Patents by Inventor Hideaki Seki

Hideaki Seki 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: 20190277371
    Abstract: A resister clip (35) includes engage portions (35a) engaging with an engage groove, a spring portion (35b) and operating portions (35c). The spring portion (35b) can be designed with a high degree of freedom in terms of a coil number of turns, a winding diameter and others and the engage portions (35a) are widened centering on the spring portion (35b), so that diameter-widening resistance can be optimized.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 12, 2019
    Inventors: Naoto TSUJI, Hideaki SEKI
  • Patent number: 10243215
    Abstract: A positive electrode active material for lithium ion secondary battery includes: active material particles including one or more compounds including Li and a transition metal; and a coating layer coating at least a part of a surface of the active material particles. The coating layer includes at least one of graphene or multilayer graphene The coating layer has a Raman spectrum with a G band (a peak of 1530 cm?1 to 1630 cm?1), a D band (a peak of 1300 cm?1 to 1400 cm?1), and a 2D band (a peak of 2650 cm?1 to 2750 cm?1). At least the intensity of the 2D band normalized by the intensity of the G band (2Dint/Gint) satisfies 0.05?2Dint/Gint.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: March 26, 2019
    Assignee: TDK CORPORATION
    Inventors: Junpei Shitaba, Hideaki Seki, Hiroyuki Miyabara
  • Patent number: 10211456
    Abstract: A positive electrode active material for a lithium ion secondary battery contains: a first compound represented by chemical formula Lix(NiyMa1-y)O2 (0.95?x?1.05, 0.70?y?0.95, where Ma is at least one element selected from Co, Mn, V, Ti, Fe, Zr, Nb, Mo, Al, and W); and a second compound represented by chemical formula LiVOPO4. W>5.0° C., where W is a full width at half maximum of an exothermic peak obtained between 150° C. and 260° C. by differential scanning calorimetry (DSC) performed on a mixture of the first compound and the second compound under a condition of 5° C./min.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: February 19, 2019
    Assignee: TDK CORPORATION
    Inventors: Hideaki Seki, Akinobu Nojima
  • Publication number: 20190027779
    Abstract: A negative electrode for a lithium ion secondary battery includes a current collector and an active material-containing layer disposed on the current collector. The active material-containing layer includes: a first negative electrode active material including a carbon material; a second negative electrode active material including a metal element or a metalloid element as a constituent element, the metal element or the metalloid element being capable of forming an alloy with lithium; and a binder. The first negative electrode active material contains a spherical graphite, and the binder contains an acrylic resin.
    Type: Application
    Filed: July 11, 2018
    Publication date: January 24, 2019
    Applicant: TDK CORPORATION
    Inventors: Hiroshi Sasagawa, Yasuyuki Kawanaka, Hideaki Seki
  • Publication number: 20180287199
    Abstract: A positive electrode active material for a lithium ion secondary battery is lithium vanadium phosphate represented by a following composition expression (1) and in which a peak intensity ((002)int/(201)int) of a (002) plane normalized with respect to a peak intensity of a (201) plane and a peak intensity ((102)int/(201)int) of a (102) plane normalized with respect to a peak intensity of the (201) plane in an X-ray diffraction pattern satisfy 0.35?(002)int/(201)int?0.53 and 0.46?(102)int/(201)int?0.63, respectively, LixVOPO4??(1).
    Type: Application
    Filed: March 15, 2018
    Publication date: October 4, 2018
    Applicant: TDK CORPORATION
    Inventors: Junpei SHITABA, Hideaki SEKI, Masahiro TSUCHIYA
  • Publication number: 20180287200
    Abstract: In this non-aqueous electrolyte secondary battery, a positive terminal and a negative terminal extend in a first direction, protrude from a laminated cell stack, and are provided so that a center line is interposed therebetwen, the center line passing through a midpoint of both ends of the laminated cell stack in a second direction orthogonal to the first direction and extending in the first direction when the laminated cell stack is seen in plan view, and a first terminal with higher heat dissipation efficiency among the positive terminal and the negative terminal is provided in a location closer to the center line than a location of a second terminal with lower heat dissipation efficiency among the positive terminal and the negative terminal.
