Patents by Inventor Ryuji Shiozaki

Ryuji Shiozaki 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: 20170275435
    Abstract: A resin composition includes a polyamide resin, and a graphene oxide.
    Type: Application
    Filed: February 27, 2017
    Publication date: September 28, 2017
    Inventor: Ryuji SHIOZAKI
  • Publication number: 20130071749
    Abstract: There is provided a positive electrode active material production method, a positive electrode, and a storage device. A production method of a positive electrode active material having a LiVPO4F-type crystal structure and containing carbon, includes: a step of synthesizing a precursor that has VPO4 containing carbon, from a starting material in the form of vanadium pentoxide and a phosphate compound, and from a carbon material as an additive; and a step of synthesizing LiVPO4F containing carbon, from the precursor and LiF. The carbon material as an additive is conductive carbon black having a specific surface area of 700 to 1500 m2/g, and in the step of synthesizing the precursor, an addition amount of the conductive carbon black is less than 2 moles per mole of vanadium pentoxide.
    Type: Application
    Filed: September 13, 2012
    Publication date: March 21, 2013
    Applicant: FUJI JUKOGYO KABUSHIKI KAISHA
    Inventors: Yuya MUKAINAKANO, Rikitaro Ishii, Ryuji Shiozaki
  • Patent number: 8241792
    Abstract: A crystal structure is provided to improve a characteristic of an electrode material, such as vanadium oxide. In the crystal structure, an amorphous state and a layered crystal state coexist at a predetermined ratio in a layered crystalline material such as vanadium oxide. In the layered crystalline material having such a layered crystal structure, layered crystal particles having a layer length L1 of 30 nm or shorter are formed. Ions are easily intercalated to and deintercalated from between the layers. When such a material is used for the positive electrode active material, a nonaqueous lithium secondary battery of which the discharge capacity and the cycle characteristic are good is manufactured.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: August 14, 2012
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Satoko Kaneko, Masahiko Taniguchi, Asao Iwata, Ryuji Shiozaki, Nobuo Ando
  • Patent number: 8153295
    Abstract: A positive active material is provided which can inhibit side reactions between the positive electrode and an electrolyte even at a high potential and which, when applied to a battery, can improve charge/discharge cycle performance without impairing battery performances even in storage in a charged state. Also provided are: a process for producing the active material; a positive electrode for lithium secondary batteries which employs the active material; and a lithium secondary battery which has improved charge/discharge cycle performance while retaining intact battery performances even after storage in a charged state and which can exhibit excellent charge/discharge cycle performance even when used at a high upper-limit voltage. The positive active material comprises: base particles able to dope and release lithium ions; and an element in Group 3 of the periodic table present on at least part of that part of the base particles which is able to come into contact with an electrolyte. It is produced by, e.g.
    Type: Grant
    Filed: July 13, 2004
    Date of Patent: April 10, 2012
    Assignee: GS Yuasa International Ltd.
    Inventors: Daisuke Endo, Akihiro Fujii, Ryuji Shiozaki, Tokuo Inamasu, Hiroe Nakagawa, Toshiyuki Nukuda
  • Publication number: 20110108760
    Abstract: An electrode material uses, as an active material, sodium vanadium oxide represented by NaxV2O5 (0<x<0.33) and having a crystal phase of a stoichiometric composition of Na0.33V2O5 or Na1.0V6O15. As a result, together with improving battery capacity by employing a composition in which Na is made to be deficient, satisfactory cycle characteristics can be maintained due to the presence of sodium. In addition, since an electrode material production method uses NaOH and NH4VO3 as raw materials, the electrode material of the present invention can be efficiently produced with heat treatment at a comparatively low temperature.
    Type: Application
    Filed: November 3, 2010
    Publication date: May 12, 2011
    Applicant: FUJI JUKOGYO KABUSHIKI KAISHA
    Inventors: Yuya Mukainakano, Daisuke Maruyama, Ken Baba, Ryuji Shiozaki
  • Publication number: 20110001084
    Abstract: The electrode material according to the present invention has a crystal phase in the form of a lattice containing lithium vanadium oxide, such as Li0.3V2O5 with a primary particle diameter of 10 nm or more and 200 nm or less, wherein lithium is arranged in the lattice. Accordingly, when the electrode material is used as the positive electrode material, especially in the crystallized state containing an amorphous glass composition such as phosphor, lithium, antimony (or iron), a high battery capacity can be obtained. Further, even if the charging and discharging are repeated, the crystal structure is difficult to be collapsed, whereby the cycle characteristic is enhanced.
