Patents by Inventor Masao Fukunaga

Masao Fukunaga 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).

  • Publication number: 20090169986
    Abstract: In a non-aqueous secondary battery that includes a strip-shaped positive electrode, a strip-shaped negative electrode, a first insulating layer interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, the width of the positive electrode is smaller than the width of the negative electrode, both longitudinal end faces of the positive electrode are coated with a second insulating layer, and the first insulating layer and the second insulating layer are both porous.
    Type: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Inventors: Masao FUKUNAGA, Hajime NISHINO
  • Publication number: 20080311471
    Abstract: A method for producing a non-aqueous electrolyte secondary battery comprising the steps of: (i) mixing a positive electrode active material, a first binder A and a dispersion medium to prepare a paste A, the active material comprising a lithium-containing transition metal oxide; (ii) mixing a conductive agent, a second binder B and a dispersion medium to prepare a paste B, the conductive agent comprising carbon black; (iii) mixing the paste A and the paste B to prepare a positive electrode material paste C; (iv) applying the positive electrode material paste C onto a positive electrode core member and rolling and drying the resultant member to prepare a positive electrode; and (v) fabricating a battery using the positive electrode, a negative electrode and a non-aqueous electrolyte, wherein contact angle ?A between the non-aqueous electrolyte and the binder A and contact angle ?B between the non-aqueous electrolyte and the binder B satisfy the formula (1): ?B??A?15°.
    Type: Application
    Filed: January 24, 2008
    Publication date: December 18, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Kohei Suzuki, Masao Fukunaga, Toshihide Murata, Kazunori Kubota, Tsumoru Ohata
  • Patent number: 7396612
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: July 8, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20080124628
    Abstract: An object of the present invention is to provide a method for producing a negative electrode for a non-aqueous electrolyte secondary battery capable of forming a negative electrode material mixture layer which is less likely to fall or peel from a negative electrode current collector. One aspect of the present invention pertains to a method for producing a negative electrode for a non-aqueous electrolyte secondary battery, which comprises a paste preparing step of kneading a mixture containing a positive electrode active material for a non-aqueous negative electrode active material, a binder resin having a glass transition temperature within a range from 20 to 40° C. and a dispersion solvent to prepare a negative electrode material mixture paste, a paste applying step of applying the negative electrode material mixture paste controlled to a temperature which is at least 10° C.
    Type: Application
    Filed: November 27, 2007
    Publication date: May 29, 2008
    Inventors: Toshihiro INOUE, Masao Fukunaga, Takafumi Oura
  • Publication number: 20070202404
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: April 26, 2007
    Publication date: August 30, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20070196737
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: April 26, 2007
    Publication date: August 23, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20070196738
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: April 26, 2007
    Publication date: August 23, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Kohei Suzuki, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Patent number: 7150937
    Abstract: A non-aqueous electrolyte battery is provided, which exhibits good high-rate discharge characteristics and low-temperature characteristics and ensures high safety when the negative electrode contains 0.6 to 1.7 parts by weight of a particulate modified styrene-butadiene rubber as a binder and 0.7 to 1.2 parts by weight of a thickening agent so that the total amount of the binder and thickening agent is 1.3 to 2.4 parts by weight per 100 parts by weight of a carbon material as an active material, and the concentration of LiPF6 in the non-aqueous electrolyte is 0.6 to 1.05 mole/liter. The surface area of the active material effectively contributable to charging and discharging reaction is sufficient when the surface area of the carbon material per 1 g of the binder contained in the negative electrode is 300 to 600 m2.
    Type: Grant
    Filed: September 20, 2004
    Date of Patent: December 19, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kohei Suzuki, Kazunori Kubota, Motoi Kawamura, Akira Kuroda, Masao Fukunaga, Tsumoru Ohata
  • Patent number: 7147964
    Abstract: A non-aqueous electrolyte battery is provided, which exhibits good high-rate discharge characteristics and low-temperature characteristics and ensures high safety when the negative electrode contains 0.6 to 1.7 parts by weight of a particulate modified styrene-butadiene rubber as a binder and 0.7 to 1.2 parts by weight of a thickening agent so that the total amount of the binder and thickening agent is 1.3 to 2.4 parts by weight per 100 parts by weight of a carbon material as an active material, and the concentration of LiPF6 in the non-aqueous electrolyte is 0.6 to 1.05 mole/liter. The surface area of the active material effectively contributable to charging and discharging reaction is sufficient when the surface area of the carbon material per 1 g of the binder contained in the negative electrode is 300 to 600 m2.
