Patents by Inventor Shigeyuki Iwasa
Shigeyuki Iwasa 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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Publication number: 20140038036Abstract: In a secondary battery utilizing redox by a radical site, charge-discharge is carried out in such a manner that a lithium ion moves between a positive electrode and a negative electrode (rocking chair-type). An anion in an amount necessary for electrode doping during charge-discharge is made unnecessary, thereby reducing the amount of an electrolytic solution. A secondary battery with a large energy density is achieved. Provided is an electrode active material including at least one polymer including a radical site capable of being converted into a first cation, and an anion site capable of being bonded with the first cation or a second cation.Type: ApplicationFiled: January 23, 2012Publication date: February 6, 2014Applicants: WASEDA UNIVERSITY, NEC CORPORATIONInventors: Hiroyuki Nishide, Kenichi Oyaizu, Hiroki Yakushiji, Shigeyuki Iwasa, Kentaro Nakahara
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Patent number: 8617744Abstract: There can be provided an energy storage device comprising a positive electrode comprising a nitroxyl compound having a nitroxyl cation partial structure in an oxidized state and having a nitroxyl radical partial structure in a reduced state; a negative electrode comprising a carbon material which lithium ions can be reversibly intercalated into and deintercalated from; and an electrolytic solution comprising a lithium salt and an aprotic organic solvent, wherein the negative electrode is a negative electrode comprising the carbon material which lithium ions are previously intercalated into, apart from lithium ions associated with a capacity A of lithium capable of being intercalated and deintercalated in charge and discharge, thereby allowing the energy storage device to simultaneously achieve high energy density, high output characteristics, low environmental load, and high stability in charge and discharge cycles.Type: GrantFiled: May 26, 2010Date of Patent: December 31, 2013Assignee: NEC CorporationInventors: Kentaro Nakahara, Shigeyuki Iwasa, Masahiro Suguro, Kazuaki Matsumoto, Kaichiro Nakano
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Patent number: 8475956Abstract: An exemplary embodiment provides: a composite of an electrode active material and an electric conductivity-imparting agent, which has a high capacity density and can produce a large current; a method for producing it; and a battery which has a high energy density and can produce a large output. Specifically, a polyradical compound as the electrode active material and a conductive material are heated and mixed at a temperature of not less than the softening temperature of the polyradical compound and less than the decomposition temperature thereof to form a composite of the polyradical compound and the conductive material. Fabricating an electrode using the composite can provide a novel battery having a high energy density and a large output.Type: GrantFiled: January 21, 2008Date of Patent: July 2, 2013Assignee: NEC CorporationInventors: Yuki Kusachi, Masahiro Suguro, Shigeyuki Iwasa
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Patent number: 8242213Abstract: In the present invention, in order to provide an electrode active material that has a high capacity density and from which a large current can be extracted and to provide a battery that has a high energy density and produces a large output, in a battery comprising at least a cathode, an anode and an electrolyte, a polyradical compound having a partial structure represented by the following general formula (2) is used as an electrode active material for at least one of the cathode and the anode, wherein, in the formula (2), R1 to R3 independently represent a hydrogen atom or a methyl group; and R4 to R7 independently represent an alkyl group having 1 to 3 carbon atoms.Type: GrantFiled: March 21, 2011Date of Patent: August 14, 2012Assignee: NEC CorporationInventors: Masahiro Suguro, Shigeyuki Iwasa, Jirou Iriyama, Kentaro Nakahara, Masaharu Satou
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Publication number: 20120178023Abstract: Photoresist material for lithography using a light of 220 nm or less comprising at least a polymer represented by following formula (2) and a photo-acid generator for generating an acid by exposure: wherein R1, R2, R3 and R5, each a hydrogen atom or a methyl group; R4, an acid-labile group or one of a specified subset of alicyclic hydrocarbon groups, alicyclic hydrocarbon groups, or hydrocarbon groups; R6, a hydrogen atom, a specified subset of hydrocarbon groups or alicyclic hydrocarbon groups; x, y and z are optional values which meet x+y+z=1, 0<x?1, 0?y<1 and 0?z<1; resin having a (meth)acrylate unit of an alicyclic lactone structure represented by formula (3): wherein R8, a hydrogen atom or a methyl group, and R9, one of a specified subset of hydrocarbon groups.Type: ApplicationFiled: December 23, 2011Publication date: July 12, 2012Inventors: Katsumi Maeda, Shigeyuki Iwasa, Kaichiro Nakano, Etsuo Hasegawa
