Patents by Inventor Naoshi Saito
Naoshi Saito 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).
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Patent number: 8287828Abstract: A process for producing a lithium-containing composite oxide for a positive electrode active material for use in a lithium secondary battery, the oxide having the formula LipQqNxMyOzFa (wherein Q is at least one element selected from the group consisting of titanium, zirconium, niobium and tantalum, N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than Q and N, 0.9?p?1.1, 0?q<0.03, 0.97?x?1.00, 0?y<0.03, 1.9?z?2.1, q+x+y=1 and 0?a?0.02), which comprises firing a mixture of a lithium, Q element source and N element sources, and an M element source and/or fluorine source when these elements are present, in an oxygen-containing atmosphere, wherein the Q element source is a Q element compound aqueous solution having a pH of from 0.5 to 11.Type: GrantFiled: March 10, 2006Date of Patent: October 16, 2012Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Naoshi Saito, Megumi Uchida, Kazushige Horichi, Koji Tatsumi, Kunihiko Terase, Manabu Suhara
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Patent number: 8192715Abstract: The present invention provides a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, which has a large volume capacity density and high safety, and excellent durability for charge and discharge cycles and charge and discharge rate property, and its production method. The lithium-containing composite oxide is represented by the general formula LipNxMyOzFa (where N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9?p?1.2, 0.965?x<2.00, 0<y?0.035, 1.9?z?4.2, and 0?a?0.Type: GrantFiled: February 10, 2009Date of Patent: June 5, 2012Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Kazushige Horichi, Megumi Uchida, Takuya Mihara, Naoshi Saito
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Patent number: 8163198Abstract: A process for producing a lithium-containing composite oxide having a large volume capacity density, high safety, excellent durability for charge/discharge cycles, and excellent low temperature characteristics. An oxide of general formula LipNxMyOzFa (wherein N is at least one of Co, Mn or Ni, M is at least one of Al, an alkali earth metal element, a transition metal element other than N, 0.9?p?1.2, 0.97?x?1.00, 0?y?0.03, 1.9?z?2.2, x+y=1 and 0?a?0.02) can be produced.Type: GrantFiled: November 15, 2007Date of Patent: April 24, 2012Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Naoshi Saito, Takeshi Kawasato, Tokumitsu Kato, Kazushige Horichi
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Patent number: 8101300Abstract: A cathode active material for a non-aqueous electrolyte secondary battery comprises a lithium-containing composite oxide powder, which is represented by the formula LipNxMyOzFa wherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is zirconium and optionally at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than the element N, 0.9?p?1.1, 0.965?x?1.00, 0?y?0.035, 1.9?z?2.1, x+y=1 and 0?a?0.02, an atomic ratio of zirconium/the element N is in a range of at least 1.0 to 4.0. A method to produce the cathode active material is provided.Type: GrantFiled: March 13, 2008Date of Patent: January 24, 2012Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Yukio Jitsugiri, Yukiko Amagasaki, Takeshi Kawasato, Naoshi Saito, Tokumitsu Kato, Yukimitsu Wakasugi
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Patent number: 8101143Abstract: A process for producing a lithium-containing composite oxide for a positive electrode active material for use in a lithium secondary battery, the oxide having the formula LipNxMmOzFa (wherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than N, 0.9?p?1.2, 0.9?x<1.00, 0<m?0.03, 1.9?z?2.2, x+m=1 and 0?a?0.02), which comprises using as an M element source a solution comprising a complex containing the M element dissolved in an organic solvent.Type: GrantFiled: September 29, 2006Date of Patent: January 24, 2012Assignee: Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Megumi Uchida, Toshiaki Abe, Naoshi Saito, Manabu Suhara
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Patent number: 7981547Abstract: A positive electrode active material for a lithium secondary battery containing a lithium-cobalt composite oxide is produced by firing, as a cobalt source, a mixture of substantially spherical cobalt hydroxide or tricobalt tetraoxide having such a sharp particle size distribution that the average particle size D50 is from 7 to 20 ?m, and cobalt oxyhydroxide having an average particle size of secondary particles formed by agglomeration of primary particles of from 7 to 20 ?m, in a proportion of from 5:1 to 1:5 as the cobalt atomic ratio, at a temperature of from 700° C. to 1050° C. in an oxygen-comprising atmosphere.Type: GrantFiled: August 3, 2010Date of Patent: July 19, 2011Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Megumi Uchida
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Patent number: 7842268Abstract: To provide a cathode active material for a lithium secondary battery, which is low in gas generation and has high safety and excellent durability for charge and discharge cycles even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by the formula LipLqNxMyOzFa (wherein L is at least one element selected from the group of B and P, N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than N, 0.9?p?1.1, 1.0?q<0.03, 0.97?x<1.00, 0?y?0.03, 1.9?z?2.1, q+x+y=1 and 0?a?0.Type: GrantFiled: August 14, 2007Date of Patent: November 30, 2010Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Tokumitsu Kato, Megumi Uchida, Naoshi Saito, Manabu Suhara
