Patents by Inventor Yasuhiko Bito
Yasuhiko Bito 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: 8709660Abstract: A non-aqueous electrolyte battery including a negative electrode including metal lithium or a lithium alloy as a negative electrode active material, a positive electrode including a fluorinated graphite as a positive electrode active material, a separator provided between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The concentration ratio [F]/[C] of fluorine atoms to carbon atoms on the surface of the fluorinated graphite is 1.0 or more and less than 1.8. This improves the large-current discharge characteristics particularly in a low temperature environment.Type: GrantFiled: September 2, 2008Date of Patent: April 29, 2014Assignee: Panasonic CorporationInventors: Koshi Takamura, Yasuhiko Bito
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Patent number: 8361658Abstract: A negative electrode material for non-aqueous electrolyte secondary batteries, characterized in that the negative electrode material comprises a composite particle including solid phases A and B, the solid phase A being dispersed in the solid phase B, and the ratio (IA/IB) of the maximum diffracted X-ray intensity (IA) attributed to the solid phase A to the maximum diffracted X-ray intensity (IB) attributed to the solid phase B satisfies 0.001?IA/IB?0.1, in terms of a diffraction line obtained by a wide-angle X-ray diffraction measurement of the composite particle.Type: GrantFiled: May 6, 2010Date of Patent: January 29, 2013Assignee: Panasonic CorporationInventors: Harunari Shimamura, Toshitada Sato, Takayuki Nakamoto, Yasuhiko Bito, Yoshiaki Nitta
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Patent number: 8187754Abstract: The non-aqueous electrolyte battery of the present invention includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The negative electrode includes a molded body including Si-containing negative electrode active material particles and a conductive agent. The conductive agent includes a first conductive agent and a fibrous second conductive agent. The first conductive agent covers at least a portion of the surface of the Si-containing negative electrode active material particles, and the second conductive agent is in contact with at least two Si-containing negative electrode active material particles with the first conductive agent on the surface thereof.Type: GrantFiled: October 10, 2007Date of Patent: May 29, 2012Assignee: Panasonic CorporationInventors: Youko Sano, Yasuhiko Bito
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Patent number: 8003253Abstract: A non-aqueous electrolyte secondary battery including: a positive electrode; a negative electrode, and a non-aqueous electrolyte. The negative electrode includes a negative electrode active material that includes at least Si. The non-aqueous electrolyte includes lithium hexafluorophosphate as a main supporting electrolyte and has an acid content of not less than 50 ppm and not more than 200 ppm. The negative electrode has a potential of not less than 0.6 V and not more than 1.5 V relative to a Li electrode at an end-of-discharge voltage of the battery. The battery is prevented from suffering degradation of storage characteristics caused by the dissolution reaction of Si from the negative electrode during charging and the precipitation reaction of the dissolved Si.Type: GrantFiled: June 13, 2006Date of Patent: August 23, 2011Assignee: Panasonic CorporationInventors: Toshitada Sato, Yasuhiko Bito, Masaya Ugaji
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Patent number: 7972729Abstract: The invention includes, as a positive electrode material, active material particles comprising a lithium-containing manganese oxide represented by the general formula: Li1+aMn2?x?aMxO4+y where M is a transition metal element other than Mn, 0<x?0.5, ?0.2?y?0.5, and 0?a?0.33. The molar ratio A of M to the total of Mn and M in the surface of the active material particles and the molar ratio B of M to the total of Mn and M in the whole active material particles satisfy the relations: A/B>1.0 and A?0.3. In an X-ray diffraction analysis using CuKa radiation as an X-ray source, the intensity ratio of the largest peak of peaks attributed to an oxide of the transition metal element M to a peak around 2?=36.4° is 0.25 or less.Type: GrantFiled: July 9, 2008Date of Patent: July 5, 2011Assignee: Panasonic CorporationInventors: Teruaki Yamamoto, Shinichi Waki, Yasuhiko Bito
