Patents by Inventor Kouhei Tuduki

Kouhei Tuduki 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).

  • Patent number: 11043665
    Abstract: In a nonaqueous electrolyte secondary battery containing a silicon material as a negative electrode active material, the initial charge-discharge efficiency is improved. Negative electrode active material particles (10) according to an embodiment each contain a lithium silicate phase (11) represented by Li2zSiO(2+z) (where 0<z<2) and silicon particles (12) dispersed in the lithium silicate phase (11). In base particles (13) each containing the lithium silicate phase (11) and the silicon particles (12), preferably, a peak originating from SiO2 is not observed at 2?=25° in an XRD pattern obtained by XRD measurement of the particles.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: June 22, 2021
    Assignee: SANYO ELECTRIC CO., LTD.
    Inventors: Hiroshi Minami, Kouhei Tuduki, Atsushi Fukui, Taizou Sunano, Yoshio Kato
  • Patent number: 11024837
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes an electrode body, which is formed by winding a positive electrode and a negative electrode through a separator and then compressing into a flat shape, and a nonaqueous electrolyte. The positive electrode contains a lithium transition metal oxide which contains tungsten oxide adhering to the particle surfaces thereof. The negative electrode contains a negative electrode active material, which has particle surfaces coated with an amorphous carbon film, and at least one of polyacrylic acid and a salt thereof. The pressure acting in the thickness direction of the electrode body is 5×10?2 MPa or more.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: June 1, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Akihiko Takada, Sho Urata, Kouhei Tuduki, Fumiharu Niina, Katsunori Yanagida
  • Patent number: 11005090
    Abstract: This non-aqueous electrolyte secondary battery is provided with: a wound electrode body which comprises a positive electrode, a negative electrode and a separator, and wherein the positive electrode and the negative electrode are wound into a roll, with the separator being interposed therebetween; and a non-aqueous electrolyte. The negative electrode comprises a negative electrode collector and a negative electrode mixture layer that is formed on the negative electrode collector. The negative electrode mixture layer contains graphite, a carbon material that has a BET specific surface area of 10 m2/g or more, said BET specific surface area being larger than that of the graphite, and a hydrophobic binder. The coverage of the particle surfaces of the carbon material by the binder is higher than the coverage of the particle surfaces of the graphite by the binder.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: May 11, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kouhei Tuduki, Takashi Ko, Fumiharu Niina, Katsunori Yanagida
  • Publication number: 20200067074
    Abstract: This non-aqueous electrolyte secondary battery is provided with: a wound electrode body which comprises a positive electrode, a negative electrode and a separator, and wherein the positive electrode and the negative electrode are wound into a roll, with the separator being interposed therebetween; and a non-aqueous electrolyte. The negative electrode comprises a negative electrode collector and a negative electrode mixture layer that is formed on the negative electrode collector. The negative electrode mixture layer contains graphite, a carbon material that has a BET specific surface area of 10 m2/g or more, said BET specific surface area being larger than that of the graphite, and a hydrophobic binder. The coverage of the particle surfaces of the carbon material by the binder is higher than the coverage of the particle surfaces of the graphite by the binder.
    Type: Application
    Filed: December 4, 2017
    Publication date: February 27, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kouhei Tuduki, Takashi Ko, Fumiharu Niina, Katsunori Yanagida
  • Patent number: 10553856
    Abstract: The present invention provides a nonaqueous electrolyte secondary battery capable of suppressing the increase in IV resistance of a battery in a combination of a negative electrode containing a lithium-titanium composite oxide and a carbon material and a positive electrode containing a lithium transition metal oxide. A nonaqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, a separator placed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode contains a lithium transition metal oxide in which Ni accounts for 30 mole percent or more of the total molar amount of metal elements excluding Li and also contains tungsten element. The negative electrode contains a lithium-titanium composite oxide and a carbon material. The nonaqueous electrolyte contains a substance reduced on the negative electrode at a potential of 0.5 V to 1.5 V (vs. Li/Li+).
