Patents by Inventor Takaaki Ikemachi
Takaaki Ikemachi 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: 7452636Abstract: A lithium secondary battery including a positive electrode, a negative electrode including a carbon material as an active material, and a nonaqueous electrolyte comprising a solute dissolved in a nonaqueous solvent in which ?-butyrolactone is the main solvent, wherein the carbon material has a ratio (ID/IG) of a Raman spectrum intensity (a peak intensity ratio) (R) obtained by Raman spectroscopy of 0.2 or greater, and the nonaqueous electrolyte includes at least 0.1 part by weight of vinylene carbonate and at least 0.1 part by weight of vinyl ethylene carbonate in 100 parts by weight of the nonaqueous electrolyte.Type: GrantFiled: March 4, 2004Date of Patent: November 18, 2008Assignee: SANYO Electric Co., Ltd.Inventors: Atsushi Yanai, Katsunori Yanagida, Yoshinori Kida, Takaaki Ikemachi, Toshiyuki Nohma
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Patent number: 7416813Abstract: A lithium secondary battery is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte prepared by dissolving a solute in a non-aqueous solvent wherein a positive electrode active material of said positive electrode is composed of lithium-manganese composite oxide having a spinel structure and lithium-transition metal composite oxide having a layer structure containing at least nickel and lithium salt having oxalato complex as anion is admixed to said non-aqueous electrolyte.Type: GrantFiled: February 25, 2005Date of Patent: August 26, 2008Assignee: Sanyo Electric Co., Ltd.Inventors: Toyoki Fujihara, Kazuhisa Takeda, Hideki Kitao, Takaaki Ikemachi, Toshiyuki Nouma, Naoya Nakanishi
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Publication number: 20060204841Abstract: A battery includes an electrically-conductive battery can (1) for accommodating a spirally-wound electrode assembly (3) in which an electrolyte solution is impregnated. The battery can has an open end and a closed end, and to the open end, an electrically-conductive sealing plate (5) is fixed being insulated from the battery can (1). A positive electrode (31) and a negative electrode (33) project from respective opposing ends of the spirally-wound electrode assembly (3), and a positive electrode current collector plate (4) and a negative electrode current collector plate (2) are joined to the respective projecting edges of the electrodes (31), (33). Electrically-conductive leads (45), (46) connect the positive electrode current collector plate (4) and the sealing plate (5) together. The negative electrode current collector plate (2) and the battery can (1) are electrically connected to each other.Type: ApplicationFiled: March 6, 2006Publication date: September 14, 2006Applicant: SANYO ELECTRIC CO., LTD.Inventors: Kouichi Satoh, Kazunari Ohkita, Tomohiko Yokoyama, Takaaki Ikemachi
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Publication number: 20050266316Abstract: A non-aqueous electrolyte secondary battery that uses a layered lithium-transition metal composite oxide as a positive electrode active material can alleviate reduction in battery capacity associated with charge-discharge cycling at high temperatures and can enhance elevated-temperature durability, that is, high-temperature cycle performance. A non-aqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material capable of intercalating and deintercalating lithium, a negative electrode containing a negative electrode active material capable of intercalating and deintercalating lithium, and a non-aqueous electrolyte having lithium ion conductivity. The non-aqueous electrolyte secondary battery uses a layered lithium-transition metal composite oxide superficially coated with microparticles of Al2O3 as the positive electrode active material.Type: ApplicationFiled: May 27, 2005Publication date: December 1, 2005Inventors: Hideki Kitao, Toyoki Fujihara, Kazuhisa Takeda, Takaaki Ikemachi, Toshiyuki Nohma
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Publication number: 20050266312Abstract: Elevated-temperature durability (i.e., high-temperature storage performance) is improved in a non-aqueous electrolyte secondary battery that uses a layered lithium-transition metal composite oxide as a positive electrode active material. A non-aqueous electrolyte secondary battery includes: a positive electrode containing a layered lithium-transition metal composite oxide as a positive electrode active material, a negative electrode containing a negative electrode active material capable of intercalating and deintercalating lithium, and a non-aqueous electrolyte having lithium ion conductivity. The lithium-transition metal composite oxide contains boron and at least one element selected from the group IVa elements of the periodic table.Type: ApplicationFiled: May 24, 2005Publication date: December 1, 2005Inventors: Toyoki Fujihara, Hideki Kitao, Kazuhisa Takeda, Takaaki Ikemachi, Toshiyuki Nohma