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Patent number: 7955735Abstract: A non-aqueous electrolyte secondary battery that has a high electrical capacity and exhibits excellent cycle characteristics even when the battery is rapidly charged and discharged at a large current includes: a positive electrode capable of reversibly absorbing and desorbing Li; a negative electrode; and a non-aqueous electrolyte. The negative electrode includes an alloying material that is capable of electrochemically absorbing and desorbing Li, and includes an A phase composed mainly of Si and a B phase including an intermetallic compound of at least one transition metal element and Si. The transition metal element is selected from the group consisting of Ti, Zr, Ni, Cu, and Fe. The A phase and/or the B phase includes a microcrystalline or amorphous region. The weight percent of the A phase relative to the total weight of the A phase and the B phase is greater than 40% and not greater than 95%.Type: GrantFiled: July 6, 2005Date of Patent: June 7, 2011Assignee: Panasonic CorporationInventors: Yasuhiko Bito, Toshitada Sato, Teruaki Yamamoto
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Patent number: 7923150Abstract: A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode active material that comprises a lithium-containing manganese oxide, and the negative electrode includes a negative electrode active material that comprises silicon and a transition metal element. When the battery voltage is 0 V, the positive electrode and the negative electrode have a potential of 1.8 V or higher relative to lithium metal (Li/Li+). Since the deterioration of the positive and negative electrode active materials is suppressed, this non-aqueous electrolyte secondary battery has both high capacity and excellent deep discharge cycle life.Type: GrantFiled: August 14, 2006Date of Patent: April 12, 2011Assignee: Panasonic CorporationInventors: Teruaki Yamamoto, Tomohiro Ueda, Shinichi Waki, Youko Sano, Yasuhiko Bito
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Patent number: 7897282Abstract: An AA alkaline battery according to the present invention includes: a positive electrode; a negative electrode; a separator; an alkaline electrolyte; and a negative electrode current collector. The negative electrode contains zinc, indium, and bismuth. The weight of zinc is 4.0 g or more, and the total weight of indium and bismuth is 450 ppm or less with respect to the weight of zinc. The negative electrode current collector contains copper. Tin is provided on at least part of the surface of the negative electrode current collector.Type: GrantFiled: December 15, 2008Date of Patent: March 1, 2011Assignee: Panasonic CorporationInventors: Yasuhiko Bito, Fumio Kato, Harunari Shimamura
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Patent number: 7858232Abstract: A non-aqueous electrolyte secondary battery that has a high electrical capacity and exhibits excellent cycle characteristics even when the battery is rapidly charged and discharged at a large current includes: a positive electrode capable of reversibly absorbing and desorbing Li; a negative electrode; and a non-aqueous electrolyte. The negative electrode includes an alloying material that is capable of electrochemically absorbing and desorbing Li, and includes an A phase composed mainly of Si and a B phase including an intermetallic compound of at least one transition metal element and Si. The transition metal element is selected from the group consisting of Ti, Zr, Ni, Cu, and Fe. At least one of the A phase and the B phase includes a microcrystalline or amorphous region. The weight percent of the A phase relative to the total weight of the A phase and the B phase is greater than 40% and not greater than 95%.Type: GrantFiled: November 9, 2005Date of Patent: December 28, 2010Assignee: Panasonic CorporationInventors: Yasuhiko Bito, Toshitada Sato, Teruaki Yamamoto, Tomohiro Ueda
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Patent number: 7816032Abstract: A negative active material thin film provided on a collector layer directly or via an underlying layer has a multi-layered configuration including at least two silicon thin films containing silicon as a main component. Because of this, even when the thickness of the negative active material thin film is increased, the increase in thickness of one silicon thin film can be prevented by increasing the number of silicon thin films. Thus, the diameter of silicon particles substantially in an inverse truncated cone shape is not enlarged in the silicon thin film. Accordingly, in an energy device having a thin film mainly containing silicon as a negative active material, even when the thickness of the negative active material layer is increased to obtain a larger capacity, cycle characteristics are not degraded.Type: GrantFiled: November 4, 2004Date of Patent: October 19, 2010Assignee: Panasonic CorporationInventors: Kazuyoshi Honda, Kiichiro Oishi, Yasuhiko Bito, Takayuki Nakamoto