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: February 4, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Natsumi Goto, Masanori Sugimori, Kouhei Tuduki, Katsunori Yanagida
  • Patent number: 10535877
    Abstract: A non-aqueous electrolyte secondary battery includes a non-aqueous electrolyte and an electrode body in which a positive electrode plate and a negative electrode plate are layered with a separator interposed therebetween. The positive electrode plate contains a phosphate compound. The negative electrode plate contains a graphite-based material, an amorphous/non-crystalline carbon material, and a rubber-based binder. The ratio of the coverage of the rubber-based binder on the amorphous/non-crystalline carbon material to the coverage of the rubber-based binder on the graphite-based material is more than 0 and 0.5 or less.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: January 14, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kouhei Tuduki, Atsushi Fukui, Katsunori Yanagida
  • Publication number: 20190305375
    Abstract: A secondary battery having a suppressed decrease in capacity, even through rapid charging, includes: a positive electrode; a negative electrode including a negative electrode current collector and a negative electrode active material layer formed thereon containing a carbon material and silicon compounds; and an electrolyte solution containing nonaqueous solvents including 10 volume % or more of fluoroethylene carbonate. When: a surface of the negative electrode active material layer that faces the negative electrode current collector and the back side thereof are set as first and second surfaces, respectively; a thickness of the negative electrode active material layer is set as T; and regions from the first and the second surfaces to a depth of 0.5T are set as lower and upper layer portions, respectively, mass M1 of the silicon compounds in the lower layer portion is larger than mass M2 of the silicon compounds in the upper layer portion.
    Type: Application
    Filed: March 21, 2019
    Publication date: October 3, 2019
    Applicants: SANYO Electric Co., Ltd., Panasonic Corporation
    Inventors: Yukitoshi Uehara, Kouhei Tuduki, Yoshikazu Miyachi, Shinya Miyazaki
  • Publication number: 20190181423
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes an electrode body, which is formed by winding a positive electrode and a negative electrode through a separator and then compressing into a flat shape, and a nonaqueous electrolyte. The positive electrode contains a lithium transition metal oxide which contains tungsten oxide adhering to the particle surfaces thereof. The negative electrode contains a negative electrode active material, which has particle surfaces coated with an amorphous carbon film, and at least one of polyacrylic acid and a salt thereof. The pressure acting in the thickness direction of the electrode body is 5×10?2 MPa or more.
    Type: Application
    Filed: July 28, 2017
    Publication date: June 13, 2019
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Akihiko Takada, Sho Urata, Kouhei Tuduki, Fumiharu Niina, Katsunori Yanagida
  • Patent number: 10319986
    Abstract: A positive electrode for nonaqueous electrolyte secondary batteries includes a positive electrode current collector and a positive electrode mix layer, formed on the current collector, containing a positive electrode active material. The positive electrode active material mainly contains a lithium transition metal oxide in which the molar ratio of nickel (Ni) to a transition metal component is 20% or more. The positive electrode mix layer contains a plurality of pores and has a first peak of a logarithmic differential pore volume distribution (dV/dlogD) that appears in the range where the pore diameter D is less than 1 ?m and a second peak of the logarithmic differential pore volume distribution (dV/dlogD) that appears in the range where the pore diameter D is 1 ?m or more in a pore distribution determined by mercury intrusion porosimetry. According to this configuration, a nonaqueous electrolyte secondary battery having excellent output characteristics can be provided.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: June 11, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Kouhei Tuduki, Atsushi Fukui
  • Publication number: 20190173085
    Abstract: A nonaqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, a separator placed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode contains a first lithium transition metal oxide in which Ni accounts for 30 mole percent or more of the total molar amount of metal elements excluding Li; a second lithium transition metal oxide in which Co and Ni account for 60 mole percent or more and 20 mole percent or less, respectively, of the total molar amount of metal elements excluding Li; and tungsten element. The negative electrode contains a lithium-titanium composite oxide.
