Patents by Inventor Masayuki Iwama
Masayuki Iwama 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: 7655359Abstract: A secondary battery having a feature in which a positive electrode, a negative electrode and electrolyte are provided; the negative electrode includes a negative electrode active material layer which is alloying at least at a portion of a boundary face with a negative electrode current collector; an approximately tabular electrode body structure is formed by a constitution in which a laminated body of the lamellar positive electrode and the lamellar negative electrode is wound or folded; and in the approximately tabular electrode body structure, relation of B?1.5A is satisfied when length in a perpendicular direction with respect to a bended portion of the laminated body is made to be A and length in a parallel direction with respect to the bended portion of the laminated body is made to be B.Type: GrantFiled: December 13, 2006Date of Patent: February 2, 2010Assignee: Sony CorporationInventors: Takakazu Hirose, Kenichi Kawase, Isamu Konishiike, Masayuki Iwama, Koichi Matsumoto
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Publication number: 20090291371Abstract: A secondary battery having high cycle characteristics is provided. The secondary battery includes a cathode, an anode, and an electrolyte. In the anode, an anode active material layer containing silicon, carbon, and oxygen as an anode active material is provided on an anode current collector. In the anode active material, a content of carbon is from 0.2 atomic % to 10 atomic % both inclusive, and a content of oxygen is from 0.5 atomic % to 40 atomic % both inclusive. A ratio from 0.1% to 17.29% both inclusive of the silicon contained in the anode active material exists as Si—C bond.Type: ApplicationFiled: May 20, 2009Publication date: November 26, 2009Applicant: Sony CorporationInventors: Isamu KONISHIIKE, Kotaro SATORI, Kenichi KAWASE, Shunsuke KURASAWA, Koichi MATSUMOTO, Takakazu HIROSE, Masayuki IWAMA, Takashi FUJINAGA
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Publication number: 20090148778Abstract: A battery having a high charge and discharge efficiency in which a spirally wound electrode body having a lamination structure of a cathode, an anode 80, and a separator is contained in a battery can. The anode has a structure in which an anode active material layer is provided on an anode current collector. The anode active material layer has a plurality of anode active material particles containing silicon, and the surface of the anode active material particles is covered with a compound film having a Si—O bond and a Si—N bond. Therefore, chemical stability of the anode is improved, and decomposition of an electrolytic solution can be prevented.Type: ApplicationFiled: December 2, 2008Publication date: June 11, 2009Applicant: SONY CORPORATIONInventors: Kenichi Kawase, Koichi Matsumoto, Hideki Nakai, Masayuki Iwama, Akinori Kita, Shunsuke Kurasawa, Isamu Konishiike, Takakazu Hirose
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Publication number: 20090061326Abstract: A battery capable of improving the cycle characteristics is provided. A current collector containing copper (Cu), in which ratio I(200)/I(111) between intensity I (200) of a peak originated in (200) crystal plane of copper obtained by X-ray diffraction and intensity I (111) of a peak originated in (111) crystal plane thereof is in the range from 0.5 to 1.5.Type: ApplicationFiled: May 20, 2008Publication date: March 5, 2009Applicant: SONY CORPORATIONInventors: Takakazu Hirose, Masayuki Iwama, Kenichi Kawase
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Patent number: 7494743Abstract: An anode capable of relaxing internal stress and thereby preventing deformation and a battery using it are provided. An anode provided with an anode active material layer is formed on an anode current collector. The anode active material layer has active material particles containing silicon (Si) as an element, and at least some of the active material particles contain a polymer component in the particle.Type: GrantFiled: September 21, 2006Date of Patent: February 24, 2009Assignee: Sony CorporationInventors: Takakazu Hirose, Masayuki Iwama, Isamu Konishiike, Kenichi Kawase
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Patent number: 7476464Abstract: A negative electrode wherein a negative electrode current collector has a conductive foil including a conductive substrate and a multiplicity of conductive lumpy projections provided at a surface of the substrate is provided. The multiplicity of lumpy projections are so disposed that a plurality of the lumpy projections are aligned substantially in one direction to form a lumpy projection row and that a plurality of the lumpy projection rows are arrayed side by side at a predetermined interval in a direction substantially orthogonal to the one direction.Type: GrantFiled: July 25, 2007Date of Patent: January 13, 2009Assignee: Sony CorporationInventors: Takakazu Hirose, Masayuki Iwama, Kenichi Kawase