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Publication number: 20100216033Abstract: A negative electrode material for non-aqueous electrolyte secondary batteries, characterized in that the negative electrode material comprises a composite particle including solid phases A and B, the solid phase A being dispersed in the solid phase B, and the ratio (IA/IB) of the maximum diffracted X-ray intensity (IA) attributed to the solid phase A to the maximum diffracted X-ray intensity (IB) attributed to the solid phase B satisfies 0.001?IA/IB?0.1, in terms of a diffraction line obtained by a wide-angle X-ray diffraction measurement of the composite particle.Type: ApplicationFiled: May 6, 2010Publication date: August 26, 2010Applicant: Panasonic CorporationInventors: Harunari SHIMAMURA, Toshitada Sato, Takayuki Nakamoto, Yasuhiko Bito, Yoshiaki Nitta
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Publication number: 20100203390Abstract: A non-aqueous electrolyte battery including a negative electrode including metal lithium or a lithium alloy as a negative electrode active material, a positive electrode including a fluorinated graphite as a positive electrode active material, a separator provided between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The concentration ratio [F]/[C] of fluorine atoms to carbon atoms on the surface of the fluorinated graphite is 1.0 or more and less than 1.8. This improves the large-current discharge characteristics particularly in a low temperature environment.Type: ApplicationFiled: September 2, 2008Publication date: August 12, 2010Inventors: Koshi Takamura, Yasuhiko Bito
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Publication number: 20100203382Abstract: An alkaline battery includes: a positive electrode 3 including a positive electrode active material; a negative electrode 6 including a negative electrode active material; a separator 4; and an alkaline electrolyte. The negative electrode active material includes zinc alloy powder containing calcium and bismuth. The zinc alloy powder contains from 10% to 60%, both inclusive, by weight, of calcium with respect to bismuth, from 0.004% to 0.02%, both inclusive, by weight, of bismuth, and at least 11%, by weight, of particles with particle sizes of 75 ?m or less. With this configuration, high-power pulse discharge performance of the alkaline battery can be sufficiently enhanced without problems such as a rapid temperature rise in a short circuit and leakage.Type: ApplicationFiled: July 25, 2008Publication date: August 12, 2010Inventors: Fumio Kato, Harunari Shimamura, Jun Nunome, Yasuhiko Bito
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Publication number: 20100183916Abstract: An alkaline primary battery provided with a positive electrode containing a positive electrode active material and graphite, a negative electrode containing a negative electrode active material, a separator, and an alkaline electrolyte, the positive electrode active material containing manganese dioxide, the alkaline electrolyte containing zinc oxide, and the positive electrode containing metatitanic acid. Due to this, in a battery in which an alkaline electrolyte contains zinc oxide, productions of hetaerolite and the like at the positive electrode and depositions of titanium compound, zinc oxide, and the like on the inner face of a battery case are suppressed, and thus, excellent discharge performance and storage characteristics can be obtained.Type: ApplicationFiled: October 14, 2008Publication date: July 22, 2010Inventors: Harunari Shimamura, Jun Nunome, Fumio Kato, Yasuhiko Bito
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Patent number: 7754383Abstract: A negative electrode material for a non-aqueous electrolyte secondary battery comprising an alloy including silicon and a transition metal selected from the group consisting of titanium, zirconium, vanadium, molybdenum, tungsten, iron, and nickel; and a silicon oxide film and an oxide film of the transition metal formed on a surface of the alloy wherein the alloy includes an A phase including silicon and a B phase including a crystalline alloy of silicon and the transition metal. The negative electrode material has a silicon oxide film and an oxide film of the transition metal on the surface of the alloy wherein the thickness ratio of the transition metal oxide film to the silicon oxide film is at least 0.44 and smaller than 1.Type: GrantFiled: December 12, 2006Date of Patent: July 13, 2010Assignee: Panasonic CorporationInventors: Teruaki Yamamoto, Masaki Hasegawa, Yasuhiko Bito