    Type: Application
    Filed: July 1, 2010
    Publication date: January 6, 2011
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Daisuke Maruyama, Yuya Mukainakano, Ken Baba
  • Publication number: 20100330431
    Abstract: An electrode laminate unit 12 of an electric storage device 10 is composed of positive electrodes 14 and negative electrodes 15, which are alternately laminated, and a lithium electrode 16 is arranged at the outermost part of the electrode laminate unit 12 so as to oppose to the negative electrode 15. A charging/discharging unit 21 having first and second energization control units 21a and 21b is connected to a positive-electrode terminal 18, negative-electrode terminal 19, and a lithium-electrode terminal 20. Electrons are moved from the lithium electrode 16 to the positive electrode 14 through the first energization control unit 21a, and lithium ions are doped into the positive electrode 14 from the lithium electrode 16. Electrons are moved from the lithium electrode 16 to the negative electrode 15 through the second energization control unit 21b, and lithium ions are doped into the negative electrode 15 from the lithium electrode 16.
    Type: Application
    Filed: September 1, 2010
    Publication date: December 30, 2010
    Applicant: FUJI JUKOGYO KABUSHIKI KAISHA
    Inventors: Ryuji Shiozaki, Nobuo Ando, Satoko Kaneko, Masahiko Taniguchi
  • Patent number: 7846219
    Abstract: An electrode laminate unit of an electric storage device is composed of positive electrodes and negative electrodes, which are alternately laminated, and a lithium electrode arranged at the outermost part of the electrode laminate unit so as to oppose the negative electrode. A charging/discharging unit having first and second energization control units connected to a positive-electrode terminal, negative-electrode terminal, and a lithium-electrode terminal. Electrons are moved from the lithium electrode to the positive electrode through the first energization control unit, and lithium ions are doped into the positive electrode from the lithium electrode. Electrons are moved from the lithium electrode to the negative electrode through the second energization control unit, and lithium ions are doped into the negative electrode from the lithium electrode. The lithium ions are doped into both of the positive and negative electrodes, whereby the doping time can be dramatically shortened.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: December 7, 2010
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Nobuo Ando, Satoko Kaneko, Masahiko Taniguchi
  • Publication number: 20100173184
    Abstract: It has been found that when the potentials of the positive electrode and the negative electrode of the lithium ion secondary battery after the electrodes are short-circuited are each within a predetermined range, the battery produces high energy density. That is the present invention provides a lithium ion secondary battery having a positive electrode, a negative electrode and an electrolyte containing a lithium salt and an aprotic organic in which a positive electrode active material is a material allowing lithium ions and/or anions to be reversibly doped thereinto, and a negative electrode active material is a material allowing lithium ions to be reversibly doped thereinto, and the potentials of the positive electrode and the negative electrode after the positive electrode and the negative electrode are short-circuited are each selected to be within a range from 0.5 V to 2.0 V.
    Type: Application
    Filed: November 9, 2007
    Publication date: July 8, 2010
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Asao Iwata, Satoko Kaneko, Nobuo Ando, Masahiko Taniguchi
  • Patent number: 7691535
    Abstract: A positive active material is provided which can give a battery having a high energy density and excellent high-rate discharge performance and inhibited from decreasing in battery performance even in the case of high-temperature charge. Also provided is a non-aqueous electrolyte battery employing the positive active material. The positive active material contains a composite oxide which is constituted of at least lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula: LiaMnbNicCodOe (wherein 0<a?1.3, |b?c|?0.05, 0.6?d<1, 1.7?e?2.3, and b+c+d=1). The non-aqueous electrolyte battery has a positive electrode containing the positive active material, a negative electrode, and a non-aqueous electrolyte.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: April 6, 2010
    Assignee: GS Yuasa Corporation
    Inventors: Ryuji Shiozaki, Akihiro Fujii, Tokuo Inamasu, Hiroe Nakagawa, Suguru Kozono, Toshiyuki Nukuda
  • Publication number: 20090269274
    Abstract: An ammonium metavanadate is heat-treated to 500° C. or less at a predetermined rate of temperature rise, whereby a microcrystal particle of a vanadium pentoxide can be formed. According to the production method described above, a crystal of a nano-vanadium having a layer length of 100 nm or less can be formed. The nano-vanadium formed by the production method described above can effectively be used for an electrode of an electric storage device such as a battery. The production method according to the present invention can be linked to a conventional production method in which an ammonium metavanadate can be formed in the course of the method, whereby the present invention can smoothly be embodied.