    Type: Application
    Filed: November 21, 2016
    Publication date: June 6, 2019
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masanori Sugimori, Natsumi Goto, Kouhei Tuduki, Katsunori Yanagida
  • Patent number: 10297826
    Abstract: It is an object of the present invention to provide a nonaqueous electrolyte secondary battery with improved output characteristics. An example of an embodiment of the present invention provides a nonaqueous electrolyte secondary battery comprising an electrode assembly having a structure in which a positive electrode plate and a negative electrode plate are stacked with a separator therebetween. The positive electrode plate contains a lithium transition metal oxide containing tungsten as a positive electrode active material and also contains a phosphate compound. The negative electrode plate contains a graphitic carbon material and an amorphous/noncrystalline carbon material as negative electrode active materials and includes a coating of tungsten or a tungsten compound on the surface of the amorphous/noncrystalline carbon material.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: May 21, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Kouhei Tuduki, Atsushi Fukui
  • Patent number: 10205165
    Abstract: The invention provides a nonaqueous electrolyte secondary battery having a large battery capacity and excellent charge/discharge cycle characteristics. The nonaqueous electrolyte secondary battery includes a negative electrode including a particulate negative electrode active material (33), a positive electrode and a nonaqueous electrolyte. The particulate negative electrode active material (33) includes a plurality of two-phase regions (34) in the particle wherein the two-phase regions include a first phase (A) containing silicon and a second phase (B) containing silicon oxide disposed on the periphery of the first phase, the negative electrode active material being such that the ratio of the intensity at 480 cm?1 wavelength to the intensity at 510 cm?1 wavelength in a Raman spectrum obtained by Raman spectroscopy is not more than 0.1 and the ratio of the intensity at 2?=21.6 to the intensity at 2?=28.4 in an X-ray diffraction pattern obtained by X-ray diffractometry is not more than 0.1.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: February 12, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Kouhei Tuduki, Fukui Atsushi, Taizou Sunano
  • Publication number: 20190044179
    Abstract: In a nonaqueous electrolyte secondary battery, a positive electrode mixture layer of a positive electrode contains a lithium transition metal oxide containing at least nickel (Ni), cobalt (Co), manganese (Mn), and tungsten (W). A negative electrode mixture layer of a negative electrode contains lithium titanate and a group-5 group-6oxide that is an oxide containing at least one selected from a group consisting of group 5 elements and group 6 elements.
    Type: Application
    Filed: January 26, 2017
    Publication date: February 7, 2019
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masanori Sugimori, Kouhei Tuduki, Katsunori Yanagida
  • Publication number: 20180309116
    Abstract: The present invention provides a nonaqueous electrolyte secondary battery capable of suppressing the increase in IV resistance of a battery in a combination of a negative electrode containing a lithium-titanium composite oxide and a carbon material and a positive electrode containing a lithium transition metal oxide. A nonaqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, a separator placed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode contains a lithium transition metal oxide in which Ni accounts for 30 mole percent or more of the total molar amount of metal elements excluding Li and also contains tungsten element. The negative electrode contains a lithium-titanium composite oxide and a carbon material. The nonaqueous electrolyte contains a substance reduced on the negative electrode at a potential of 0.5 V to 1.5 V (vs. Li/Li+).
    Type: Application
    Filed: November 21, 2016
    Publication date: October 25, 2018
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LT D.
    Inventors: Natsumi Goto, Masanori Sugimori, Kouhei Tuduki, Katsunori Yanagida
  • Publication number: 20180183042
    Abstract: A non-aqueous electrolyte secondary battery includes a non-aqueous electrolyte and an electrode body in which a positive electrode plate and a negative electrode plate are layered with a separator interposed therebetween. The positive electrode plate contains a phosphate compound. The negative electrode plate contains a graphite-based material, an amorphous/non-crystalline carbon material, and a rubber-based binder. The ratio of the coverage of the rubber-based binder on the amorphous/non-crystalline carbon material to the coverage of the rubber-based binder on the graphite-based material is more than 0 and 0.5 or less.
    Type: Application
    Filed: September 20, 2016
    Publication date: June 28, 2018
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kouhei Tuduki, Atsushi Fukui, Katsunori Yanagida
  • Publication number: 20180040885
    Abstract: It is an object of the present invention to provide a nonaqueous electrolyte secondary battery with improved output characteristics. An example of an embodiment of the present invention provides a nonaqueous electrolyte secondary battery comprising an electrode assembly having a structure in which a positive electrode plate and a negative electrode plate are stacked with a separator therebetween. The positive electrode plate contains a lithium transition metal oxide containing tungsten as a positive electrode active material and also contains a phosphate compound. The negative electrode plate contains a graphitic carbon material and an amorphous/noncrystalline carbon material as negative electrode active materials and includes a coating of tungsten or a tungsten compound on the surface of the amorphous/noncrystalline carbon material.
