Patents by Inventor Eriko Ishiko
Eriko Ishiko 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: 9225037Abstract: A flame-retardant lithium secondary battery is provided that has better battery performance and higher safety than conventional batteries. The lithium secondary battery uses a positive electrode that includes a positive electrode active material of the general formula (1) below, and a nonaqueous electrolytic solution in which an ionic liquid that contains bis(fluorosulfonyl)imide anions as an anionic component is used as the solvent, (1) LiNixMnyO4, wherein x and y are values that satisfy the relations x+y=2, and x:y=27.572.5 to 22.577.5.Type: GrantFiled: January 17, 2011Date of Patent: December 29, 2015Assignees: Dai-Ichi Kogyo Seiyaku Co., Ltd., A School Corporation Kansai UniversityInventors: Toshinori Sugimoto, Tetsuya Higashizaki, Eriko Ishiko, Michiyuki Kono, Masashi Ishikawa
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Patent number: 9214697Abstract: An incombustible lithium secondary battery, which has excellent battery capacity and high safety, contains a separator provided between a positive electrode and a negative electrode, and a nonaqueous electrolytic solution containing a lithium salt, in which the nonaqueous electrolytic solution employs an ionic liquid as a solvent, and the separator contains an electrically insulating porous inorganic membrane and a substrate. The ionic liquid may contain a bis(fluorosulfonyl)imide anion as an anionic component, and may contain a cation containing a nitrogen atom as a cationic component.Type: GrantFiled: July 8, 2008Date of Patent: December 15, 2015Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Mari Kashima, Eriko Ishiko, Tetsuya Higashizaki
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Patent number: 9005820Abstract: The lithium secondary battery of the present invention is a lithium secondary battery including a positive electrode, a negative electrode, a separator provided between the positive electrode and the negative electrode, and a non-aqueous electrolyte containing a lithium salt, wherein the non-aqueous electrolyte includes, as a solvent, an ionic liquid containing a bis(fluorosulfonyl)imide anion as an anion component; and the separator is a nonwoven fabric comprising at least one member selected from an organic fiber and a glass fiber and has a porosity of 70% or more.Type: GrantFiled: June 8, 2010Date of Patent: April 14, 2015Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Toshinori Sugimoto, Eriko Ishiko, Tetsuya Higashizaki, Michiyuki Kono
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Patent number: 8673488Abstract: A lithium ion secondary battery capable of charging in 15 minutes or less has a cathode with a composite layer on a surface of a collector having an active material and a conducting agent, an anode with an active material, an insulator between the cathode and anode, and an electrolyte with lithium ions. The cathode active material is represented by LixMPO4, where M is a metal atom and 0<x<2 and the conducting agent contains particles between 3 ?m and 12 ?m in size and in an amount of 1% or more by weight.Type: GrantFiled: April 26, 2012Date of Patent: March 18, 2014Inventors: Tetsuya Higashizaki, Toshinori Sugimoto, Yuji Hoshihara, Eriko Ishiko
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Publication number: 20130084489Abstract: A lithium ion secondary battery capable of charging in 15 minutes or less has a cathode with a composite layer on a surface of a collector having an active material and a conducting agent, an anode with an active material, an insulator between the cathode and anode, and an electrolyte with lithium ions. The cathode active material is represented by LixMPO4, where M is a metal atom and 0<x<2 and the conducting agent contains particles between 3 ?m and 12 ?m in size and in an amount of 1% or more by weight.Type: ApplicationFiled: April 26, 2012Publication date: April 4, 2013Applicant: Dai-Ichi Kogyo Seiyaku Co., LTDInventors: Tetsuya Higashizaki, Toshinori Sugimoto, Yuji Hoshihara, Eriko Ishiko
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Publication number: 20130017456Abstract: A flame-retardant lithium secondary battery is provided that has better battery performance and higher safety than conventional batteries. The lithium secondary battery uses a positive electrode that includes a positive electrode active material of the general formula (I) below, and a nonaqueous electrolytic solution in which an ionic liquid that contains bis(fluorosulfonyl)imide anions as an anionic component is used as the solvent, (1) LiNixMny O4, wherein x and y are values that satisfy the relations x+y=2, and x:y=27.572.5 to 22.577.5.Type: ApplicationFiled: January 17, 2011Publication date: January 17, 2013Applicants: A SCHOOL CORPORATION KANSAI UNIVERSITY, DAI-ICHI KOGYO SEIYAKU CO., LTD.Inventors: Toshinori Sugimoto, Tetsuya Higashizaki, Eriko Ishiko, Michiyuki Kono, Masashi Ishikawa
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Publication number: 20120270101Abstract: A lithium ion secondary battery capable of charging in 15 minutes or less has a cathode with a composite layer on a surface of a collector having an active material and a conducting agent, an anode with an active material, an insulator between the cathode and anode, and an electrolyte with lithium ions. The cathode active material is represented by LixMPO4, where M is a metal atom and 0<x<2 and the conducting agent contains particles between 3 ?m and 12 ?m in size and in an amount of 1% or more by weight.Type: ApplicationFiled: April 26, 2012Publication date: October 25, 2012Applicant: Dai-Ichi Kogyo Seiyaku Co., LTDInventors: Tetsuya Higashizaki, Toshinori Sugimoto, Yuji Hoshihara, Eriko Ishiko