    Type: Application
    Filed: April 17, 2009
    Publication date: October 29, 2009
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Daisuke Maruyama, Nobuo Ando
  • Publication number: 20090246634
    Abstract: A physical property of a suspension into which plural lithium materials, such as a lithium sulfide, lithium hydroxide, etc., and a vanadium material are dissolved is adjusted by using the plural lithium materials. According to the adjustment, the valence of pentavalent vanadium ions is controlled to be a desired ratio. A material having the obtained layered crystal particles and an amorphous part is used as a starting material, and this material is subject to a heat treatment. With this process, the layered crystal particles grow, while the amorphous part is decreased. Consequently, it is confirmed that the rate of capacity deterioration is improved.
    Type: Application
    Filed: March 19, 2009
    Publication date: October 1, 2009
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Daisuke Maruyama, Nobuo Ando
  • Publication number: 20090246633
    Abstract: When a layered crystal material of vanadium pentoxide that can be used as a positive electrode active material is manufactured, a sulfur-containing organic material is not used as a raw material in the present invention. Therefore, uncertain adhesion of the sulfur-containing organic material to the layered crystal material is eliminated. The property of the suspension containing a vanadium compound and plural lithium compounds such as lithium sulfide and lithium hydroxide is adjusted by using these lithium compounds. By this adjustment, the pentavalence of the vanadium ions is controlled to be a desired ratio. Consequently, an active material having reproducibility can be manufactured. First discharge energy of a lithium ion secondary battery using the active material can be enhanced.
    Type: Application
    Filed: March 25, 2009
    Publication date: October 1, 2009
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Satoko Kaneko, Nobuo Ando
  • Publication number: 20090104534
    Abstract: A crystal structure is provided to improve a characteristic of an electrode material, such as vanadium oxide. In the crystal structure, an amorphous state and a layered crystal state coexist at a predetermined ratio in a layered crystalline material such as vanadium oxide. In the layered crystalline material having such a layered crystal structure, layered crystal particles having a layer length L1 of 30 nm or shorter are formed. Ions are easily intercalated to and deintercalated from between the layers. When such a material is used for the positive electrode active material, a nonaqueous lithium secondary battery of which the discharge capacity and the cycle characteristic are good is manufactured.
    Type: Application
    Filed: November 9, 2007
    Publication date: April 23, 2009
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Satoko Kaneko, Masahiko Taniguchi, Asao Iwata, Ryuji Shiozaki, Nobuo Ando
  • Publication number: 20080299459
    Abstract: The ions other than a lithium ion and having a greater ion radius is interposed, before the lithium ion is doped, as an interlayer securing member in a vanadium oxide having a layered crystal into which the lithium ion can be doped. Since the interlayer securing member is interposed, the dope or dedope of the lithium ion into or from the vanadium oxide afterward can smoothly be performed. A sodium ion or the like can be employed as the interlayer securing member.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 4, 2008
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Nobuo Ando, Satoko Kaneko, Masahiko Taniguchi
  • Publication number: 20080299455
    Abstract: An electrode laminate unit 12 of an electric storage device 10 is composed of positive electrodes 14 and negative electrodes 15, which are alternately laminated, and a lithium electrode 16 is arranged at the outermost part of the electrode laminate unit 12 so as to oppose to the negative electrode 15. A charging/discharging unit 21 having first and second energization control units 21a and 21b is connected to a positive-electrode terminal 18, negative-electrode terminal 19, and a lithium-electrode terminal 20. Electrons are moved from the lithium electrode 16 to the positive electrode 14 through the first energization control unit 21a, and lithium ions are doped into the positive electrode 14 from the lithium electrode 16. Electrons are moved from the lithium electrode 16 to the negative electrode 15 through the second energization control unit 21b, and lithium ions are doped into the negative electrode 15 from the lithium electrode 16.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 4, 2008