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Publication number: 20050191553Abstract: A lithium secondary battery is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte prepared by dissolving a solute in a non-aqueous solvent wherein a positive electrode active material of said positive electrode is composed of lithium-manganese composite oxide having a spinel structure and lithium-transition metal composite oxide having a layer structure containing at least nickel and lithium salt having oxalato complex as anion is admixed to said non-aqueous electrolyte.Type: ApplicationFiled: February 25, 2005Publication date: September 1, 2005Applicant: SANYO Electric Co., Ltd.Inventors: Toyoki Fujihara, Kazuhisa Takeda, Hideki Kitao, Takaaki Ikemachi, Toshiyuki Nohma, Naoya Nakanishi
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Publication number: 20050069758Abstract: Good cycle performance and high discharge power characteristics are obtained with a non-aqueous secondary cell including a positive electrode containing as a positive electrode active material a mixture of a lithium-manganese composite oxide and a lithium-transition metal composite oxide containing at least Ni and Mn, and a negative electrode having as a negative electrode active material a material capable of intercalating and deintercalating lithium. Discharge of the non-aqueous secondary cell is controlled so that the end-of-discharge voltage of the non-aqueous secondary cell becomes equal to or higher than 2 V and lower than 3 V.Type: ApplicationFiled: September 29, 2004Publication date: March 31, 2005Inventors: Hideki Kitao, Toyoki Fujihara, Kouichi Satoh, Takaaki Ikemachi, Toshiyuki Nohma
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Publication number: 20040224235Abstract: A lithium secondary battery including a positive electrode, a negative electrode including a carbon material as an active material, and a nonaqueous electrolyte comprising a solute dissolved in a nonaqueous solvent in which &ggr;-butyrolactone is the main solvent, wherein the carbon material has a ratio (ID/IG) of a Raman spectrum intensity (a peak intensity ratio) (R) obtained by Raman spectroscopy of 0.2 or greater, and the nonaqueous electrolyte includes at least 0.1 part by weight of vinylene carbonate and at least 0.1 part by weight of vinyl ethylene carbonate in 100 parts by weight of the nonaqueous electrolyte.Type: ApplicationFiled: March 4, 2004Publication date: November 11, 2004Inventors: Atsushi Yanai, Katsunori Yanagida, Yoshinori Kida, Takaaki Ikemachi, Toshiyuki Nohma
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Publication number: 20040224230Abstract: A lithium cell includes a positive electrode, a negative electrode employing a carbon material as an active material, and a non-aqueous electrolyte including a solute dissolved in a non-aqueous solvent, and is characterized in that the carbon material in the negative electrode has an RA value (IA/IG) of 0.05 or more, the RA value calculated from a peak intensity (IA) of a broad peak PA having a full width at half maximum of 100 cm−1 or more and a peak intensity (IG) in the vicinity of 1580 cm−1 as determined by laser Raman spectroscopy using an argon ion laser having a wavelength of 514.5 nm, the peak intensity (IA) determined from a peak PD in the vicinity of 1360 cm−1, as determined by the aforesaid laser Raman spectroscopy, which is separated into the broad peak PA having the full width at half maximum of 100 cm−1 or more and a peak PB having a full width at half maximum of less than 100 cm−1.Type: ApplicationFiled: March 9, 2004Publication date: November 11, 2004Inventors: Katsunori Yanagida, Atsushi Yanai, Yoshinori Kida, Takaaki Ikemachi, Toshiyuki Nohma, Takeshi Ogasawara