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Publication number: 20080305395Abstract: A battery capable of improving cycle characteristics is provided. An anode includes: an anode current collector, and an anode active material layer arranged on the anode current collector, in which the anode active material layer includes an anode active material including silicon (Si), and including a pore group with a diameter ranging from 3 nm to 50 nm both inclusive, and the volumetric capacity per unit weight of silicon of the pore group with a diameter ranging from 3 nm to 50 nm both inclusive is 0.2 cm3/g or less, the volumetric capacity being measured by mercury porosimetry using a mercury porosimeter.Type: ApplicationFiled: June 4, 2008Publication date: December 11, 2008Applicant: Sony CorporationInventors: Takakazu Hirose, Kenichi Kawase, Isamu Konishiike, Shunsuke Kurasawa, Masayuki Iwama, Koichi Matsumoto
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Publication number: 20080305391Abstract: A battery capable of improving cycle characteristics and a manufacturing yield is provided. An anode includes: an anode current collector; and an anode active material layer arranged on the anode current collector, in which the anode active material layer includes an anode active material including a plurality of pores, and the rate of change in the amount of mercury intruded into the plurality of pores is distributed so as to have a peak in a diameter range from 80 nm to 1200 nm both inclusive, the amount of mercury intruded being measured by mercury porosimetry.Type: ApplicationFiled: June 4, 2008Publication date: December 11, 2008Applicant: SONY CORPORATIONInventors: Takakazu Hirose, Kenichi Kawase, Isamu Konishiike, Shunsuke Kurasawa, Masayuki Iwama, Koichi Matsumoto
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Publication number: 20080220338Abstract: A current collector forming an electrode for battery is provided. The electrode current collector includes a conductive layer made of copper or a copper alloy. Furthermore, the conductive layer has a plurality of crystallites, the crystallites containing crystallites having a cross-section area of 20 ?m2 or more.Type: ApplicationFiled: June 25, 2007Publication date: September 11, 2008Applicant: SONY CORPORATIONInventors: Masayuki Iwama, Rikako Imoto, Kenichi Kawase, Akinori Kita
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Publication number: 20080206651Abstract: A battery having a high charge and discharge efficiency is provided. An anode being provided with an anode active material layer on an anode current collector, in which the anode active material layer contains silicon as an anode active material and includes a compound film having Si—O bond and Si—N bond on at least part of the surface of the anode active material layer.Type: ApplicationFiled: February 15, 2008Publication date: August 28, 2008Applicant: Sony CorporationInventors: Kenichi Kawase, Koichi Matsumoto, Hideki Nakai, Masayuki Iwama, Akinori Kita, Shunsuke Kurasawa, Isamu Konishiike, Takakazu Hirose
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Publication number: 20080176133Abstract: An anode capable of relaxing the stress due to expansion and shrinkage and a battery using the anode are provided. In the anode, an anode active material layer containing at least one of silicon and tin as an element is provided on both faces of a strip-shaped anode current collector. In the anode current collector and the anode active material layer, at least one penetrating portion that is cut out or slit to penetrate the anode current collector and the anode active material layer is formed to extend to include a longitudinal component of the anode current collector.Type: ApplicationFiled: April 3, 2007Publication date: July 24, 2008Applicant: SONY CORPORATIONInventors: Takakazu Hirose, Kenichi Kawase, Isamu Konishiike, Masayuki Iwama, Koichi Matsumoto
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Publication number: 20080176132Abstract: An anode capable of relaxing the stress concentration and improving the characteristics and a battery using it are provided. The anode includes an anode current collector and an anode active material layer containing silicon (Si) as an element, wherein an anode active material layer has a metal element increasing and decreasing region in which a metal element is contained as an element, and a concentration of the metal element is increased and then decreased in a thickness direction.Type: ApplicationFiled: March 12, 2007Publication date: July 24, 2008Inventors: Takakazu Hirose, Masayuki Iwama, Koichi Matsumoto, Isamu Konishiike, Kenichi Kawase
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Publication number: 20080176144Abstract: A current collector forming an electrode for battery. The electrode current collector is made of copper or a copper alloy, and has a front surface color and a back surface color, at least one color of which is a color belonging to a color space represented by: 50?L*?80, 5?a*<60, 5?b*<60, where L*, a*, and b* are numeric values determined based on the L*a*b* calorimetric system described in JIS Z 8729.Type: ApplicationFiled: June 25, 2007Publication date: July 24, 2008Applicant: SONY CORPORATIONInventors: Masayuki Iwama, Kenichi Kawase, Rikako Imoto, Akinori Kita, Kotaro Satori
