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).
-
Patent number: 7270797Abstract: To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery excellent in volume capacity density, safety, charge and discharge cyclic durability, press density and productivity, by using in expensive cobalt hydroxide and lithium carbonate. A mixture having a cobalt hydroxide powder and a lithium carbonate powder mixed so that the atomic ratio of lithium/cobalt would be from 0.98 to 1.01, is fired in an oxygen-containing atmosphere at from 250 to 700° C., and the fired product is further fired in an oxygen-containing atmosphere at from 850 to 1,050° C., or such a mixture is heated at a temperature-raising rate of at most 4° C./min in a range from 250 to 600° C. and fired in an oxygen-containing atmosphere at from 850 to 1,050° C.Type: GrantFiled: May 13, 2005Date of Patent: September 18, 2007Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Koji Tatsumi
-
Patent number: 7238769Abstract: The present invention provides a method for joining liquid-crystalline polyester resin composition parts, characterized in that the melting point of the liquid crystalline polyester resin measured by differential scanning calorimeter is 190-250° C. and that the parts are jointed by means of welding. By using the method of the present invention, jointed articles with sufficient joint strength are provided with accuracy.Type: GrantFiled: May 10, 2005Date of Patent: July 3, 2007Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo KenkyujoInventors: Masaya Kitayama, Naoshi Saito
-
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
-
Publication number: 20070099087Abstract: 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: ApplicationFiled: December 14, 2006Publication date: May 3, 2007Applicant: Seimi Chemical Co., Ltd.Inventors: Takuya MIHARA, Yukimitsu Wakasugi, Naoshi Saito, Manabu Suhara
-
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
-
Publication number: 20070026314Abstract: It is to provide a positive electrode active material for a lithium secondary battery, which has a large volume capacity density, high safety, excellent properties for uniform coating, excellent durability for charge and discharge cycles and low temperature characteristics even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by 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 a solution comprising a complex containing the M element (M element-containing complex) dissolved in an organic solvent, an N source and a lithium source, and if necessary, a fluorine source, by means of a mixing step, an organic solvent removal step and a firing step.Type: ApplicationFiled: September 29, 2006Publication date: February 1, 2007Applicant: Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Megumi Uchida, Toshiaki Abe, Naoshi Saito, Manabu Suhara
-
Publication number: 20060263690Abstract: 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: September 25, 2003Publication date: November 23, 2006Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Megumi Uchida
-
Publication number: 20060222951Abstract: 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: ApplicationFiled: August 16, 2004Publication date: October 5, 2006Inventors: Koji Tatsumi, Toshiaki Abe, Naoshi Saito, Manabu Suhara
-
Publication number: 20060210879Abstract: A lithium-containing composite oxide for a positive electrode for a lithium secondary battery is prepared by formulating a powder mixture by impregnating an N element source powder having an average particle size (D50) ranging from 2 to 20 ?m with an aqueous solution of a carboxylic acid having a total of two or more carboxylic acid groups or carboxylic acid groups and hydroxyl groups in its molecule, and optionally, containing an M element, or its salt, and then drying the material obtained; and firing the N element powder material in admixture with a lithium source, optionally, an M element source and a fluorine source, at a temperature ranging from 700° C. to 1050° C.Type: ApplicationFiled: March 2, 2006Publication date: September 21, 2006Applicant: Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Megumi Uchida, Naoshi Saito, Manabu Suhara
-
Publication number: 20060154146Abstract: It is to provide a positive electrode active material for a lithium secondary battery, which has a large volume capacity density and high safety, is excellent in uniform coating properties and is excellent in the charge and discharge cyclic durability and low temperature characteristics even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by 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 the Q element and the N element, 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.Type: ApplicationFiled: March 10, 2006Publication date: July 13, 2006Applicant: Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Naoshi Saito, Megumi Uchida, Kazushige Horichi, Koji Tatsumi, Kunihiko Terase, Manabu Suhara
-
Patent number: 7018741Abstract: A particulate positive electrode active material for a lithium secondary cell which satisfies high charge and discharge cyclic durability, high safety, high temperature storage properties, a high discharge average voltage, large current discharge properties, a high weight capacity density, a high volume capacity density, etc. in a well-balanced manner is provided. A particulate positive electrode active material for a lithium secondary cell, which is represented by the formula LipCoxMyOzFa (wherein M is at least one element selected from Groups 2 to 8, 13 and 14 of the Periodic Table, 0.9?p?1.1, 0.980?x?0.9999, 0.0001?y?0.02, 1.9?z?2.1, 0.9?x+y?1 and 0.0001?a?0.02), wherein fluorine atoms and element M are unevenly distributed on the particle surface, the atomic ratio of fluorine atoms to cobalt atoms (a/x) is from 0.0001 to 0.02, and in powder X-ray diffraction using CuK?-ray, the half value width of the angle of diffraction on (110) plane is from 0.06 to 0.Type: GrantFiled: August 12, 2004Date of Patent: March 28, 2006Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Tsutomu Kato, Megumi Yukawa