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Publication number: 20040191636Abstract: A nonaqueous electrolyte secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a carbon material as a negative electrode active material, and a nonaqueous electrolyte containing a solvent and a solute wherein sulfolane is included in the nonaqueous electrolyte as a solvent and vinyl ethylene carbonate and vinylene carbonate or a derivative of the vinylene carbonate are added to the nonaqueous electrolyte.Type: ApplicationFiled: March 26, 2004Publication date: September 30, 2004Inventors: Yoshinori Kida, Katsunori Yanagida, Atsushi Yanai, Takaaki Ikemachi, Toshiyuki Nohma
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Patent number: 6743551Abstract: The separator 10a for use in the alkaline storage battery of the invention comprises densely and uniformly formed over the entire separator and entrained from the surface to the back plane of the separator, first fine paths (pores) 15 rendered hydrophilic and second fine paths (pores) 16 rendered non-hydrophilic. In this manner, the gas generated in the vicinity of the first fine paths (pores) 15 can immediately reach the second fine paths (pores) 16 formed in the vicinity of the first fine paths (pores) 15 and transferred. On the other hand, the ions that attempt passing through the second fine paths (pores) 16 can readily reach the first fine paths (pores) 15 formed in the vicinity of the second fine paths (pores) 16, and hence, the ions can be transferred through the first fine paths (pores) 15.Type: GrantFiled: April 1, 2002Date of Patent: June 1, 2004Assignee: Sanyo Electric Co., Ltd.Inventors: Atsumu Imasato, Takaaki Ikemachi
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Patent number: 6645672Abstract: The present invention provides an alkaline storage battery excellent in both charge properties and discharge properties. A novel alkaline storage battery is provided comprising an active positive electrode material containing nickel hydroxide as a main component and an alkaline electrolyte containing at least Li+ and Na+, characterized in that the positive electrode contains Y and/or Y compound and the alkaline electrolyte has an Li+ content of from not lower than 0.1 to less than 1.0 N and an Na+ content of from 0.3 to 1.5 N.Type: GrantFiled: March 27, 2001Date of Patent: November 11, 2003Assignee: Sanyo Electric Co., Ltd.Inventors: Shigekazu Yasuoka, Yoshinori Yokoyama, Atsumu Imasato, Takaaki Ikemachi
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Publication number: 20020177045Abstract: The separator 10a for use in the alkaline storage battery of the invention comprises densely and uniformly formed over the entire separator and entrained from the surface to the back plane of the separator, first fine paths (pores) 15 rendered hydrophilic and second fine paths (pores) 16 rendered non-hydrophilic. In this manner, the gas generated in the vicinity of the first fine paths (pores) 15 can immediately reach the second fine paths (pores) 16 formed in the vicinity of the first fine paths (pores) 15 and transferred. On the other hand, the ions that attempt passing through the second fine paths (pores) 16 can readily reach the first fine paths (pores) 15 formed in the vicinity of the second fine paths (pores) 16, and hence, the ions can be transferred through the first fine paths (pores) 15.Type: ApplicationFiled: April 1, 2002Publication date: November 28, 2002Inventors: Atsumu Imasato, Takaaki Ikemachi
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Patent number: 6465122Abstract: An electrode body in which current collecting bodies are welded to upper and lower end surfaces of a spiral electrode group formed by interposing a separator between a positive electrode plate and a negative electrode plate is installed into a battery case. After the current collecting body is welded to the battery case, the cylindrical body is loaded on the diameter of the current collecting body, then the blade portions are welded, then the electrolytic solution is injected, and then a pair of electrodes are arranged on the port-sealing body and the battery case while bringing the bottom surface of the port-sealing body into contact with the peripheral side surface of the cylindrical body.Type: GrantFiled: August 17, 2000Date of Patent: October 15, 2002Assignee: Sanyo Electric Co., Ltd.Inventors: Kazuhiro Kitaoka, Shigeto Tamezane, Takaaki Ikemachi
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Publication number: 20010044049Abstract: The present invention provides an alkaline storage battery excellent in both charge properties and discharge properties. A novel alkaline storage battery is provided comprising an active positive electrode material containing nickel hydroxide as a main component and an alkaline electrolyte containing at least Li and Na, characterized in that the positive electrode contains Y and/or Y compound and the alkaline electrolyte has an Li content of from not lower than 0.1 to less than 1.0 N and an Na content of from 0.3 to 1.5 N.Type: ApplicationFiled: March 27, 2001Publication date: November 22, 2001Inventors: Shigekazu Yasuoka, Yoshinori Yokoyama, Atsumu Imasato, Takaaki Ikemachi