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Publication number: 20120171561Abstract: The object of the present invention is to provide an electrode material which enables the production of an electricity storage device that has a large discharge capacity, and suffers minimal voltage drop due to resistance even when discharge is performed at a large electric current; a method for producing the electrode material; and an electricity storage device that exhibits both high energy density and high output characteristics, and an electricity storage device is produced which uses, as an electrode, a polymer radical material-activated carbon-conductive material composite, prepared by adding dropwise, or pouring, a raw material solution, in which a polymer radical material having a radical partial structure in a reduced state is dissolved or swollen and an activated carbon and a conductive material are dispersed or dissolved, into a solution in which the polymer radical material, the activated carbon and the conductive material do not dissolve or swell, thus obtaining a precipitate containing the polymType: ApplicationFiled: August 16, 2010Publication date: July 5, 2012Applicant: NEC CORPORATIONInventors: Shigeyuki Iwasa, Kentaro Nakahara, Masahiro Suguro, Motoharu Yasui
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Publication number: 20120100437Abstract: There can be provided an energy storage device comprising a positive electrode comprising a nitroxyl compound having a nitroxyl cation partial structure in an oxidized state and having a nitroxyl radical partial structure in a reduced state; a negative electrode comprising a carbon material which lithium ions can be reversibly intercalated into and deintercalated from; and an electrolytic solution comprising a lithium salt and an aprotic organic solvent, wherein the negative electrode is a negative electrode comprising the carbon material which lithium ions are previously intercalated into, apart from lithium ions associated with a capacity A of lithium capable of being intercalated and deintercalated in charge and discharge, thereby allowing the energy storage device to simultaneously achieve high energy density, high output characteristics, low environmental load, and high stability in charge and discharge cycles.Type: ApplicationFiled: May 26, 2010Publication date: April 26, 2012Applicant: NEC CORPORATIONInventors: Kentaro Nakahara, Shigeyuki Iwasa, Masahiro Suguro, Kazuaki Matsumoto, Kaichiro Nakano
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Publication number: 20120095179Abstract: The present invention provides a pyrroline nitroxide polymer, an electrode active material containing the polymer, and a cell utilizing the electrode active material. The present invention is a pyrroline nitroxide polymer obtainable by polymerization of a pyrroline nitroxide compound represented by Formula (1).Type: ApplicationFiled: March 5, 2010Publication date: April 19, 2012Applicants: WASEDA UNIVERSITY, NEC CORPORATION, SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Hiroyuki Nishide, Kenichi Oyaizu, Takeshi Kawamoto, Nobutaka Fujimoto, Yuji Kinpara, Shigeyuki Iwasa, Kentaro Nakahara
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Patent number: 8119751Abstract: A photoresist material for lithography using a light of 220 nm or less which comprises at least a polymer represented by the following formula (2) and a photo-acid generator for generating an acid by exposure: wherein R1, R2, R3 and R5 are each a hydrogen atom or a methyl group; R4 is an acid-labile group or one of a specified subset of alicyclic hydrocarbon groups, alicyclic hydrocarbon groups, or hydrocarbon groups; R6 is a hydrogen atom or one of a specified subset of hydrocarbon groups or alicyclic hydrocarbon groups; x, y and z are optional values which meet x+y+z=1, 0<x?1, 0?y<1 and 0?z<1. Also disclosed is a resin having a (meth)acrylate unit of an alicyclic lactone structure represented by the formula (3): wherein R8 is a hydrogen atom or a methyl group, and R9 is one of a specified subset of hydrocarbon groups.Type: GrantFiled: August 29, 2008Date of Patent: February 21, 2012Assignee: NEC CorporationInventors: Katsumi Maeda, Shigeyuki Iwasa, Kaichiro Nakano, Etsuo Hasegawa
