Patents by Inventor Hideki Nakai
Hideki Nakai 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: 7674552Abstract: A battery capable of improving battery characteristics such as cycle characteristics is provided. A coating containing lithium fluoride and lithium hydroxide is provided on the surface of an anode active material layer. The ratio between lithium fluoride and lithium hydroxide is in the range, in which the Li2F+/Li2OH+ peak intensity ratio obtained in positive ion analysis by a Time of Flight-Secondary Ion Mass Spectrometry is 1 or more. The anode active material layer contains a substance containing Si or Sn as an element as an anode active material. By the coating, oxidation of the anode active material layer is inhibited, and decomposition reaction of the electrolytic solution is inhibited.Type: GrantFiled: December 21, 2005Date of Patent: March 9, 2010Assignee: Sony CorporationInventors: Hideki Nakai, Akinori Kita, Tadahiko Kubota, Atsumichi Kawashima
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Publication number: 20100055567Abstract: A positive electrode active material includes: a particle containing a positive electrode material capable of intercalating and deintercalating an electrode reactant; and a film provided in at least a part of the particle and having a peak of C2H5S+, C3H7S+ or C4H9S+ obtained by cation analysis by time of flight secondary ion mass spectrometry.Type: ApplicationFiled: September 1, 2009Publication date: March 4, 2010Applicant: SONY CORPORATIONInventors: Hideki Nakai, Toru Odani
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Publication number: 20100028768Abstract: A positive electrode active material includes: a complex oxide particle containing at least lithium and one or plural transition metals; and a coating layer provided in at least a part of the complex oxide particle, wherein the coating layer contains at least one element M which is different from the principal transition metal constituting the complex oxide particle and which is selected among elements belonging to the Groups 2 to 13, and at least one element X selected among phosphorus (P), silicon (Si) and germanium (Ge), and the element M and the element X show different distribution from each other in the coating layer.Type: ApplicationFiled: July 22, 2009Publication date: February 4, 2010Applicant: SONY CORPORATIONInventors: Koji Morita, Satoshi Fujiki, Hideki Nakai
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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: 20090148771Abstract: A nonaqueous electrolyte battery includes a cathode having a cathode active material layer including a lithium phosphate compound having an olivine structure; an anode having an anode active material; and a nonaqueous electrolyte, wherein the cathode active material layer includes a carbon material, of which a ratio of a peak intensity at 1,360 cm?1 to a peak intensity at 1,580 cm?1, obtained by Raman spectrum analysis through measurement using argon laser radiation at a wavelength of 514.52 nm, is 0.25 or more and 0.8 or less; and fibrous carbon.Type: ApplicationFiled: February 10, 2009Publication date: June 11, 2009Applicant: SONY CORPORATIONInventors: Takehiko Ishii, Mikio Watanabe, Hideki Nakai
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Publication number: 20090136855Abstract: A battery capable of improving the cycle characteristics and the swollenness characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The electrolytic solution is impregnated in a separator provided between the cathode and the anode. The anode has a coat on an anode active material layer provided on an anode current collector. The coat contains a metal salt. The metal salt has a hydroxyl group and at least one of a sulfonic acid group and a carboxylic acid group. Thereby, lithium ions are easily inserted in the anode and extracted from the anode, and decomposition of the electrolytic solution is prevented.Type: ApplicationFiled: November 20, 2008Publication date: May 28, 2009Applicant: SONY CORPORATIONInventors: Hiroyuki Yamaguchi, Masayuki Ihara, Hideki Nakai, Atsumichi Kawashima, Tadahiko Kubota
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Publication number: 20090111019Abstract: A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The electrolytic solution is impregnated in a separator provided between the cathode and the anode. The anode has a coat on an anode active material layer provided on an anode current collector. The coat contains a fluorine resin. A terminal of the fluorine resin is a hydroxyl group or the like capable of being fixed (for example, being absorbed or bound) on the surface of the anode active material layer (anode active material).Type: ApplicationFiled: October 31, 2008Publication date: April 30, 2009Applicant: SONY CORPORATIONInventors: Takakazu Hirose, Hideki Nakai, Kenichi Kawase, Hiroyuki Yamaguchi, Tadahiko Kubota
