Patents by Inventor Koji Utsugi
Koji Utsugi 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: 9583789Abstract: The present invention relates to a non-aqueous electrolyte comprising a non-aqueous electrolyte solvent, a supporting salt, and a sulfonate represented by a predetermined formula, the non-aqueous electrolyte having a sulfonate concentration of 0.001 wt % or more and less than 0.2 wt % based on the total mass of the non-aqueous electrolyte.Type: GrantFiled: June 26, 2013Date of Patent: February 28, 2017Assignee: NEC CorporationInventors: Hitoshi Ishikawa, Akinobu Nakamura, Koji Utsugi
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Publication number: 20150155597Abstract: The present invention relates to a non-aqueous electrolyte comprising a non-aqueous electrolyte solvent, a supporting salt, and a sulfonate represented by a predetermined formula, the non-aqueous electrolyte having a sulfonate concentration of 0.001 wt % or more and less than 0.2 wt % based on the total mass of the non-aqueous electrolyte.Type: ApplicationFiled: June 26, 2013Publication date: June 4, 2015Applicant: NEC CorporationInventors: Hitoshi Ishikawa, Akinobu Nakamura, Koji Utsugi
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Patent number: 9012071Abstract: There is provided a lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability. An electrolyte solution for secondary battery comprising at least an aprotic solvent having an electrolyte dissolved therein and a compound represented by the general formula (1).Type: GrantFiled: December 10, 2012Date of Patent: April 21, 2015Assignee: NEC CorporationInventors: Koji Utsugi, Yuki Kusachi, Tsuyoshi Katou
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Patent number: 8455142Abstract: A non-aqueous electrolyte can suppress decomposition of a solvent, improve the cycle life of a secondary battery, suppress the rise of resistance of a secondary battery and improve the capacity maintenance ratio of a secondary battery.Type: GrantFiled: April 7, 2009Date of Patent: June 4, 2013Assignee: NEC Energy Devices, Ltd.Inventors: Hitoshi Ishikawa, Yasutaka Kono, Koji Utsugi, Yoko Hashizume, Shinako Kaneko, Hiroshi Kobayashi
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Patent number: 8445144Abstract: There is provided a lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability. An electrolyte solution for secondary battery comprising at least an aprotic solvent having an electrolyte dissolved therein and a compound represented by the general formula (1).Type: GrantFiled: December 15, 2004Date of Patent: May 21, 2013Assignee: NEC CorporationInventors: Koji Utsugi, Yuki Kusachi, Tsuyoshi Katou
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Patent number: 8357471Abstract: There is provided a lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability. An electrolyte solution for secondary battery comprising at least an aprotic solvent having an electrolyte dissolved therein and a compound represented by the general formula (1).Type: GrantFiled: October 17, 2011Date of Patent: January 22, 2013Assignee: NEC CorporationInventors: Koji Utsugi, Yuki Kusachi, Tsuyoshi Katou
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Patent number: 8227116Abstract: A lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability is provided. The secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution comprising an aprotic solvent having at least an electrolyte dissolved therein, wherein the positive electrode comprises a lithium-manganese composite oxide having a spinel structure as a positive electrode active material, and the electrolyte solution comprises a compound represented by the general formula (1).Type: GrantFiled: December 14, 2004Date of Patent: July 24, 2012Assignee: NEC CorporationInventors: Daisuke Kawasaki, Yuki Kusachi, Tatsuji Numata, Koji Utsugi
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Publication number: 20120115037Abstract: The present invention provides a polymer gel electrolyte capable of inhibiting the cell expansion of a polymer secondary battery and improving the cycle characteristics and high-temperature storage characteristics of a polymer secondary battery. The present invention relates to a polymer gel electrolyte comprising an aprotic solvent; a supporting salt; a cyclic sulfonic acid ester which includes at least two sulfonyl groups; and a crosslinked polymer obtained by crosslinking a methacrylic acid ester polymer represented by general formula (1) below. In the general formula (1), n meets 1800<n<3000 and m meets 350<m<600.Type: ApplicationFiled: July 9, 2009Publication date: May 10, 2012Applicants: DAI-ICHI KOGYO SEIYAKU CO., LTD., NEC ENERGY DEVICES, LTD.Inventors: Yasutaka Kono, Koji Utsugi, Hiroshi Kobayashi, Hitoshi Ishikawa, Manabu Kikuta, Michiyuki Kono