    Type: Application
    Filed: February 18, 2016
    Publication date: February 8, 2018
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Kouhei Tuduki, Atsushi Fukui
  • Publication number: 20170324080
    Abstract: A positive electrode for nonaqueous electrolyte secondary batteries includes a positive electrode current collector and a positive electrode mix layer, formed on the current collector, containing a positive electrode active material. The positive electrode active material mainly contains a lithium transition metal oxide in which the molar ratio of nickel (Ni) to a transition metal component is 20% or more. The positive electrode mix layer contains a plurality of pores and has a first peak of a logarithmic differential pore volume distribution (dV/dlogD) that appears in the range where the pore diameter D is less than 1 ?m and a second peak of the logarithmic differential pore volume distribution (dV/dlogD) that appears in the range where the pore diameter D is 1 ?m or more in a pore distribution determined by mercury intrusion porosimetry. According to this configuration, a nonaqueous electrolyte secondary battery having excellent output characteristics can be provided.
    Type: Application
    Filed: November 18, 2015
    Publication date: November 9, 2017
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kouhei Tuduki, Atsushi Fukui
  • Publication number: 20170214041
    Abstract: In a nonaqueous electrolyte secondary battery containing a silicon material as a negative electrode active material, the initial charge-discharge efficiency is improved. Negative electrode active material particles (10) according to an embodiment each contain a lithium silicate phase (11) represented by Li2zSiO(2+z) (where 0<z<2) and silicon particles (12) dispersed in the lithium silicate phase (11). In base particles (13) each containing the lithium silicate phase (11) and the silicon particles (12), preferably, a peak originating from SiO2 is not observed at 2?=25° in an XRD pattern obtained by XRD measurement of the particles.
    Type: Application
    Filed: August 27, 2015
    Publication date: July 27, 2017
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Hiroshi Minami, Kouhei Tuduki, Atsushi Fukui, Taizou Sunano, Yoshio Kato
  • Publication number: 20160336586
    Abstract: Provided is a negative electrode active material, containing at least silicon, for nonaqueous electrolyte secondary batteries. Since the negative electrode active material contains silicon, the negative electrode active material has high capacity and excellent cycle characteristics. A negative electrode active material for nonaqueous electrolyte secondary batteries contains at least silicon. At least, one portion of the surface of each of primary particles containing silicon is covered with an inert phase made of a silicon compound with a silicon oxidation number higher than that of the silicon, a metal-silicon alloy, or metal. The primary particles containing silicon may form secondary particles. The silicon compound with a silicon oxidation number higher than that of silicon is preferably Li2Si2O5, Li2SiO3, or Li4SiO4. Furthermore, the metal-silicon alloy is preferably FeSi and the metal is preferably Ti. Furthermore, the crystallite size of silicon is 500 ? or less.
    Type: Application
    Filed: January 22, 2015
    Publication date: November 17, 2016
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kouhei Tuduki, Ayano Toyoda, Atsushi Fukui, Taizou Sunano
  • Publication number: 20150380735
    Abstract: The invention provides a nonaqueous electrolyte secondary battery having a large battery capacity and excellent charge/discharge cycle characteristics. The nonaqueous electrolyte secondary battery includes a negative electrode including a particulate negative electrode active material (33), a positive electrode and a nonaqueous electrolyte. The particulate negative electrode active material (33) includes a plurality of two-phase regions (34) in the particle wherein the two-phase regions include a first phase (A) containing silicon and a second phase (B) containing silicon oxide disposed on the periphery of the first phase, the negative electrode active material being such that the ratio of the intensity at 480 cm?1 wavelength to the intensity at 510 cm?1 wavelength in a Raman spectrum obtained by Raman spectroscopy is not more than 0.1 and the ratio of the intensity at 2?=21.6 to the intensity at 2?=28.4 in an X-ray diffraction pattern obtained by X-ray diffractometry is not more than 0.1.
    Type: Application
    Filed: March 24, 2014
    Publication date: December 31, 2015
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Kouhei Tuduki, Fukui Atsushi, Taizou Sunano