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POSITIVE ELECTRODE ACTIVE SUBSTANCE FOR LITHIUM SECONDARY BATTERY AND PROCESS FOR PRODUCING THE SAME
Publication number: 20100294985Abstract: A positive electrode active material for a lithium secondary battery containing a lithium-cobalt composite oxide, which has a large volume capacity density, has a high safety and is excellent in charge and discharge cyclic durability, and its production process, are provided. A lithium-cobalt composite oxide represented by the formula LipCoxMyOzFa (wherein M is a transition metal element other than Co or an alkaline earth metal element, 0.9?p?1.1, 0.980?x?1.000, 0?y?0.02, 1.9?z?2.1, x+y=1 and 0?a?0.Type: ApplicationFiled: August 3, 2010Publication date: November 25, 2010Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Megumi Uchida -
Positive electrode active substance for lithium secondary battery and process for producing the same
Patent number: 7824803Abstract: A positive electrode active material is produced by firing, as a cobalt source, a mixture of a) substantially spherical large particle size cobalt hydroxide or tricobalt tetraoxide having a sharp particle size distribution, and b) small particle size cobalt hydroxide or tricobalt tetraoxide, in a proportion of from 9:1 to 1:2 as the cobalt atomic ratio, at a temperature of from 700° C. to 1050° C. in an oxygen-comprising atmosphere.Type: GrantFiled: July 18, 2008Date of Patent: November 2, 2010Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Megumi Uchida -
Patent number: 7709148Abstract: To provide a process for producing a lithium-containing composite oxide for a positive electrode of a lithium secondary battery, which has a large volume capacity density, high safety, excellent durability for charge and discharge cycles and excellent low temperature characteristics.Type: GrantFiled: December 7, 2007Date of Patent: May 4, 2010Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Tokumitsu Kato, Naoshi Saito, Koji Tatsumi, Megumi Uchida, Remi Hiraki
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Patent number: 7615315Abstract: A positive electrode material for a lithium secondary battery for high voltage high capacity use exhibiting high cycle durability and high safety. The positive electrode material is composed of particles having a composition represented by the general formula: LiaCobMgcAdOeFf (A is the group 6 transition element or the group 14 element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c?0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02 and 0.0001?c+d?0.03), and magnesium, the element A and fluorine exist uniformly in the vicinity of the surfaces of the particles.Type: GrantFiled: August 16, 2004Date of Patent: November 10, 2009Assignee: Seimi Chemical Co., Ltd.Inventors: Koji Tatsumi, Toshiaki Abe, Naoshi Saito, Manabu Suhara
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Publication number: 20090148772Abstract: The present invention provides a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, which has a large volume capacity density and high safety, and excellent durability for charge and discharge cycles and charge and discharge rate property, and its production method. The lithium-containing composite oxide is represented by the general formula LipNxMyOzFa (where N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9?p?1.2, 0.965?x<2.00, 0<y?0.035, 1.9?z?4.2, and 0?a?0.Type: ApplicationFiled: February 10, 2009Publication date: June 11, 2009Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi KAWASATO, Kazushige Horichi, Megumi Uchida, Takuya Mihara, Naoshi Saito
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Patent number: 7504180Abstract: There is obtained a material of a positive electrode for a secondary lithium-ion cell having high cycle durability and high safety in high-voltage and high-capacity applications, which is a particulate positive electrode active material for a secondary lithium-ion cell represented by a general formula, LiaCObAcBdOeFf (A is Al or Mg, B is a group-IV transition element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c?0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02, and 0.0001?c+d?0.03), where element A, element B and fluorine are evenly present in the vicinity of the particle surfaces.Type: GrantFiled: June 6, 2003Date of Patent: March 17, 2009Assignee: Seimi Chemical Co., Ltd.Inventors: Koji Tatsumi, Manabu Suhara, Naoshi Saito, Kazushige Horichi, Yukio Jitsugiri
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Patent number: 7501209Abstract: The present invention provides a positive electrode, which has a large volume capacity density, high safety, and is excellent in the coating uniformity, the charge and discharge cyclic durability and the low-temperature properties. Further, the present invention provides a process for producing a lithium-cobalt composite oxide for a positive electrode for a lithium secondary cell, the lithium-cobalt composite oxide being represented by the formula LipCoxMyOzFa (wherein M is a transition metal element other than Co, aluminum or an alkaline earth metal element, 0.9?p?1.1, 0.980?x?1.000, 0?y?0.02, 1.9?z?2.1, x+y=1 and 0?a?0.02).Type: GrantFiled: May 21, 2004Date of Patent: March 10, 2009Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Megumi Uchida