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: December 12, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kohei Suzuki, Kazunori Kubota, Motoi Kawamura, Akira Kuroda, Masao Fukunaga, Tsumoru Ohata
  • Publication number: 20060234115
    Abstract: An electrode in sheet form includes a current collector and an electrode mixture layer carried on each side thereof. The electrode is bent in the longitudinal direction thereof, to cause a large number of cracks in at least the electrode mixture layer to be positioned on the inner side of the current collector when wound, such that the cracks extend from the surface of the electrode mixture layer to the current collector in the direction intersecting with the longitudinal direction of the electrode. This bending process includes the steps of: bending the electrode at a curvature that is smaller than that of the winding core at least once; and thereafter bending the electrode at a curvature that is equal to or larger than that of the winding core. For example, this process is performed by arranging rollers such that their diameters decrease gradually and pressing the electrode against these rollers. This invention provides an electrode that does not break when wound to form an electrode assembly.
    Type: Application
    Filed: April 6, 2006
    Publication date: October 19, 2006
    Inventors: Kozo Watanabe, Masao Fukunaga, Ichiro Yasuoka, Toshiro Kume
  • Publication number: 20060216608
    Abstract: A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte: the porous film being adhered to a surface of at least one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.
    Type: Application
    Filed: July 26, 2004
    Publication date: September 28, 2006
    Inventors: Tsumoru Ohata, Junji Nakajima, Tetsuya Hayashi, Takashi Takano, Shigeo Ikuta, Suzuki Kohei, Kouji Nishida, Masao Fukunaga, Akiko Fujino
  • Publication number: 20060172196
    Abstract: A manufacturing method of a negative electrode for a non-aqueous electrolyte rechargeable battery has a primary kneading step and a secondary kneading step. In the primary kneading step, conductive material, polymer, and a dispersion medium are mixed and primarily kneaded. The conductive material contains at least fibrous carbon of which aspect ratio is at least 10 and at most 10000. In the secondary kneading step after the primary kneading step, active material capable of storing and emitting a lithium ion and another portion of the dispersion medium are added, and secondary kneading is performed. The active material contains at least silicon.
    Type: Application
    Filed: January 5, 2006
    Publication date: August 3, 2006
    Inventor: Masao Fukunaga
  • Publication number: 20060091012
    Abstract: A capillary array includes a light detection portion, a sample supply portion, a buffer solution supply portion and a voltage application portion which are necessary functions for electrophoresis, thereby, when assembling the capillary array into an electrophoresis apparatus, the same can be immediately used. Accordingly, a capillary array is provided which can be easily incorporated into an electrophoresis apparatus.
    Type: Application
    Filed: December 15, 2005
    Publication date: May 4, 2006
    Inventors: Yasushi Shimizu, Toshiaki Kita, Kiyoshi Tsukada, Akihiro Suzuki, Tomonari Morioka, Masaya Kojima, Ryoji Inaba, Daizo Tokinaga, Shuhei Yamamoto, Yoshiyuki Okishima, Masao Fukunaga, Takayasu Furukawa, Tomohiro Shoji
  • Patent number: 7005052
    Abstract: A capillary array includes a light detection portion, a sample supply portion, a buffer solution supply portion and a voltage application portion which are necessary functions for electrophoresis, thereby, when assembling the capillary array into an electrophoresis apparatus, the same can be immediately used. Accordingly, a capillary array is provided which can be easily incorporated into an electrophoresis apparatus.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: February 28, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Shimizu, Toshiaki Kita, Kiyoshi Tsukada, Akihiro Suzuki, Tomonari Morioka, Masaya Kojima, Ryoji Inaba, Daizo Tokinaga, Shuhei Yamamoto, Yoshiyuki Okishima, Masao Fukunaga, Takayasu Furukawa, Tomohiro Shoji
  • Publication number: 20050271940
    Abstract: A method for manufacturing a positive electrode plate for a non-aqueous secondary battery including: preparing an active material A, a conductive material B, a binder C, a thickener D, and a liquid component E, the thickener D being in a powder state, the conductive material B including a carbon material, the thickener D including a water-soluble polymer, and the liquid component E including water; preparing a slurry including the component E and an electrode material mixture, the material mixture including the active material A, the conductive material B, the binder C, and the thickener D; and applying the slurry on a current collector. In preparing the slurry, the thickener D in a powder state, the active material A and the conductive material B are kneaded together with the liquid component E, and then the primary kneaded matter, the binder C, and an additional liquid component are kneaded.
