Patents by Inventor Manabu Suhara
Manabu Suhara 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: 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: 20070111097Abstract: A composite oxide suitable for an active material of a positive electrode for a lithium secondary cell which can be used in a wide range of voltage, has a large electric capacity and excellent low temperature performance and is excellent in the durability for charge-discharge cycles and highly safe, a process for its production, and a positive electrode and a cell employing it, are presented. The composite oxide is a lithium-cobalt composite oxide which is represented by the formula LiCo1-xMxO2, (wherein 0?x?0.02 and M is at least one member selected from the group consisting of Ta, Ti, Nb, Zr and Hf), and which has a half-width of the diffraction peak for (110) face at 2?=66.5±1°, of from 0.070 to 0.180°, as measured by the X-ray diffraction using CuK? as a ray source.Type: ApplicationFiled: January 10, 2007Publication date: May 17, 2007Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu SUHARA, Kazuo Sunahara, Naoshi Saitoh, Tsutomu Katoh
-
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
-
Publication number: 20060083989Abstract: Coagulated particles of nickel-cobalt-manganese hydroxide wherein primary particles are coagulated to form secondary particles are synthesized by allowing an aqueous solution of a nickel-cobalt-manganese salt, an aqueous solution of an alkali-metal hydroxide, and an ammonium-ion donor to react under specific conditions; and a lithium-nickel-cobalt-manganese-containing composite oxide represented by a general formula, LipNixMn1-x-yCoyO2-qFq (where 0.98?p?1.07, 0.3?x?0.5, 0.1?y?0.38, and 0?q?0.05), which is a positive electrode active material for a lithium secondary cell having a wide usable voltage range, a charge-discharge cycle durability, a high capacity and high safety, is obtained by dry-blending coagulated particles of nickel-cobalt-manganese composite oxyhydroxide formed by making an oxidant to act on the coagulated particles with a lithium salt, and firing the mixture in an oxygen-containing atmosphere.Type: ApplicationFiled: March 22, 2004Publication date: April 20, 2006Applicant: SEIMI CHEMICAL CO., LTD.Inventors: Manabu Suhara, Takuya Mihara, Koichiro Ueda, Yukimitsu Wakasugi
-
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: 20060057466Abstract: There is obtained an active material for a lithium secondary battery that has a wide usable voltage range, a high charge-discharge cycle durability, a high capacity and high safety and availability. The particles of a lithium-nickel-cobalt-manganese-fluorine-containing composite oxide having an R-3m rhombohedral structure represented by a general formula LipNixMn1-x-yCoyO2-qFq (where 0.98?p?1.07, 0.3?x?0.5, 0.1?y?0.38, and 0?q?0.05), and the particles of the lithium-nickel-cobalt-manganese-fluorine-containing composite oxide characterized in that the half-width of the diffraction peak of a (110) plane whose 2? is 65±0.5° in the X-ray diffraction using a Cu—K? line is, 0.12 to 0.25° are used as an active substance for a positive electrode.Type: ApplicationFiled: July 7, 2004Publication date: March 16, 2006Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Takuya Mihara, Sumitoshi Yajima, Koichiro Ueda, Yukimitsu Wakasugi
-
Publication number: 20050271944Abstract: To provide a lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability. A positive electrode active material powder for a lithium secondary battery characterized by comprising a first granular powder having a compression breaking strength of at least 50 MPa and a second granular powder having a compression breaking strength of less than 40 MPa, formed by agglomeration of many fine particles of a lithium composite oxide represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is a transition metal element other than Ni, Co and Mn, Al or an alkaline earth metal element, 0.9?p?1.1, 0.2?x?0.8, 0?x?0.4, 0?z?0.5, y+z>0, 0?q?0.05, 1.9?2?a?2.1, x+y+z+q=1, and 0?a?0.02) to have an average particle size D50 of from 3 to 15 ?m, in a weight ratio of the first granular powder/the second granular powder being from 50/50 to 90/10.Type: ApplicationFiled: June 13, 2005Publication date: December 8, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Takuya Mihara, Koichiro Ueda, Yukimitsu Wakasugi
-
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: 20050220700Abstract: A lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability, is presented. It is a lithium-nickel-cobalt-manganese composite oxide powder for a lithium secondary battery, represented by the formula LipNixCoyMnzMqO2-aFa (wherein M is a transition metal element other than Ni, Co or Mn, or an alkaline earth metal element, 0.9?p?1.1, 0.2?x?0.5, 0.1?y?0.4, 0.2?z?0.5, 0?q?0.05, 1.9?2-a?2.1, x+y+z+q=1, and 0?a?0.02). The lithium-nickel-cobalt-manganese composite oxide is an agglomerated granular composite oxide powder having an average particle size D50 of from 3 to 15 ?m, formed by agglomeration of many fine particles, and the compression breaking strength of the powder is at least 50 MPa.Type: ApplicationFiled: May 20, 2005Publication date: October 6, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Takuya Mihara, Koichiro Ueda, Yukimitsu Wakasugi
-
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
-
Patent number: 6898067Abstract: An electric double layer capacitor which has a low internal resistance and a large capacitance per unit volume and which is excellent in the voltage retention property, is provided. In a non-aqueous type electric double layer capacitor having a separator disposed between a positive electrode and a negative electrode made of carbonaceous electrodes, the separator comprises a sheet having a thickness of from 10 to 100 ?m and a porosity of from 50 to 90% and a netted spacer having a thickness of from 10 to 100 mm, a numerical aperture of from 30 to 85% and an opening of from 50 to 350 mesh, laminated one on the other.Type: GrantFiled: September 13, 1999Date of Patent: May 24, 2005Assignee: Asahi Glass Company Ltd.Inventors: Kazuya Hiratsuka, Manabu Suhara, Takeshi Kawasato, Naruaki Tomita, Naoki Yoshida, Yoshiaki Higuchi
-
Publication number: 20050031518Abstract: The present invention provides a composite oxide for a high performance solid oxide fuel cell which can be fired at a relatively low temperature, and which has little heterogeneous phases of impurities other than the desired composition. The composite oxide is the one having a perovskite type crystal structure containing rare earth elements, and having constituent elements homogeneously dispersed therein. A homogeneous composite oxide having an abundance ratio of heterogeneous phases of at most 0.3% by average area ratio, and a melting point of at least 1470° C., is obtained by using metal carbonates, oxides or hydroxides, and reacting them with citric acid in an aqueous system.Type: ApplicationFiled: November 15, 2002Publication date: February 10, 2005Inventors: Fumio Munakata, Kenji Furuya, Masaharu Hatano, Yoshinori Fujie, Manabu Suhara