    Type: Application
    Filed: March 20, 2018
    Publication date: October 4, 2018
    Applicant: TDK CORPORATION
    Inventors: Takashi SASAKI, Hideaki SEKI, Hirofumi KAKUTA, Akinobu NOJIMA, Shin FUJITA
  • Patent number: 9825295
    Abstract: A positive electrode active material contains a compound represented by a chemical formula LiVOPO4. A crystal system of the compound is an orthorhombic system, and the amount of tetravalent V of the compound is 27.7 mass % or more and 28.2 mass % or less.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: November 21, 2017
    Assignee: TDK CORPORATION
    Inventors: Hideaki Seki, Atsushi Sano, Masaki Sobu, Tomoshi Nakamoto
  • Publication number: 20170288214
    Abstract: A positive electrode active material for a lithium ion secondary battery contains: a first compound represented by chemical formula Lix(NiyMa1-y)O2 (0.95?x?1.05, 0.70?y?0.95, where Ma is at least one element selected from Co, Mn, V, Ti, Fe, Zr, Nb, Mo, Al, and W); and a second compound represented by chemical formula LiVOPO4. W>5.0° C., where W is a full width at half maximum of an exothermic peak obtained between 150° C. and 260° C. by differential scanning calorimetry (DSC) performed on a mixture of the first compound and the second compound under a condition of 5° C./min.
    Type: Application
    Filed: February 21, 2017
    Publication date: October 5, 2017
    Applicant: TDK CORPORATION
    Inventors: Hideaki SEKI, Akinobu NOJIMA
  • Publication number: 20170250401
    Abstract: A positive electrode includes: a positive electrode current collector; and a positive electrode active material layer disposed on the positive electrode current collector. The positive electrode active material layer contains a lithium-containing transition metal oxide represented by composition formula (1) indicated below, and a compound represented by LiVOPO4. The lithium-containing transition metal oxide and the compound represented by LiVOPO4 are dispersed in the positive electrode active material layer. LitNixCoyAlzO2 ??(1) where 0.9<t<1.1, 0.3<x<0.99, 0.01<y<0.4, 0.001<z<0.2, and x+y+z=1.
    Type: Application
    Filed: February 21, 2017
    Publication date: August 31, 2017
    Applicant: TDK CORPORATION
    Inventors: Tetsu SYOJI, Hideaki SEKI, Hirofumi KAKUTA, Shin FUJITA
  • Publication number: 20170250402
    Abstract: A positive electrode active material for a lithium ion secondary battery includes: a first active material selected from active materials represented by composition formula (1); and a second active material represented by composition formula (2). A ratio a/b of an average particle diameter a of the first active material to an average particle diameter b of the second active material is in a range of 1?a/b?60. LiwNix(M1)y(M2)zO2 ??(1) where M1 is at least one element selected from Co and Mn, M2 is at least one element selected from Al, Fe, Cr, Ba, Mn, and Mg, 0.9<w<1.1, 2.0<(x+y+z+w)?2.1, 0.3<x<0.95, 0.01<y<0.4, and 0.001<z<0.2. LiaVOPO4 ??(2) where 0<??1.2.
    Type: Application
    Filed: February 21, 2017
    Publication date: August 31, 2017
    Applicant: TDK CORPORATION
    Inventors: Tetsu SYOJI, Hideaki SEKI
  • Publication number: 20170149051
    Abstract: A positive electrode active material includes: a lithium complex oxide expressed by chemical formula (1); a highly thermal conductive compound; and graphene or multilayer graphene. LixM1yM21-yO2??(1) In the formula (1), M1 is at least one metal selected from Ni, Co, and Mn, M2 is at least one metal selected from the group consisting of Al, Fe, Ti, Cr, Mg, Cu, Ga, Zn, Sn, B, V, Ca, and Sr, and x and y are numbers such that 0.05?x?1.2 and 0.3?y?1.