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Publication number: 20100151321Abstract: An object of the present invention resides in that under the use of an active material capable of attaining a high capacity, the volume expansion of the negative electrode is alleviated, the maintenance of the structure of the negative electrode is achieved, and the degradation of the battery capacity is suppressed. The present invention relates to a negative electrode for a coin-shaped lithium secondary battery, a coin-shaped lithium secondary battery including the negative electrode, and a method for producing the negative electrode for a coin-shaped lithium secondary battery, wherein: the negative electrode includes a molded negative electrode including a negative electrode active material capable of absorbing and desorbing lithium; the molded negative electrode is of a coin shape having two flat faces and a side edge, and has cracks along the thickness direction thereof; at least one of the two flat faces has recessed portions; and the cracks start from the recessed portions.Type: ApplicationFiled: November 9, 2006Publication date: June 17, 2010Inventors: Teruaki Yamamoto, Tomohiro Ueda, Youko Sano, Yasuhiko Bito
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Patent number: 7736806Abstract: A negative electrode material for non-aqueous electrolyte secondary batteries, characterized in that the negative electrode material comprises a composite particle including solid phases A and B, the solid phase A being dispersed in the solid phase B, and the ratio (IA/IB) of the maximum diffracted X-ray intensity (IA) attributed to the solid phase A to the maximum diffracted X-ray intensity (IB) attributed to the solid phase B satisfies 0.001?IA/IB?0.1, in terms of a diffraction line obtained by a wide-angle X-ray diffraction measurement of the composite particle.Type: GrantFiled: March 17, 2003Date of Patent: June 15, 2010Assignee: Panasonic CorporationInventors: Harunari Shimamura, Toshitada Sato, Takayuki Nakamoto, Yasuhiko Bito, Yoshiaki Nitta
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Publication number: 20100143583Abstract: A negative active material thin film containing silicon as a main component is formed on a collector. A composition gradient layer, in which a composition distribution of a main component element of the collector and silicon is varied smoothly, is formed in the vicinity of the interface between the collector and the negative active material thin film. The composition gradient layer contains at least one kind of third element selected from W, Mo, Cr, Co, Fe, Mn, Ni, and P, in addition to the elements contained in the collector and the elements contained in the negative active material thin film. The third element irregularizes the atomic arrangement at the interface between the collector and the negative active material thin film.Type: ApplicationFiled: February 12, 2010Publication date: June 10, 2010Applicant: PANASONIC CORPORATIONInventors: Kazuyoshi Honda, Kiichiro Oishi, Yasuhiko Bito, Takayuki Nakamoto
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Patent number: 7682741Abstract: A composite particle for a lithium rechargeable battery is contained in at least one of a positive electrode and a negative electrode of the lithium rechargeable battery that includes the positive electrode, the negative electrode, a separator, and non-aqueous electrolytic solution. The composite particle contains a conductive agent and an active material that can reversibly store and emit lithium ions. The composite particle is a hollow body formed of an outer wall including the active material and conductive agent, and a cavity capable of retaining non-aqueous electrolytic solution. At least one opening of the cavity that can pass the electrolytic solution is formed in the surface of the composite particle.Type: GrantFiled: May 26, 2006Date of Patent: March 23, 2010Assignee: Panasonic CorporationInventors: Masaki Hasegawa, Yasuhiko Bito
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Patent number: 7662514Abstract: A non-aqueous electrolyte secondary battery including a positive electrode capable of reversibly absorbing and desorbing lithium, a negative electrode including an alloy material as an active material, and a non-aqueous electrolyte, wherein the alloy material includes a phase (phase A) containing at least Si and a phase (phase B) containing an intermetallic compound composed of Si and at least one selected from the group consisting of Ti, Zr, Ni and Cu, and the alloy material contains 0.0006 to 1.0 wt % of Fe in a metallic state.Type: GrantFiled: November 16, 2006Date of Patent: February 16, 2010Assignee: Panasonic CorporationInventors: Yasuhiko Bito, Teruaki Yamamoto