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Publication number: 20110196122Abstract: There are here disclosed a photoresist material for lithography using a light of 220 nm or less which comprises at least a polymer represented by the following formula (2) and a photo-acid generator for generating an acid by exposure: wherein R1, R2, R3 and R5 are each a hydrogen atom or a methyl group; R4 is an acid-labile group, an alicyclic hydrocarbon group having 7 to 13 carbon atoms, which has an acid labile group, an alicyclic hydrocarbon group having 7 to 13 carbon atoms, which has a carboxyl group, or a hydrocarbon group having 3 to 13 carbon atoms, which has an epoxy group; R6 is a hydrogen atom, a hydrocarbon group having 1 to 12 carbon atoms, or an alicyclic hydrocarbon group having 7 to 13 carbon atoms, which has a carboxyl group; x, y and z are optional values which meet x+y+z=1, 0<x?1, 0?y<1 and 0?z<1; and a weight-average molecular weight of the polymer is in the range of 2000 to 200000, and a resin having a (meth)acrylate unit of an alicyclic lactone structure represented by theType: ApplicationFiled: April 15, 2011Publication date: August 11, 2011Inventors: Katsumi Maeda, Shigeyuki Iwasa, Kaichiro Nakano, Etsuo Hasegawa
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Publication number: 20110172378Abstract: In the present invention, in order to provide an electrode active material that has a high capacity density and from which a large current can be extracted and to provide a battery that has a high energy density and produces a large output, in a battery comprising at least a cathode, an anode and an electrolyte, a polyradical compound having a partial structure represented by the following general formula (2) is used as an electrode active material for at least one of the cathode and the anode, wherein, in the formula (2), R1 to R3 independently represent a hydrogen atom or a methyl group; and R4 to R7 independently represent an alkyl group having 1 to 3 carbon atoms.Type: ApplicationFiled: March 21, 2011Publication date: July 14, 2011Applicant: NEC CORPORATIONInventors: Masahiro SUGURO, Shigeyuki IWASA, Jirou IRIYAMA, Kentaro NAKAHARA, Masaharu SATOU
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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: 20110129730Abstract: A secondary battery using a polymer radical material and a conducting additive in which the performance of a conductive auxiliary layer is further improved and the internal resistance is reduced, thereby achieving a higher output. Specifically disclosed is a secondary battery in which at least one of a positive electrode and a negative electrode uses, as an electrode active material, a polymer radical material and a conducting additive having electrical conductivity. By providing a conductive auxiliary layer between a current collector and the polymer radical material/conducting additive electrode which is mainly composed of graphite, fibrous carbon or a granular carbon having a DBP absorption of not more than 110 cm3/100 g, the secondary battery with a higher output can be obtained.Type: ApplicationFiled: July 3, 2009Publication date: June 2, 2011Applicants: DIC Corporation, NEC CORPORATIONInventors: Masanori Kasai, Hiroshi Isozumi, Takayoshi Obata, Shigeyuki Iwasa, Kentaro Nakahara, Masahiro Suguro
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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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Publication number: 20100255372Abstract: Disclosed is a polyradical compound which can be used as an electrode active material for at least one of a positive electrode and a negative electrode. The polyradical compound has a repeating unit represented by general formula (1) and is crosslinked using a bifunctional crosslinking agent having two polymerizing groups in the molecule represented by general formula (2), wherein R1 to R3 each independently represent hydrogen or methyl group; R4 to R7 each independently represent C1 to C3 alkyl group; X represents single bond, linear, branched or cyclic C1 to C15 alkylenedioxy group, alkylene group, phenylenedioxy group, phenylene group or structure represented by general formula (3); and R8 to R13 each independently represent hydrogen or methyl group, and k represents an integer of 2 to 5.Type: ApplicationFiled: June 4, 2007Publication date: October 7, 2010Applicant: NEC CORPORATIONInventors: Masahiro Suguro, Shigeyuki Iwasa, Yuki Kusachi, Jiro Iriyama, Yukiko Morioka, Kentaro Nakahara, Sadahiko Miura