    Type: Application
    Filed: June 7, 2005
    Publication date: December 8, 2005
    Inventors: Masao Fukunaga, Kohei Suzuki, Katsumi Kashiwagi, Akira Kuroda, Yasuhiro Inadomi, Masanori Sumihara
  • Publication number: 20050198815
    Abstract: A method for producing a non-aqueous electrolyte secondary battery comprising the steps of: (i) mixing a positive electrode active material, a first binder A and a dispersion medium to prepare a paste A, the active material comprising a lithium-containing transition metal oxide; (ii) mixing a conductive agent, a second binder B and a dispersion medium to prepare a paste B, the conductive agent comprising carbon black; (iii) mixing the paste A and the paste B to prepare a positive electrode material paste C; (iv) applying the positive electrode material paste C onto a positive electrode core member and rolling and drying the resultant member to prepare a positive electrode; and (v) fabricating a battery using the positive electrode, a negative electrode and a non-aqueous electrolyte, wherein contact angle ?A between the non-aqueous electrolyte and the binder A and contact angle ?B between the non-aqueous electrolyte and the binder B satisfy the formula (1): ?B??A?15°.
    Type: Application
    Filed: May 9, 2005
    Publication date: September 15, 2005
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kohei Suzuki, Masao Fukunaga, Toshihide Murata, Kazunori Kubota, Tsumoru Ohata
  • Patent number: 6942946
    Abstract: Disclosed is a positive electrode for a non-aqueous electrolyte secondary battery, comprising: a positive electrode mixture layer; and a positive electrode current collector which carries the positive electrode mixture layer, with the positive electrode mixture layer comprising: at least one positive electrode active material; at least one conductive agent; at least one binder; and at least one thickening agent, and the thickening agent comprising a polymer containing at least one acrylonitrile unit and at least one —(CH2)n— structure portion where 6?n.
    Type: Grant
    Filed: July 23, 2002
    Date of Patent: September 13, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masao Fukunaga, Takao Kuromiya, Kazunori Kubota, Kohei Suzuki, Tsumoru Ohata
  • Patent number: 6869724
    Abstract: A non-aqueous electrolyte secondary battery comprises: a positive electrode sheet comprising a positive electrode mixture containing a lithium-containing transition metal oxide as an active material and a particulate binder; a negative electrode sheet comprising a negative electrode mixture containing a carbon material; a separator interposed between the positive electrode sheet and the negative electrode sheet; and a non-aqueous electrolyte containing a lithium salt, wherein the positive electrode sheet and the negative electrode sheet are wound with the separator interposed therebetween to form an electrode assembly, and the positive electrode mixture has an active material density of 3.0 to 4.0 g/ml. The battery has a long life, high energy density and high output.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: March 22, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kohei Suzuki, Kazunori Kubota, Akira Kuroda, Motoi Kawamura, Masao Fukunaga, Tsumoru Ohata
  • Publication number: 20050031955
    Abstract: A non-aqueous electrolyte battery is provided, which exhibits good high-rate discharge characteristics and low-temperature characteristics and ensures high safety when the negative electrode contains 0.6 to 1.7 parts by weight of a particulate modified styrene-butadiene rubber as a binder and 0.7 to 1.2 parts by weight of a thickening agent so that the total amount of the binder and thickening agent is 1.3 to 2.4 parts by weight per 100 parts by weight of a carbon material as an active material, and the concentration of LiPF6 in the non-aqueous electrolyte is 0.6 to 1.05 mole/liter. The surface area of the active material effectively contributable to charging and discharging reaction is sufficient when the surface area of the carbon material per 1 g of the binder contained in the negative electrode is 300 to 600 m2.
    Type: Application
    Filed: September 20, 2004
    Publication date: February 10, 2005
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
    Inventors: Kohei Suzuki, Kazunori Kubota, Motoi Kawamura, Akira Kuroda, Masao Fukunaga, Tsumoru Ohata
  • Publication number: 20040253513
    Abstract: A non-aqueous electrolyte battery is provided, which exhibits good high-rate discharge characteristics and low-temperature characteristics and ensures high safety when the negative electrode contains 0.6 to 1.7 parts by weight of a particulate modified styrene-butadiene rubber as a binder and 0.7 to 1.2 parts by weight of a thickening agent so that the total amount of the binder and thickening agent is 1.3 to 2.4 parts by weight per 100 parts by weight of a carbon material as an active material, and the concentration of LiPF6 in the non-aqueous electrolyte is 0.6 to 1.05 mole/liter. The surface area of the active material effectively contributable to charging and discharging reaction is sufficient when the surface area of the carbon material per 1 g of the binder contained in the negative electrode is 300 to 600 m2.
    Type: Application
    Filed: July 6, 2004
    Publication date: December 16, 2004
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
    Inventors: Kohei Suzuki, Kazunori Kubota, Motoi Kawamura, Akira Kuroda, Masao Fukunaga, Tsumoru Ohata