    Type: Application
    Filed: November 10, 2016
    Publication date: May 25, 2017
    Applicant: TDK CORPORATION
    Inventors: Shin FUJITA, Hideaki SEKI
  • Publication number: 20160285103
    Abstract: A positive electrode active material for lithium ion secondary battery, includes: a lithium nickel complex oxide represented by composition formula (1); a phosphate compound; and a coating layer formed on at least a part of a surface of a particle of the lithium nickel complex oxide, and including a high thermal conductive material with heat conductivity of 500 W/m·K or more. The coating layer of the particle of the lithium nickel complex oxide includes a portion connected to the coating layer of another particle of the lithium nickel complex oxide: LixNi1-yMyO2??(1) where M includes at least one metal selected from the group consisting of Co, Fe, Ti, Cr, Mg, Al, Cu, Ga, Mn, Zn, Sn, B, V, Ca, and Sr, and x and y are such that 0.05?x?1.2 and 0?y?0.5.
    Type: Application
    Filed: March 22, 2016
    Publication date: September 29, 2016
    Applicant: TDK CORPORATION
    Inventors: Junpei SHITABA, Hideaki SEKI, Akinobu NOJIMA, Shin FUJITA, Masahiro SAEGUSA
  • Publication number: 20160285073
    Abstract: A positive electrode active material includes: a lithium complex oxide expressed by chemical formula (1); and a highly thermal conductive compound having thermal conductivity of 10 W/m·K or more, the chemical formula (1) being LixM1yM21-yO2??(1) where M1 is at least one metal selected from the group consisting of Ni, Co, and Mn, M2 is at least one metal selected from the group consisting of Al, Fe, Ti, Cr, Mg, Cu, Ga, Zn, Sn, B, V, Ca, and Sr, and x and y are numbers such that 0.05?x?1.2 and 0.3?y?1.
    Type: Application
    Filed: March 22, 2016
    Publication date: September 29, 2016
    Applicant: TDK CORPORATION
    Inventors: Shin FUJITA, Hideaki SEKI
  • Publication number: 20160285102
    Abstract: A positive electrode active material for lithium ion secondary battery includes: active material particles including one or more compounds including Li and a transition metal; and a coating layer coating at least a part of a surface of the active material particles. The coating layer includes at least one of graphene or multilayer graphene The coating layer has a Raman spectrum with a G band (a peak of 1530 cm?1 to 1630 cm?1), a D band (a peak of 1300 cm?1 to 1400 cm?1), and a 2D band (a peak of 2650 cm?1 to 2750 cm?1). At least the intensity of the 2D band normalized by the intensity of the G band (2Dint/Gint) satisfies 0.05?2Dint/Gint.
    Type: Application
    Filed: March 21, 2016
    Publication date: September 29, 2016
    Applicant: TDK CORPORATION
    Inventors: Junpei SHITABA, Hideaki SEKI, Hiroyuki MIYABARA
  • Patent number: 9437865
    Abstract: To provide an active material having high capacity and excellent cycle characteristics. An active material has a layered crystal structure and is expressed by a compositional formula (1) LiyNiaCobMncMdOx (1), where the element M is at least one kind of element selected from the group consisting of Al, Si, Zr, Ti, Fe, Mg, Nb, Ba, and V; 1.9?(a+b+c+d+y)?2.1; 1.05?y?1.35; 0<a?0.3; 0<b?0.25; 0.3?c?0.7; 0?d?0.1; and 1.9?x?2.1, and wherein 0.69?Ni?/Ni??0.85, where Ni? is the Ni composition amount at a center portion of the active material primary particle, and Ni? is the Ni composition amount in the vicinity of a surface (in a width of 30 nm from the surface).