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Patent number: 6187473Abstract: A cylindrical alkaline storage battery including a spiraled electrode body composed of a pair of opposed electrodes spirally rolled up through a separator and coupled within a cylindrical casing, at least one of the electrodes being in the form of a non-sintered type electrode composed of an active material retention substrate of three dimensionally meshed structure impregnated with paste of an active material, and a current collector formed with a disc portion for connection to one end portion of the non-sintered type electrode and a lead portion for connection to a terminal, wherein the one end portion of the non-sintered type electrode is formed without impregnation of the paste of the active material, and wherein a perforated sheet metal welded to the one end portion of the non-sintered type electrode is welded at its side edge to the disc portion of the current collector.Type: GrantFiled: November 18, 1998Date of Patent: February 13, 2001Assignee: Sanyo Electric Co., Ltd.Inventors: Shigeto Tamezane, Takaaki Ikemachi, Takashi Yamaguchi, Satoshi Narukawa
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Patent number: 6071644Abstract: The present invention aims to provide a method of producing a hydrogen absorbing alloy electrode which is solid and enables a metal hydride storage cell, using the hydrogen absorbing alloy electrode, with high discharge characteristics in high-rate discharge and in low temperature and a long cycle life. To achieve this, the hydrogen absorbing alloy electrode is produced by firstly generating a first powder by giving a surface treatment to a hydrogen absorbing alloy powder in an acid solution, secondly generating a mixed material by mixing the first powder with a second powder which is composed of a metal which does not absorb hydrogen and/or an alloy which does not absorb hydrogen, thirdly attaching the mixed material to a base plate, and fourthly baking the base plate for sintering the mixed material attached to the base plate.Type: GrantFiled: October 1, 1997Date of Patent: June 6, 2000Assignee: Sanyo Electric Co., Ltd.Inventors: Takaaki Ikemachi, Takashi Yamaguchi, Hideki Okajima, Shigeto Tamezane
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Patent number: 5902700Abstract: A hydrogen storage alloy electrode for use in electrochemical hydrogen storage cells, the electrode being in the form of a negative electrode fabricated by sintering a mixture of a hydrogen storage alloy containing manganese and an alloy containing a measured amount of manganese.Type: GrantFiled: January 21, 1998Date of Patent: May 11, 1999Assignee: Sanyo Electric Co., Ltd.Inventors: Takamichi Hirosawa, Takaaki Ikemachi
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Patent number: 5766792Abstract: A hydrogen storage alloy electrode for use in electro-chemical hydrogen storage cells, the electrode being in the form of a negative electrode fabricated by sintering a mixture of a hydrogen storage alloy containing manganese and an alloy containing a measured amount of manganese.Type: GrantFiled: September 20, 1996Date of Patent: June 16, 1998Assignee: Sanyo Electric, Co., Ltd.Inventors: Takamichi Hirosawa, Takaaki Ikemachi
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Patent number: 5578553Abstract: In the production of a 124-type or 123-type superconductor by a sol-gel method using alkoxides of respective metals, the use of a compound wherein a sec-butoxy group and a hydroxy group are coordinated with a copper atom gives a superconductor composed of flat particles having a broad C plane. The dimensional ratio defined by l/d is at least 6.7 in the case of the 124-type or is at least 8.4 in the case of the 123-type. It shows a superconducting property at a liquid nitrogen temperature. This superconductor shows a higher critical current density than one obtained by a sintering method.Type: GrantFiled: November 28, 1994Date of Patent: November 26, 1996Assignees: Kyocera Corporation, International Superconductivity Technology Center, Sanyo Electric Co., Ltd.Inventors: Shinichi Koriyama, Takaaki Ikemachi, Hisao Yamauchi