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Publication number: 20090111020Abstract: An anode and a secondary battery capable of improving the charge and discharge efficiency are provided. The anode includes an anode current collector, and an anode active material layer provided on the anode current collector. The anode active material layer has a plurality of anode active material particles containing at least one of a simple substance of silicon, a compound of silicon, a simple substance of tin and a compound of tin, and has a coat containing an oxo acid salt in at least part of the surface of the anode active material particles.Type: ApplicationFiled: October 21, 2008Publication date: April 30, 2009Applicant: Sony CorporationInventors: Hiroyuki Yamaguchi, Hideki Nakai, Masayuki Ihara, Tadahiko Kubota, Shigeru Fujita
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Publication number: 20090098458Abstract: A battery capable of obtaining superior cycle characteristics and safety is provided. The battery includes a cathode, an anode, and an electrolytic solution. The electrolytic solution is impregnated in a separator provided between the cathode and the anode. The anode has an insulative coat on an anode active material layer provided on an anode current collector. The coat contains an insulating material such as a meal hydroxide and a metal oxide. The coat is in a form of plate divided into a plurality of portions. The insulation property of the coat prevents internal short circuit. A plurality of portions of the coat prevent separation of the anode active material layer and decomposition of the electrolytic solution. Further, even when short circuit occurs, heat generation is prevented by heat absorption characteristics of the coat.Type: ApplicationFiled: October 8, 2008Publication date: April 16, 2009Applicant: SONY CORPORATIONInventors: Takayuki Fujii, Kenichi Kawase, Hideki Nakai, Rikako Imoto, Kensuke Yamamoto
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Publication number: 20090092892Abstract: An anode capable of improving charge-discharge efficiency, and a method of manufacturing the anode, and a battery using the anode are provided. An anode 22 has a configuration in which an anode active material layer 22B is arranged on an anode current collector 22A. The anode active material layer 22B includes anode active material particles made of an anode active material including at least one of silicon and tin as an element. An oxide-containing film including an oxide of at least one kind selected from the group consisting of silicon, germanium and tin is formed in a region in contact with an electrolytic solution of the surface of each anode active material particle by a liquid-phase method such as a liquid-phase deposition method. The region in contact with the electrolytic solution of the surface of each anode active material particle is covered with the oxide-containing film, thereby the chemical stability of the anode 22 is improved, and charge-discharge efficiency is improved.Type: ApplicationFiled: May 22, 2007Publication date: April 9, 2009Applicant: SONY CORPORATIONInventors: Hiroyuki Yamaguchi, Hiroshi Horiuchi, Kenichi Kawase, Tadahiko Kubota, Hideki Nakai, Takakazu Hirose
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Publication number: 20090029252Abstract: A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode and an electrolytic solution. The anode has a coat on an anode active material layer provided on an anode current collector. The anode active material layer contains an anode material that is capable of inserting and extracting an electrode reactant and has at least one of a metal element and a metalloid element. The coat contains a metal salt having sulfur and oxygen.Type: ApplicationFiled: June 24, 2008Publication date: January 29, 2009Applicant: SONY CORPORATIONInventors: Hideki Nakai, Masayuki Ihara, Hiroyuki Yamaguchi
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Publication number: 20090004568Abstract: A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode and an electrolytic solution. The anode has an anode current collector, an anode active material layer provided on the anode current collector, and a coat provided on the anode active material layer, in which the coat contains a fluorine resin having an ether bond.Type: ApplicationFiled: May 27, 2008Publication date: January 1, 2009Applicant: SONY CORPORATIONInventors: Takakazu Hirose, Hideki Nakai, Momoe Adachi, Hiroyuki Yamaguchi, Kenichi Kawase, Tadahiko Kubota