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Publication number: 20080145752Abstract: A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The anode includes an anode active material layer containing an anode active material having silicon as an element, and a coating layer that coats the anode active material layer, and contains an oxide of a 3d transition metal element at least one selected from the group consisting of iron, cobalt, and nickel.Type: ApplicationFiled: October 31, 2007Publication date: June 19, 2008Applicant: Sony CorporationInventors: Takakazu Hirose, Masayuki Iwama, Kenichi Kawase
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Publication number: 20080138716Abstract: A battery realizing the superior cycle characteristics is provided. An electrode includes a current collector including an active-material-layer-formation region and a flat and smooth region having a surface roughness smaller than that of the active-material-layer-formation region, and an active material layer provided in the active-material-layer-formation region of the current collector. An electrode lead is connected to the flat and smooth region.Type: ApplicationFiled: November 28, 2007Publication date: June 12, 2008Applicant: SONY CORPORATIONInventors: Masayuki Iwama, Kenichi Kawase, Yoshikazu Kato, Nozomu Morita
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Publication number: 20080113270Abstract: An anode capable of preventing expansion of an anode active material layer and a battery using it are provided. The anode includes an anode current collector, and an anode active material layer containing silicon (Si) as an element, wherein the anode active material layer therein contains at least one selected from the group consisting of a fluoride of an alkali metal and a fluoride of an alkali earth metal.Type: ApplicationFiled: March 12, 2007Publication date: May 15, 2008Inventors: Takakazu Hirose, Kenichi Kawase, Isamu Konishiike, Masayuki Iwama
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Publication number: 20080050652Abstract: A negative electrode wherein a negative electrode current collector has a conductive foil including a conductive substrate and a multiplicity of conductive lumpy projections provided at a surface of the substrate is provided. The multiplicity of lumpy projections are so disposed that a plurality of the lumpy projections are aligned substantially in one direction to form a lumpy projection row and that a plurality of the lumpy projection rows are arrayed side by side at a predetermined interval in a direction substantially orthogonal to the one direction.Type: ApplicationFiled: July 25, 2007Publication date: February 28, 2008Applicant: SONY CORPORATIONInventors: Takakazu Hirose, Masayuki Iwama, Kenichi Kawase
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Publication number: 20070231698Abstract: A current collector includes a first principal plane and a second principal plane. In the current collector, the roughness of the first principal plane and second principal plane being mutually different.Type: ApplicationFiled: March 19, 2007Publication date: October 4, 2007Inventors: Kenichi Kawase, Isamu Konishiike, Tomoo Takada, Masayuki Iwama, Nozomu Morita, Yoshikazu Kato
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Publication number: 20070154806Abstract: A secondary battery having a feature in which a positive electrode, a negative electrode and electrolyte are provided; the negative electrode includes a negative electrode active material layer which is alloying at least at a portion of a boundary face with a negative electrode current collector; an approximately tabular electrode body structure is formed by a constitution in which a laminated body of the lamellar positive electrode and the lamellar negative electrode is wound or folded; and in the approximately tabular electrode body structure, relation of B?1.5A is satisfied when length in a perpendicular direction with respect to a bended portion of the laminated body is made to be A and length in a parallel direction with respect to the bended portion of the laminated body is made to be B.Type: ApplicationFiled: December 13, 2006Publication date: July 5, 2007Inventors: Takakazu Hirose, Kenichi Kawase, Isamu Konishiike, Masayuki Iwama, Koichi Matsumoto
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Publication number: 20070111103Abstract: A current collector capable of relaxing stress and of improving charcteristics, an anode using the current collector, and a battery using the current collector are provided. An active material layer containing Si is provided on a current collector. The current collector contains Cu. Where a peak area resulting from (220) crystal face of Cu obtained by X-ray diffraction is I220, and a peak area resulting from (200) crystal face of Cu obtained by X-ray diffraction is I200, ratio I220/I200 as a ratio of the peak area I200 to the peak area I200 is 2.5 or less. Thereby, even when the active material layer is expanded and shrunk due to charge and discharge, the stress can be relaxed, and separation or the like of the active material layer can be prevented.Type: ApplicationFiled: November 13, 2006Publication date: May 17, 2007Inventors: Isamu Konishiike, Kotaro Satori, Kenichi Kawase, Takakazu Hirose, Masayuki Iwama