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Publication number: 20110081583Abstract: The lithium secondary battery of the present invention is a lithium secondary battery including a positive electrode, a negative electrode, a separator provided between the positive electrode and the negative electrode, and a non-aqueous electrolyte containing a lithium salt, wherein the non-aqueous electrolyte includes, as a solvent, an ionic liquid containing a bis(fluorosulfonyl)imide anion as an anion component; and the separator is a nonwoven fabric comprising at least one member selected from an organic fiber and a glass fiber and has a porosity of 70% or more.Type: ApplicationFiled: June 8, 2010Publication date: April 7, 2011Applicant: DAI-ICHI KOGYO SEIYAKU CO., LTD.Inventors: Toshinori SUGIMOTO, Eriko ISHIKO, Tetsuya HIGASHIZAKI, Michiyuki KONO
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Patent number: 7918904Abstract: A positive electrode for use in a lithium battery using water as a dispersion medium, not causing a problem of deteriorating the battery performance due to corrosion of a collector or the like and not forming unevenness on the coating surface, as well as a lithium battery using the positive electrode, the positive electrode used being formed from a positive electrode paste containing a positive electrode active material represented by the following formula (I), a binder ingredient comprising a water dispersible elastomer and a water soluble polymer as a viscosity improver, water as a dispersion medium and a dispersing agent: LixMPO4??(I) (in the general formula (I) above, M represents a metal atom containing at least one of metal atoms selected from the group consisting of Mn, Fe, Co, Ni, Cu, Mg, Zn, V, Ca, Sr, Ba, Ti, Al, Si, B and Mo, and 0<x<2).Type: GrantFiled: April 8, 2009Date of Patent: April 5, 2011Assignee: Elexcel Corporation Ltd.Inventors: Michiyuki Kono, Eriko Ishiko
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Publication number: 20100159334Abstract: An incombustible lithium secondary battery, which has excellent battery capacity and high safety, contains a separator provided between a positive electrode and a negative electrode, and a nonaqueous electrolytic solution containing a lithium salt, in which the nonaqueous electrolytic solution employs an ionic liquid as a solvent, and the separator contains an electrically insulating porous inorganic membrane and a substrate. The ionic liquid may contain a bis(fluorosulfonyl)imide anion as an anionic component, and may contain a cation containing a nitrogen atom as a cationic component.Type: ApplicationFiled: July 8, 2008Publication date: June 24, 2010Inventors: Mari Kashima, Eriko Ishiko, Tetsuya Higashizaki
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Publication number: 20090263718Abstract: A positive electrode for a lithium secondary cell is provided that is excellent in dispersibility and adhesion of the conductive agent and provides a lithium secondary cell excellent in performance. The positive electrode for a lithium secondary cell contains a positive electrode active substance represented by the following formula (I), a conductive agent and a binder, and the conductive agent has an average particle diameter of from 3 to 20 ?m measured by a laser diffraction scattering method: LixMPO4 ??(I) wherein M represents a metallic atom containing at least one member selected from the group consisting of Co, Ni, Fe, Mn, Cu, Mg, Zn, Ti, Al, Si, B and Mo; and 0<x<2.Type: ApplicationFiled: April 22, 2009Publication date: October 22, 2009Applicant: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Tetsuya Higashizaki, Eriko Ishiko
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Publication number: 20090220678Abstract: A positive electrode for use in a lithium battery using water as a dispersion medium, not causing a problem of deteriorating the battery performance due to corrosion of a collector or the like and not forming unevenness on the coating surface, as well as a lithium battery using the positive electrode, the positive electrode used being formed from a positive electrode paste containing a positive electrode active material represented by the following formula (I), a binder ingredient comprising a water dispersible elastomer and a water soluble polymer as a viscosity improver, water as a dispersion medium and a dispersing agent: LixMPO4??(I) (in the general formula (I) above, M represents a metal atom containing at least one of metal atoms selected from the group consisting of Mn, Fe, Co, Ni, Cu, Mg, Zn, V, Ca, Sr, Ba, Ti, Al, Si, B and Mo, and 0?x?2).Type: ApplicationFiled: April 8, 2009Publication date: September 3, 2009Applicant: Elexcel Corporation Ltd.Inventors: Michiyuki Kono, Eriko Ishiko
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Publication number: 20090169992Abstract: A lithium secondary battery having high performance even at the time of high-rate charging and discharging, high energy density, high voltage, and a nonaqueous electrolyte excellent in safety. The lithium secondary battery using an ionic liquid, comprising a positive electrode, a negative electrode, a separator provided between the positive electrode and the negative electrode, and a nonaqueous electrolyte containing a lithium salt, wherein the nonaqueous electrolyte uses an ionic liquid containing bis(fluorosulfonyl)imide anion as an anionic component, as a solvent, voltage at the time of full charging is 3.6V or higher, and average discharge voltage in a discharge rate of 1-hour rate is 2.9V or higher.Type: ApplicationFiled: December 11, 2006Publication date: July 2, 2009Inventors: Eriko Ishiko, Manabu Kikuta, Michiyuki Kono