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Publication number: 20080311472Abstract: A battery capable of improving cycle characteristics is provided. An anode includes: an anode current collector; an anode active material arranged on the anode current collector; and a coating arranged on the anode active material layer, in which the coating includes at least one of a metal salt represented by Chemical Formula 1 and a metal salt of oxocarbonic acid.Type: ApplicationFiled: June 9, 2008Publication date: December 18, 2008Applicant: SONY CORPORATIONInventors: Hiroyuki Yamaguchi, Masayuki Ihara, Hideki Nakai, Toru Odani, Tadahiko Kubota
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Publication number: 20080254368Abstract: A cathode active material has: a lithium composite oxide which contains the highest proportion of nickel among constituent metal elements except lithium; and a phosphorus compound which is contained near the surface of the lithium composite oxide, a cathode including the cathode active material, and a method for manufacturing the cathode.Type: ApplicationFiled: March 31, 2008Publication date: October 16, 2008Applicant: SONY CORPORATIONInventors: Tomoyo Ooyama, Yukifumi Takeda, Masanori Soma, Hideki Nakai
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Publication number: 20080233478Abstract: A battery capable of improving the cycle characteristics and the swollenness characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The node has an anode current collector and an anode active material layer provided thereon, and the anode active material layer contains a plurality of anode active material particles having silicon, and a metal material having a metal element not being alloyed with an electrode reactant in a gap between the anode active material particles.Type: ApplicationFiled: January 24, 2008Publication date: September 25, 2008Applicant: SONY CORPORATIONInventors: Takakazu Hirose, Kenichi Kawase, Hideki Nakai, Rikako Imoto, Nozomu Morita
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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: 20080032194Abstract: A positive electrode having a positive-electrode active material and used for a nonaqueous electrolyte cell is provided. The positive electrode includes a coating, wherein the coating contains at least one first compound for which a binding-energy peak in a phosphorus 2p spectrum obtained by X-ray photoelectron spectroscopy is in the range of 132 to 135 eV.Type: ApplicationFiled: July 23, 2007Publication date: February 7, 2008Applicant: SONY CORPORATIONInventors: Hideki Nakai, Atsumichi Kawashima, Akinori Kita
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Publication number: 20070292764Abstract: A secondary battery having a cathode, an anode, and an electrolyte is provided. The cathode includes a cathode active material containing at least one kind selected from the group consisting of sulfur S and phosphorus P in a portion near the particle surface of a lithium composite oxide. A content of the kind in the portion is larger than that in the particle of the lithium composite oxide.Type: ApplicationFiled: June 14, 2007Publication date: December 20, 2007Applicant: SONY CORPORATIONInventors: Masanori Soma, Atsumichi Kawashima, Masayuki Ihara, Hideki Nakai, Kenichi Kawase
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Publication number: 20070117024Abstract: A battery capable of reducing swelling is provided. A battery includes a cathode, an anode and an electrolyte. The anode includes a coating containing a S03-containing compound, and the electrolyte contains an electrolyte salt having reduction power. Therefore, on the surface of the anode, the SO3-containing compound is preferentially reduced and decomposed to become a sulfur-containing compound. In the result, decomposition reaction of the electrolyte is prevented.Type: ApplicationFiled: November 20, 2006Publication date: May 24, 2007Applicant: Sony CorporationInventors: Hideki Nakai, Atsumichi Kawashima, Akinori Kita
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Publication number: 20060134524Abstract: A battery capable of improving battery characteristics such as cycle characteristics is provided. A coating containing lithium fluoride and lithium hydroxide is provided on the surface of an anode active material layer. The ratio between lithium fluoride and lithium hydroxide is in the range, in which the Li2F+/Li2OH+ peak intensity ratio obtained in positive ion analysis by a Time of Flight-Secondary Ion Mass Spectrometry is 1 or more. The anode active material layer contains a substance containing Si or Sn as an element as an anode active material. By the coating, oxidation of the anode active material layer is inhibited, and decomposition reaction of the electrolytic solution is inhibited.Type: ApplicationFiled: December 21, 2005Publication date: June 22, 2006Inventors: Hideki Nakai, Akinori Kita, Tadahiko Kubota, Atsumichi Kawashima