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Publication number: 20120034517Abstract: There is provided a lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability. An electrolyte solution for secondary battery comprising at least an aprotic solvent having an electrolyte dissolved therein and a compound represented by the general formula (1).Type: ApplicationFiled: October 17, 2011Publication date: February 9, 2012Applicant: NEC CORPORATIONInventors: Koji UTSUGI, Yuki KUSACHI, Tsuyoshi KATOU
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Publication number: 20110159379Abstract: An object of this invention is to provide a highly safe secondary battery employing a non-flammable electrolyte solution. The secondary battery has a positive pole comprising an oxide for storing and releasing lithium ions, a negative pole comprising a carbon material for storing and releasing lithium ions, and an electrolyte solution. The electrolyte solution comprises 1.5 mol/L or more of a lithium salt, or 1.0 mol/L or more of a lithium salt and 20% by volume or more of a phosphate ester derivative.Type: ApplicationFiled: September 11, 2009Publication date: June 30, 2011Applicants: NEC CORPORATION, NEC ENERGY DEVICES, LTD.Inventors: Kazuaki Matsumoto, Kentaro Nakahara, Shigeyuki Iwasa, Kaichiro Nakano, Koji Utsugi, Hitoshi Ishikawa, Shinako Kaneko
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Publication number: 20110070504Abstract: This invention relates to a highly safe secondary battery. In the secondary battery of this invention, a positive electrode is formed of an oxide which adsorbs/desorbs lithium ions; a negative electrode is formed of a carbon material which adsorbs/desorbs lithium ions; and an electrolyte solution is formed of an ion liquid and a phosphoric acid ester derivative. Consequently, the secondary battery can be highly safe. Since a phosphate ester and an ion liquid are contained at the same time, high discharge capacity can be maintained even when the phosphate ester is used at a high concentration.Type: ApplicationFiled: May 14, 2009Publication date: March 24, 2011Applicants: NEC CORPORATION, NEC ENERGY DEVICES, LTD.Inventors: Kazuaki Matsumoto, Kentaro Nakahara, Shigeyuki Iwasa, Hitoshi Ishikawa, Shinako Kaneko, Koji Utsugi
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Patent number: 7662519Abstract: The present invention provides a non-aqueous electrolyte secondary battery having excellent properties such as energy density and electromotive force and being excellent in cycle life, storage property and safety. In the present invention, the non-aqueous electrolyte secondary battery comprises a substance having a peak from 162.9 to 164.0 eV by XPS analysis on the anode surface.Type: GrantFiled: August 11, 2004Date of Patent: February 16, 2010Assignee: NEC CorporationInventors: Yuki Kusachi, Koji Utsugi
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Patent number: 7608364Abstract: This invention provides a lithium ion secondary battery comprising a cathode, an anode and an nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein the anode comprises a non-graphitizable carbon as an anode activator; and the nonaqueous electrolytic solution comprises at least one anode protecting component selected from the group consisting of sultones having a 5- to 7-membered cyclic sulfonate structure and their substituted derivatives as well as vinylene carbonates and their substituted derivatives.Type: GrantFiled: December 22, 2003Date of Patent: October 27, 2009Assignee: NEC CorporationInventors: Junko Nishiyama, Tamaki Miura, Koji Utsugi
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Publication number: 20090253049Abstract: A non-aqueous electrolyte can suppress decomposition of a solvent, improve the cycle life of a secondary battery, suppress the rise of resistance of a secondary battery and improve the capacity maintenance ratio of a secondary battery A non-aqueous electrolyte secondary battery formed by using such a non-aqueous electrolyte includes a non-aqueous electrolyte containing an aprotic solvent and a disulfonic acid ester as expressed by chemical formula 1 shown below, a positive electrode and a negative electrode:Type: ApplicationFiled: April 7, 2009Publication date: October 8, 2009Applicant: NEC TOKIN CORPORATIONInventors: Hitoshi Ishikawa, Yasutaka Kono, Koji Utsugi, Yoko Hashizume, Shinako Kaneko, Hiroshi Kobayashi