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Ryuji Shiozaki, Nobuo Ando, Satoko Kaneko, Masahiko Taniguchi
  • Patent number: 7393476
    Abstract: A positive active material for lithium secondary batteries, includes a composite oxide including an oxide which is represented by the composite formula LixMnaNibCocO2 and has an ?-NaFeO2 structure, and an impurity phase including Li2MnO3. The values a, b, and c are within such a range that in a ternary phase diagram showing the relationship among these, (a, b, c) is present on the perimeter of or inside the quadrilateral ABCD defined by point A (0.5, 0.5, 0), point B (0.55, 0.45, 0), point C (0.55, 0.15, 0.30), and point D (0.15, 0.15, 0.7) as vertexes, and 0.95<x/(a+b+c)<1.35.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: July 1, 2008
    Assignee: GS Yuasa Corporation
    Inventors: Ryuji Shiozaki, Akihiro Fujii, Kazuya Okabe, Toshiyuki Nukuda
  • Publication number: 20060257743
    Abstract: An object of the present invention is to provide a nonaqueous electrolyte battery which restrains swelling of the battery during high-temperature storage and is excellent in battery performance after storage. The invention is characterized by a specific constitution of a nonaqueous electrolyte and a combination thereof with a positive active material having specific crystal structure and composition. Namely, it is characterized by a nonaqueous electrolyte battery containing a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the above nonaqueous electrolyte contains at least a cyclic carbonate having a carbon-carbon ? bond and the above positive electrode contains a positive active material comprising a composite oxide represented by a composite formula: LixMnaNibCOcO2 (wherein 0?x?1.1, a+b+c=1, |a-b|<0.05, 0<c<1) and having an ?-NaFeO2-type crystal structure.
    Type: Application
    Filed: March 17, 2004
    Publication date: November 16, 2006
    Applicant: YUASA CORPORATION
    Inventors: Junichi Kuratomi, Takaaki Iguchi, Akinori Ito, Ryuji Shiozaki, Kenji Kohno
  • Publication number: 20060177739
    Abstract: A positive active material is provided which can inhibit side reactions between the positive electrode and an electrolyte even at a high potential and which, when applied to a battery, can improve charge/discharge cycle performance without impairing battery performances even in storage in a charged state. Also provided are: a process for producing the active material; a positive electrode for lithium secondary batteries which employs the active material; and a lithium secondary battery which has improved charge/discharge cycle performance while retaining intact battery performances even after storage in a charged state and which can exhibit excellent charge/discharge cycle performance even when used at a high upper-limit voltage. The positive active material comprises: base particles able to dope and release lithium ions; and an element in Group 3 of the periodic table present on at least part of that part of the base particles which is able to come into contact with an electrolyte. It is produced by, e.g.
    Type: Application
    Filed: July 13, 2004
    Publication date: August 10, 2006
    Inventors: Daisuke Endo, Akihiro Fujii, Ryuji Shiozaki, Tokuo Inamasu, Hiroe Nakagawa, Toshiyuki Nukuda
  • Publication number: 20050019659
    Abstract: A positive active material is provided which can give a battery having a high energy density and excellent high-rate discharge performance and inhibited from decreasing in battery, performance even in the case of high-temperature charge. Also provided is a non-aqueous electrolyte battery employing the positive active material. The positive active material contains a composite oxide which is constituted of at least lithium (Li), manganese (Mn), nickel (Ni), cobalt (Co), and oxygen (O) and is represented by the following chemical composition formula: LiaMnbNicCodOe (wherein 0<a?1.3, |b?c|?0.05, 0.6?d<1, 1.7?e?2.3, and b+c+d=1). The non-aqueous electrolyte battery has a positive electrode containing the positive active material, a negative electrode, and a non-aqueous electrolyte.
    Type: Application
    Filed: March 26, 2003
    Publication date: January 27, 2005
    Inventors: Ryuji Shiozaki, Akihiro Fujii, Tokuo Inamasu, Hiroe Nakagawa, Suguru Kozono, Toshiyuki Nukuda