electrolyte solution 1, there is used, as the electrolyte solution 1, a basic solvent containing a halogenated polyolefin dissolved therein.
    Type: Application
    Filed: June 7, 2001
    Publication date: January 3, 2002
    Applicant: NEC Corporation
    Inventors: Masaharu Satoh, Hiroshi Yageta, Yutaka Bannai, Masato Shirakata, Norihide Ohyama, Tomokazu Kumeuchi
  • Patent number: 6309777
    Abstract: An active material free part of a positive electrode is coated with an over-coat material, wherein the over-coat material has at least one of the following properties: suppression of heat transfer from the second part of the electrode to the separator; reduction of a heat transfer rate from the second part of the electrode to the separator; prevention of transfer of excess heat from the second part of the electrode to the separator; electrical isolation of the second part of the electrode from the separator; prevention of charges generated in the first active material from becoming concentrated in the second part of the electrode and discharged from the second part; and prevention of the separator from being melted by a current discharge from or into the second part of the electrode through the separator until the current discharge is shut down by a fuse function of the separator.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: October 30, 2001
    Assignees: NEC Corporation, NEC Moli Energy Corporation
    Inventors: Tomoyuki Ohta, Masato Shirakata, Hajime Satoh
  • Publication number: 20010018149
    Abstract: A secondary battery including an electricity Generating element, which includes at least a positive electrode implemented by a lithium-manganese compound oxide, a negative electrode, an electrolyte and a separator, and films encasing the electricity generating element is disclosed. The secondary battery further includes a composition causing the electrolyte to react with water to thereby produce hydrogen ions, and a hydrogen ion uptaking agent so positioned as to contact the electrolyte existing in the battery. The battery is desirable in charge-discharge cycle characteristic, storage characteristic, and safety. In addition, the battery swells little despite a repeated charge-discharge cycle or storage.
    Type: Application
    Filed: December 12, 2000
    Publication date: August 30, 2001
    Inventors: Hiroshi Yageta, Tatsuji Numata, Chika Kanbe, Akira Kobayashi, Masato Shirakata, Masatomo Yonezawa
  • Patent number: 6156080
    Abstract: There is provided a method of fabricating an electrode used for a prismatic cell, including the steps of (a) winding an electrode sheet around a core, the electrode sheet comprising a positive electrode in the form of a sheet, a negative electrode in the form of a sheet, and an insulating sheet sandwiched between the positive and negative electrodes, (b) pulling out the core to thereby form a wound electrode sheet deposition, (c) heating the wound electrode sheet deposition at a temperature equal to or lower than a melting temperature of the insulating sheet for 30 minutes or smaller, and (d) compressing the wound electrode sheet deposition with a uniaxial pressure to thereby flatten the wound electrode sheet deposition. In accordance with the above-mentioned method, it is possible to increase a cell capacity per a unit volume in a prismatic cell, because the electrode sheet can be wound further half turn or a plurality of times.
    Type: Grant
    Filed: April 23, 1998
    Date of Patent: December 5, 2000
    Assignees: Nippon Mori Energy Corporation, NEC Corporation
    Inventors: Tomokazu Kumeuchi, Muneaki Nakanishi, Junji Tabuchi, Masato Shirakata