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: September 6, 2016
    Assignee: TDK CORPORATION
    Inventors: Hideaki Seki, Tomohiko Kato, Hirofumi Nakano, Atsushi Sano
  • Publication number: 20150064558
    Abstract: To provide an active material having high capacity and excellent cycle characteristics. An active material has a layered crystal structure and is expressed by a compositional formula (1) LiyNiaCobMncMdOx (1), where the element M is at least one kind of element selected from the group consisting of Al, Si, Zr, Ti, Fe, Mg, Nb, Ba, and V; 1.9?(a+b+c+d+y)?2.1; 1.05?y?1.35; 0<a?0.3; 0<b?0.25; 0.3?c?0.7; 0?d?0.1; and 1.9?x?2.1, and wherein 0.69?Ni?/Ni??0.85, where Ni? is the Ni composition amount at a center portion of the active material primary particle, and Ni? is the Ni composition amount in the vicinity of a surface (in a width of 30 nm from the surface).
    Type: Application
    Filed: March 26, 2013
    Publication date: March 5, 2015
    Inventors: Hideaki Seki, Tomohiko Kato, Hirofumi Nakano, Atsushi Sano
  • Publication number: 20140170496
    Abstract: A positive electrode active material contains a compound represented by a chemical formula LiVOPO4. A crystal system of the compound is an orthorhombic system, and the amount of tetravalent V of the compound is 27.7 mass % or more and 28.2 mass % or less.
    Type: Application
    Filed: December 17, 2013
    Publication date: June 19, 2014
    Inventors: Hideaki SEKI, Atsushi SANO, Masaki SOBU, Tomoshi NAKAMOTO
  • Patent number: 8592334
    Abstract: A dielectric ceramic composition comprises, a main component including barium titanate, a first subcomponent including MgO, a second subcomponent including sintering aids of SiO2 compound, a third subcomponent including at least one of V2O5, Nb2O5 and WO3, a fourth A subcomponent including RA oxide (note that, RA is at least one selected from Tb, Gd and Dy), a fourth B subcomponent including RB oxide (note that, RB is at least one selected from Ho, Y and Yb), and a fifth subcomponent including MnO or Cr2O3.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: November 26, 2013
    Assignee: TDK Corporation
    Inventors: Kosuke Takano, Mari Miyauchi, Nobuto Morigasaki, Hideaki Seki, Makoto Maeda, Takahiro Yamada
  • Publication number: 20130260248
    Abstract: An active material has a layered structure and a composition represented by the following formula (1) LiyNiaCobMncMdOx . . . (1), wherein M is at least one selected from Al, Si, Zr, Ti, Fe, Mg, Nb, Ba and V, and a, b, c, d, x and y satisfy 1.9?(a+b+c+d+y)?2.1, 1.0<y?1.3, 0<a?0.3, 0<b?0.25, 0.3?c?0.7, 0?d?0.1, and 1.9?x?2.1. The active material has a ratio of the half width FWHM003 of a diffraction peak at a (003)-plane to the half width FWHM104 of a diffraction peak at a (104)-plane represented by the formula (2) FWHM003/FWHM104?0.57 . . . (2), and an average primary particle diameter of 0.2 to 0.5 ?m.
    Type: Application
    Filed: March 18, 2013
    Publication date: October 3, 2013
    Applicant: TDK CORPORATION
    Inventors: Hideaki SEKI, Tomohiko KATO, Hirofumi NAKANO, Atsushi SANO
  • Patent number: 8257212
    Abstract: A chain tensioner has a plunger (14) slidably fitted in a bottomed cylinder (12) formed in a housing (11), and configured to resiliently urge the plunger (14) by a return spring (13) in the direction along which the plunger (14) is projected out from the cylinder (12), wherein the chain tensioner is configured to attach an engagement clip (19) to the opening of the cylinder (12), and to provide an engagement portion engageable with the engagement clip (19) to the end of the plunger (14) on the projection side thereof, so as to allow the engagement clip (19) and the engagement portion to engage with and disengage from each other corresponding to the position of rotation of the plunger (14).
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: September 4, 2012
    Assignee: Daido Kogyo Co., Ltd.
    Inventors: Toshimitsu Yoshimura, Hitoshi Hamano, Yoshio Kurokawa, Hideaki Seki