Patents by Inventor Megumi Uchida
Megumi Uchida 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: 10424777Abstract: To provide a cathode active material for a lithium ion secondary battery, which has high packing properties and high volume capacity density, and a method for its production.Type: GrantFiled: November 5, 2014Date of Patent: September 24, 2019Assignee: SUMITOMO CHEMICAL CO., LTD.Inventors: Satoshi Takamatsu, Yukimitsu Wakasugi, Megumi Uchida
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Publication number: 20150056511Abstract: To provide a cathode active material for a lithium ion secondary battery, which has high packing properties and high volume capacity density, and a method for its production.Type: ApplicationFiled: November 5, 2014Publication date: February 26, 2015Applicant: AGC SEIMI CHEMICAL CO., LTD.Inventors: Satoshi TAKAMATSU, Yukimitsu WAKASUGI, Megumi UCHIDA
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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: 8192711Abstract: To provide a process for producing a surface modified lithium-containing composite oxide, which is excellent in discharge capacity, volume capacity density, safety, durability for charge and discharge cycles and an excellent rate property, at a low production cost. The present invention is characterized in that a process for producing a surface modified lithium-containing composite oxide, wherein a lithium titanium composite oxide is contained in the surface layer of particles of a lithium-containing composite oxide represented by the 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?1.3, 0.9?x?2.0, 0?y?0.1, 1.9?z?4.2, and 0?a?0.Type: GrantFiled: October 27, 2009Date of Patent: June 5, 2012Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Megumi Uchida, Takeshi Kawasato, Remi Hiraki
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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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Publication number: 20110033749Abstract: To provide a process for producing a surface modified lithium-containing composite oxide, which is excellent in discharge capacity, volume capacity density, safety, durability for charge and discharge cycles and an excellent rate property, at a low production cost. The present invention is characterized in that a process for producing a surface modified lithium-containing composite oxide, wherein a lithium titanium composite oxide is contained in the surface layer of particles of a lithium-containing composite oxide represented by the 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?1.3, 0.9?x?2.0, 0?y?0.1, 1.9?z?4.2, and 0?a?0.Type: ApplicationFiled: October 27, 2009Publication date: February 10, 2011Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Megumi UCHIDA, Takeshi KAWASATO, Remi HIRAKI
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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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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: 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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POSITIVE ELECTRODE ACTIVE SUBSTANCE FOR LITHIUM SECONDARY BATTERY AND PROCESS FOR PRODUCING THE SAME
Publication number: 20090017383Abstract: 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: July 18, 2008Publication date: January 15, 2009Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu SUHARA, Naoshi SAITOH, Kazushige HORICHI, Megumi UCHIDA -
Publication number: 20080131780Abstract: 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: ApplicationFiled: December 7, 2007Publication date: June 5, 2008Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi KAWASATO, Tokumitsu Kato, Naoshi Satio, Koji Tatsumi, Megumi Uchida, Remi Hiraki
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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
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Publication number: 20070117014Abstract: It is to provide a cathode active material for a lithium ion secondary battery, which has high safety, a high discharge voltage, a large capacity and excellent cyclic durability, and a process for producing it. A cathode active material for a lithium secondary battery, characterized by comprising a particulate lithium cobalt composite oxide represented by the formula LiaCobAlcMgdAeOfFg??(1) (wherein A is Ti, Nb or Ta, O.90?a?1.10, 0.97?b?1.00, 0.000l?c?0.02, 0.000l?d?0.02, 0.000l?e?0.01, 1.98?f?2.02, 0?g?0.02, and 0.0003?c+d+e?0.03).Type: ApplicationFiled: January 19, 2007Publication date: May 24, 2007Applicant: Seimi Chemical Co., Ltd.Inventors: Naoshi SAITO, Kazushige Horichi, Megumi Uchida, Takeshi Kawasato, Manabu Suhara
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Patent number: 7192672Abstract: To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery, which has a large volume capacity density, high safety, high charge and discharge cycle durability, high press density and high productivity. A process for producing 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?0.02), characterized in that as a cobalt source, a mixture is used which comprises cobalt hydroxide in the form of substantially spherical secondary particles with an average particle size of from 8 to 20 ?m formed by agglomeration of primary particles and tricobalt tetroxide in the form of secondary particles with an average particle size of from 2 to 10 ?m formed by agglomeration of primary particles, in a cobalt atomic ratio of from 5:1 to 1:5, and firing is carried out at from 700 to 1,050° C.Type: GrantFiled: May 25, 2005Date of Patent: March 20, 2007Assignee: Seimi Chemical Co., Ltd.Inventors: Kazushige Horichi, Manabu Suhara, Naoshi Saito, Megumi Uchida