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Publication number: 20060222952Abstract: A positive electrode for use in a lithium battery using water as a dispersion medium, not causing a problem of deteriorating the battery performance due to corrosion of a collector or the like and not forming unevenness on the coating surface, as well as a lithium battery using the positive electrode, the positive electrode used being formed from a positive electrode paste containing a positive electrode active material represented by the following formula (I), a binder ingredient comprising a water dispersible elastomer and a water soluble polymer as a viscosity improver, water as a dispersion medium and a dispersing agent: LixMPO4 ??(I) (in the general formula (I) above, M represents a metal atom containing at least one of metal atoms selected from the group consisting of Mn, Fe, Co, Ni, Cu, Mg, Zn, V, Ca, Sr, Ba, Ti, Al, Si, B and Mo, and 0<x<2).Type: ApplicationFiled: November 3, 2005Publication date: October 5, 2006Inventors: Michiyuki Kono, Eriko Ishiko
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Publication number: 20050229966Abstract: Provided is a dye-sensitized solar cell having improved stability of safety and performance by employing a non-volatile molten salt which makes it possible to facilitate the control over the composition of gel electrolyte, simplify the working step during production and give an excellent conversion efficiency.Type: ApplicationFiled: September 22, 2003Publication date: October 20, 2005Inventors: Ryoichi Komiya, Ryohsuke Yamanaka, Liyuan Han, Takehito Mitate, Eriko Ishiko, Michiyuki Kono
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Publication number: 20050076949Abstract: The invention provides a dye-sensitized solar cell including a transparent substrate, a transparent conductive film formed on a surface thereof, and a conductive substrate provided in a position opposed to the transparent conductive film, and further having a porous semiconductor layer, in which a dye is adsorbed, and an electrolyte between the transparent conductive film and the conductive substrate, wherein the electrolyte is a gel electrolyte containing a redox material and a solvent capable of dissolving the same in a network structure formed by crosslinking at least one kind of compound A including an isocyanate group and at least one kind of compound B including an amino group. Otherwise, the electrolyte is a gel electrolyte containing a redox material and a solvent capable of dissolving the same in a network structure formed by crosslinking at least one kind of compound A including an isocyanate group and at least one kind of compound C including a carboxyl group and/or a hydroxyl group.Type: ApplicationFiled: March 20, 2002Publication date: April 14, 2005Inventors: Ryoichi Komiya, Liyuan Han, Ryohsuke Yamanaka, Eriko Ishiko, Michiyuki Kono
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Patent number: 6399254Abstract: Provided is a solid electrolyte having a reduced amount of non-crosslinked monomers, capable of being cured rapidly to have good film-forming ability, and having high electroconductivity. The solid electrolyte is prepared by crosslinking a composition that consists essentially of a polymer compound, a solvent and an electrolytic salt through exposure to active radiations and/or under heat, in which the polymer compound has four functional polymer chains of formula (I): R1 and R2 each represent a hydrogen atom or a lower alkyl group, R3 represents a hydrogen atom or a methyl group, m and n each represent 0 or an integer of 1 or more, and m+n≧35 in one polymer chain.Type: GrantFiled: January 4, 2000Date of Patent: June 4, 2002Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Michiyuki Kono, Eriko Ishiko
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Patent number: 6329103Abstract: A solid electrolyte is disclosed, which comprises a crosslinked product of an alkylene oxide polymer having a polymerizable double bond at the terminal and/or in the side chain, and an electrolytic salt. In this, the alkylene oxide polymer is thermally crosslinked in the presence of an organic peroxide initiator having an activation energy of at most 35 Kcal/mol and having a half-value period of 10 hours at a temperature not higher than 50° C.Type: GrantFiled: July 15, 1999Date of Patent: December 11, 2001Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Eriko Ishiko, Michiyuki Kono
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Patent number: 6190804Abstract: A solid battery using a solid electrolyte obtained by dissolving a tetrafunctional high-molecular compound and an electrolyte salt in a solvent and crosslinking the solution by the irradiation of an actinic radiation and/or by heating, wherein the solid electrolyte is one obtained by using a tetrafunctional terminal acryloyl-modified alkylene oxide polymer having a high-molecular chain represented by following formula (I) as the above-described tetrafunctional high-molecular compound, compounding the solvent with the polymer at a ratio of from 220 to 1,900% by weight to the above-described tetrafunctional high-molecular compound, and crosslinking the compounded mixture: wherein R1 and R2 each represents a hydrogen atom or a lower alkyl group; R3 represents a hydrogen atom or a methyl group; m and n each represents 0 or an integer of at least 1; in one high-molecular chain, m+n≧35.Type: GrantFiled: December 1, 1998Date of Patent: February 20, 2001Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.Inventors: Eriko Ishiko, Michiyuki Kono, Tsutomu Sada