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Patent number: 7462244Abstract: A vacuum deposition apparatus is used for deposit evaporated substance from evaporation sources (6a and 6b) on the desired position of a flexible substrate (1). While the flexible substrate (1) is carried using rollers in a vacuum, shutters (8a and 8b) are opened and closed to control the movement of the evaporated substance via openings. A film having a desired shape of pattern is formed on the flexible substrate (1) with higher controllability.Type: GrantFiled: November 21, 2002Date of Patent: December 9, 2008Assignee: NEC CorporationInventors: Koji Utsugi, Hironori Yamamoto, Mariko Miyachi, Tamaki Miura, Mitsuhiro Mori, Yutaka Bannai, Ikiko Yamazaki
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Patent number: 7419747Abstract: An electrolyte for a secondary battery containing an aprotic solvent which contains at least imide anion, transition metal ion and a compound containing a sulfonyl group in an aprotic solvent 15. The electrolyte has the performance such as the excellent energy density and electromotive force, and the secondary battery using the electrolyte is excellent in the cycle life and the safety.Type: GrantFiled: December 3, 2003Date of Patent: September 2, 2008Assignee: NEC CorporationInventors: Koji Utsugi, Mitsuhiro Mori
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Patent number: 7285359Abstract: An object of the present invention is to provide a negative electrode for a secondary battery which has large capacity and restrains a rise in resistance inside the battery and reduction in capacity even after cycles and the secondary battery using the same. A first active material layer 2a comprising members occluding and releasing Li onto a collector 1a is formed and a second active material layer 3a as an alloy layer containing metal forming alloy with lithium or lithium and metal not-forming alloy with lithium is formed thereon. The secondary battery is constituted using the negative electrode.Type: GrantFiled: January 22, 2003Date of Patent: October 23, 2007Assignee: NEC CorporationInventors: Hironori Yamamoto, Mitsuhiro Mori, Jiro Iriyama, Mariko Miyachi, Koji Utsugi, Yutaka Bannai, Tamaki Miura, Ikiko Yamazaki
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Publication number: 20070212613Abstract: A polymer gel electrolyte, comprising a polymer gel including an aprotic organic solvent, a carrier salt and a sulfur-containing organic compound having at least one —O—SO2— in its chemical structure, for instance, a straight-chain sulfonic acid ester or a cyclic sulfonic acid ester, and a lithium polymer secondary battery using the polymer gel electrolyte and having improved rate performance and cycle performance.Type: ApplicationFiled: March 8, 2007Publication date: September 13, 2007Applicant: NEC TOKIN CORPORATIONInventors: Junichi Ishida, Yasutaka Kouno, Koji Utsugi, Hitoshi Ishikawa, Hiroshi Kobayashi, Shinako Kaneko
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Publication number: 20070154815Abstract: A lithium secondary battery which has excellent characteristics such as energy density and electromotive force and is excellent in cycle life and storage stability is provided. The secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution comprising an aprotic solvent having at least an electrolyte dissolved therein, wherein the positive electrode comprises a lithium-manganese composite oxide having a spinel structure as a positive electrode active material, and the electrolyte solution comprises a compound represented by the general formula (1).Type: ApplicationFiled: December 14, 2004Publication date: July 5, 2007Applicant: NEC CORPORATIONInventors: Daisuke Kawasaki, Yuki Kusachi, Tatsuji Numata, Koji Utsugi
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Patent number: 7202000Abstract: An anode for a secondary battery capable of inserting and extracting a lithium ion having a multi-layered structure including a first anode layer containing carbon as a main component; a second anode layer made of a film-like material through which a lithium component passes; and a third anode layer containing lithium and/or a lithium-containing compound as a main component. The battery capacity of the lithium ion battery is substantially increased while the higher charge-discharge efficiency and the stable cycle performance are maintained.Type: GrantFiled: July 31, 2002Date of Patent: April 10, 2007Assignee: NEC CorporationInventors: Jiro Iriyama, Hironori Yamamoto, Tamaki Miura, Koji Utsugi, Masato Shirakata, Mitsuhiro Mori