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Patent number: 7481991Abstract: A process to produce a positive electrode active material for a lithium secondary battery, having a large volume capacity density and high safety, uniform coating properties, charge and discharge cyclic durability and low temperature characteristics even at a high charge voltage is disclosed. The positive electrode active material is a lithium-containing composite oxide represented by the formula LipNxMyOzFa, wherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Sn, Zn, Al, alkaline earth metal elements, and transition metal elements other than the N element, O.9?p?l.1, 0.97?x?l.00, 0?y?0.03, 1.9?z?2.1, x+y=1 and 0?a?0.02. The N element source powder having an average particle size of from 2 to 20 ?m, is impregnated with the M element salt aqueous solution, and the prepared dry powder comprising the N element, M element, a lithium source and optionally a fluorine source is fired at from 700 to 1 ,050° C.Type: GrantFiled: March 2, 2006Date of Patent: January 27, 2009Assignee: Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Megumi Uchida, Naoshi Saito, Manabu Suhara
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Patent number: 7429434Abstract: It is to provide a cathode active material powder for a positive electrode for a lithium secondary battery, which has a large volume capacity density, high safety and excellent durability for charge and discharge cycles. A cathode active material powder for a lithium secondary battery characterized by comprising a first composite oxide powder represented by the formula (1) LipQxMyOzFa (wherein Q is Co or Mn, M is aluminum or an alkaline earth metal element or a transition metal element other than Q, provided that when Q is Co, 0.9?p?1.1, 0.980?x?1.000, 0?y?0.02, 1.9?z?2.1, x+y=1, and 0?a?0.02, and when Q is Mn, 1?p?1.3, x=2?y, 0?y?0.05, z=4, and a=0), having an average particle size D50 of from 5 to 30 ?m, and having a compression breaking strength of at least 40 MPa; and a second composite oxide powder represented by the formula (2) LipNixCoyMnzNqOrFa (wherein N is aluminum or an alkaline earth metal element or a transition metal element other than Ni, Co and Mn, 0.9?p?1.1, 0.2?x?0.8, 0?y?0.4, 0?z?0.Type: GrantFiled: December 14, 2006Date of Patent: September 30, 2008Assignee: Seimi Chemical Co., Ltd.Inventors: Takuya Mihara, Yukimitsu Wakasugi, Naoshi Saito, Manabu Suhara
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Publication number: 20080160414Abstract: Provided are a cathode active material for a non-aqueous electrolyte secondary battery with high operating voltage, high volume capacity density, high safety and excellent charge and discharge cyclic properties, and its production method. The cathode active material for a non-aqueous electrolyte secondary battery, which comprises a lithium-containing composite oxide powder, which is represented by the formula LipNxMyOzFa (wherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than the element N, 0.9?p?1.1, 0.965?x<1.00, 0<y?0.035, 1.9?z?2.1, x+y=1 and 0?a?0.02), a surface layer of which contains zirconium, and the surface layer within 5 nm of which has an atomic ratio (zirconium/the element N) of at least 1.0.Type: ApplicationFiled: March 13, 2008Publication date: July 3, 2008Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Yukio Jitsugiri, Yukiko Amagasaki, Takeshi Kawasato, Naoshi Saito, Tokumitsu Kato, Yukimitsu Wakasugi
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Publication number: 20080135802Abstract: A process for producing a lithium-containing composite oxide having a large volume capacity density, high safety, excellent durability for charge/discharge cycles, and further, excellent low temperature characteristics, which is suitable for mass production, is provided. A process for producing a lithium-containing composite oxide represented by a general formula LipNxMyOzFa (wherein N is at least one type of element selected from the group consisting of Co, Mn and Ni, M is at least one type of element selected from the group consisting of Al, an alkali earth metal element and a transition metal element other than N, 0.9?p?1.2, 0.97?x?1.00, 0<y?0.03, 1.9?z?2.2, x+y=1 and 0?a?0.Type: ApplicationFiled: November 15, 2007Publication date: June 12, 2008Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Naoshi Saito, Takeshi Kawasato, Tokumitsu Kato, Kazushige Horichi
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Publication number: 20080076027Abstract: A process for producing a lithium-containing composite oxide such as a lithium-cobalt composite oxide for a lithium secondary battery, excellent in durability for charge/discharge cycles and excellent in low temperature characteristics, is provided. A process for producing a lithium-containing composite oxide for positive electrode of lithium secondary battery, which is a process for producing a lithium-containing composite oxide represented by a general formula LipNxMyOzFa (wherein N is at least one type of element selected from the group consisting of Co, Mn and Ni, and M is at least one type of element selected from the group consisting of Al, an alkali earth metal element and a transition metal element other than N, 0.9?p?1.2, 0.97?x?1.00, 0<y?0.03, 1.9?z?2.2, x+y=1 and 0?a?0.Type: ApplicationFiled: November 19, 2007Publication date: March 27, 2008Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Naoshi Saito, Masaaki Ikemura, Tokumitsu Kato, Keiichi Kuwahara
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Publication number: 20070298324Abstract: To provide a cathode active material for a lithium secondary battery, which is low in gas generation and has high safety and excellent durability for charge and discharge cycles even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by the formula LipLqNxMyOzFa (wherein L is at least one element selected from the group of B and P, N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than N, 0.9?p?1.1, 1.0?q<0.03, 0.97?x<1.00, 0?y?0.03, 1.9?z?2.1, q+x+y=1 and 0?a?0.Type: ApplicationFiled: August 14, 2007Publication date: December 27, 2007Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Tokumitsu Kato, Megumi Uchida, Naoshi Saito, Manabu Suhara