-
Publication number: 20050256289Abstract: The present invention provides a method for joining liquid-crystalline polyester resin composition parts, characterized in that the melting point of the liquid crystalline polyester resin measured by differential scanning calorimeter is 190-250° C. and that the parts are jointed by means of welding. By using the method of the present invention, jointed articles with sufficient joint strength are provided with accuracy.Type: ApplicationFiled: May 10, 2005Publication date: November 17, 2005Inventors: Masaya Kitayama, Naoshi Saito
-
Publication number: 20050250013Abstract: 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: ApplicationFiled: June 6, 2003Publication date: November 10, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Koji Tatsumi, Manabu Suhara, Naoshi Saito, Kazushige Horichi, Yukio Jitsugiri
-
Publication number: 20050220701Abstract: To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery excellent in volume capacity density, safety, charge and discharge cyclic durability, press density and productivity, by using in expensive cobalt hydroxide and lithium carbonate. A mixture having a cobalt hydroxide powder and a lithium carbonate powder mixed so that the atomic ratio of lithium/cobalt would be from 0.98 to 1.01, is fired in an oxygen-containing atmosphere at from 250 to 700° C., and the fired product is further fired in an oxygen-containing atmosphere at from 850 to 1,050° C., or such a mixture is heated at a temperature-raising rate of at most 4° C./min in a range from 250 to 600° C. and fired in an oxygen-containing atmosphere at from 850 to 1,050° C.Type: ApplicationFiled: May 13, 2005Publication date: October 6, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Koji Tatsumi
-
Publication number: 20050214645Abstract: 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, O.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: ApplicationFiled: May 25, 2005Publication date: September 29, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Kazushige Horichi, Manabu Suhara, Naoshi Saito, Megumi Uchida
-
Patent number: 6929883Abstract: The present invention provides a lithium-transition metal composite oxide having a large volume capacity density, high safety, excellent coating uniformity, excellent charge/discharge cycle durability and excellent low temperature characteristics, and suitable as a positive electrode active material for a lithium secondary cell. A lithium-transition metal composite oxide which is represented by the formula LixM1?yNyO2 (wherein 0.2?x?1.2, 0?y?0.7, M is a transition metal element, and N is a transition metal element other than M or an alkaline earth metal element), wherein in the distribution curve of the cumulative volume particle size of said lithium composite oxide, the inclination of the curve at a cumulative volume fraction of 20% and 80% are at most 9%/?m and at least 3%/?m, respectively, and the average particle size is from 3 to 20 ?m.Type: GrantFiled: May 30, 2001Date of Patent: August 16, 2005Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Megumi Yukawa, Naoshi Saito, Takashi Kimura, Kazuo Sunahara
-
Publication number: 20050019662Abstract: A particulate positive electrode active material for a lithium secondary cell which satisfies high charge and discharge cyclic durability, high safety, high temperature storage properties, a high discharge average voltage, large current discharge properties, a high weight capacity density, a high volume capacity density, etc. in a well-balanced manner is provided. A particulate positive electrode active material for a lithium secondary cell, which is represented by the formula LipCoxMyOzFa (wherein M is at least one element selected from Groups 2 to 8, 13 and 14 of the Periodic Table, 0.9?p?1.1, 0.980?x?0.9999, 0.0001?y?0.02, 1.9?z?2.1, 0.9?x+y?1 and 0.0001?a?0.02), wherein fluorine atoms and element M are unevenly distributed on the particle surface, the atomic ratio of fluorine atoms to cobalt atoms (a/x) is from 0.0001 to 0.02, and in powder X-ray diffraction using CuK?-ray, the half value width of the angle of diffraction on (110) plane is from 0.06 to 0.Type: ApplicationFiled: August 12, 2004Publication date: January 27, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Tsutomu Kato, Megumi Yukawa
-
Publication number: 20040213729Abstract: 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.Type: ApplicationFiled: May 21, 2004Publication date: October 28, 2004Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Megumi Uchida
-
Publication number: 20040023113Abstract: The present invention provides a lithium-transition metal composite oxide having a large volume capacity density, high safety, excellent coating uniformity, excellent charge/discharge cycle durability and excellent low temperature characteristics, and suitable as a positive electrode active material for a lithium secondary cell.Type: ApplicationFiled: November 29, 2002Publication date: February 5, 2004Inventors: Manabu Suhara, Megumi Yukawa, Naoshi Saito, Takashi Kimura, Kazuo Sunahara
-
Patent number: 6664341Abstract: A liquid crystal polyester resin composition which suppresses the formation of a blister caused by a heat treatment at a high temperature and has excellent moldability. This composition comprises (A) a liquid crystal polyester comprising at least two aromatic oxycarbonyl recurring units and (B) a liquid crystal polyester comprising at least two aromatic oxycarbonyl recurring units, at least one aromatic dioxy recurring unit and at least one aromatic dicarbonyl recurring unit. The weight ratio of the liquid crystal polyester (A) to the liquid crystal polyester (B) is 90/10 to 30/70.Type: GrantFiled: December 14, 2001Date of Patent: December 16, 2003Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo KenkyushoInventors: Masaya Kitayama, Kiichi Kometani, Naoshi Saito