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Publication number: 20100009256Abstract: Disclosed is a composite body of an electrode active material and a conductivity-imparting agent, which has high capacity density and enables to take out a large current. Also disclosed are a method for producing such a composite body, and a battery having high energy density and a large output power. Specifically, a polyradical compound as an electrode active material and a conductive material are heated and mixed at a temperature not less than the softening temperature but less than the decomposition temperature of the polyradical compound, thereby for forming a composite body of the polyradical compound and the conductive material. By producing an electrode using such a composite body, there can be obtained a novel battery having high energy density and large output power.Type: ApplicationFiled: January 21, 2008Publication date: January 14, 2010Applicant: NEC CORPORATIONInventors: Yuki Kusachi, Masahiro Suguro, Shigeyuki Iwasa
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Patent number: 7642011Abstract: A radical compound may be used as an active material for an anode layer 2 to provide a novel stable secondary battery with a higher energy density and a larger capacity. The radical compound used has, for example, a spin concentration of 1021 spins/g or more.Type: GrantFiled: February 25, 2005Date of Patent: January 5, 2010Assignee: NEC CorporationInventors: Kentaro Nakahara, Masaharu Satoh, Shigeyuki Iwasa, Hiroshi Yageta, Yutaka Bannai, Yukiko Morioka, Etsuo Hasegawa
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Patent number: 7544441Abstract: A secondary battery is provided which has a high energy density, a high capacity, an excellent stability in charge-discharge cycle as well as an excellent safety. The secondary battery comprises at least a positive electrode, a negative electrode and an electrolyte, wherein an active material of at least one of the positive and negative electrodes includes at least one compound selected from the group consisting of radical compounds represented by the formula (1) or the formula (3): (in the formula (1), X1 and X2 each independently represent a group represented by the formula (3), alkoxyl group, halogen atom, hydroxyl group or cyano group, and R1˜R8 each independently represent hydrogen atom or alkyl group.) (in the formula (3), R10 represents alkyl group or substituted or unsubstituted phenyl group.Type: GrantFiled: October 18, 2002Date of Patent: June 9, 2009Assignee: NEC CorporationInventors: Shigeyuki Iwasa, Kentaro Nakahara, Yukiko Morioka, Jiro Iriyama, Masaharu Satoh
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Publication number: 20090023878Abstract: There are here disclosed a photoresist material for lithography using a light of 220 nm or less which comprises at least a polymer represented by the following formula (2) and a photo-acid generator for generating an acid by exposure: wherein R1, R2, R3 and R5 are each a hydrogen atom or a methyl group; R4 is an acid-labile group, an alicyclic hydrocarbon group having 7 to 13 carbon atoms, which has an acid labile group, an alicyclic hydrocarbon group having 7 to 13 carbon atoms, which has a carboxyl group, or a hydrocarbon group having 3 to 13 carbon atoms, which has an epoxy group; R6 is a hydrogen atom, a hydrocarbon group having 1 to 12 carbon atoms, or an alicyclic hydrocarbon group having 7 to 13 carbon atoms, which has a carboxyl group; x, y and z are optional values which meet x+y+z=1, 0<x?1, 0?y<1 and 0?z<1; and a weight-average molecular weight of the polymer is in the range of 2000 to 200000, and a resin having a (meth)acrylate unit of an alicyclic lactone structure represented by theType: ApplicationFiled: August 29, 2008Publication date: January 22, 2009Inventors: Katsumi Maeda, Shigeyuki Iwasa, Kaichiro Nakano, Etsuo Hasegawa
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Patent number: 7476465Abstract: An object of the present invention is to provide a battery which is high in capacity density and superior in stability. An electrode containing a compound having a diazine-N,N?-dioxide structure shown by a general formula (1) described below as an electrode active material is used, where x, y, x?, and y? independently shows integer numbers of 0 or more respectively, and the order of condensation of diazine rings and benzene rings may be alternate or random. One of substituents R1, R2, R3, R4, Ra, Rb, Rc, and Rd shows a part of main chain or side chain of oligomer or polymer, and the other independently shows hydrogen atom, halogen atom, or a specific group.Type: GrantFiled: February 18, 2003Date of Patent: January 13, 2009Assignee: NEC CorporationInventors: Yukiko Morioka, Masahiro Suguro, Kentaro Nakahara, Jiro Iriyama, Shigeyuki Iwasa, Masaharu Satoh