Patents by Inventor Takaharu Morikawa

Takaharu Morikawa 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: 20220246923
    Abstract: The purpose of the present disclosure is to improve the cycle characteristics of a secondary battery that uses an Si-based active material containing Si. A negative electrode active material (Si-based active material) for secondary batteries according to one embodiment of the present invention comprises core particles, each of which is obtained by dispersing Si particles in a silicon oxide phase or a silicate phase, and a carbon material that adheres to the surfaces of the core particles. If a D/G ratio is the ratio of the peak intensity of the D-band to the peak intensity of the G-band in the Raman spectrum, the carbon material contains a first carbon material that has a D/G ratio of from 0.8 to 2 and a second carbon material that has a D/G ratio of from 0.01 to 0.5. The D/G ratio of the carbon material is from 0.2 to 0.9.
    Type: Application
    Filed: June 24, 2020
    Publication date: August 4, 2022
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Isao Koizumi, Yasunobu Iwami, Takaharu Morikawa
  • Publication number: 20220149377
    Abstract: The purpose of the present disclosure is to provide a slurry for a non-aqueous electrolyte secondary cell capable of obtaining an electrode mixture layer showing excellent adhesion with a current collector. The slurry for a non-aqueous electrolyte secondary cell, which is one mode of the present disclosure, contains: an electrode mixture containing an electrode active material, lithium carbonate, and carboxymethylcellulose or a salt thereof; and water. The lithium carbonate content is in the range of 33 to 300 ppm with respect to the total mass of the electrode mixture.
    Type: Application
    Filed: February 21, 2020
    Publication date: May 12, 2022
    Applicants: Panasonic Corporation, SANYO Electric Co., Ltd.
    Inventors: Yasunobu Iwami, Takaharu Morikawa, Toshiyuki Nakamori, Tomohiro Ichikawa
  • Publication number: 20220037643
    Abstract: The purpose of the present invention is to provide a nonaqueous electrolyte secondary battery which has excellent charge/discharge cycle characteristics. A nonaqueous electrolyte secondary battery negative electrode which is an example of an embodiment of the present invention comprises, as negative electrode active materials, a carbon active material and a Si active material comprising Si particles dispersed in an oxide phase containing at least silicon (Si). The Si active material includes a first Si active material and a second Si active material. The first Si active material has a median size on a volume basis that is greater than that of the second Si active material and has an Si particle content that is higher than that of the second Si active material.
    Type: Application
    Filed: September 10, 2019
    Publication date: February 3, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yasunobu Iwami, Nobumichi Nishida, Takaharu Morikawa, Mai Yokoi, Toshiyuki Nakamori
  • Publication number: 20220037661
    Abstract: The purpose of the present invention is to provide a winding-type nonaqueous electrolyte secondary battery which is capable of minimizing degradation of charge-discharge cycle characteristics.
    Type: Application
    Filed: February 14, 2020
    Publication date: February 3, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Shigeki Moriya, Nobuhiro Sakitani, Takaharu Morikawa
  • Publication number: 20210226199
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes a spirally wound electrode body in which a positive electrode and a negative electrode are spirally wound with a separator interposed therebetween. The negative electrode includes a negative electrode current collector, a first negative electrode mixture layer disposed on a first surface of the negative electrode current collector, and a second negative electrode mixture layer disposed on a second surface of the negative electrode current collector. The first surface and the second surface face outward and inward of the electrode body, respectively. At least the first negative electrode mixture layer includes a Si active material. The content of the Si active material in terms of Si in the second negative electrode mixture layer is lower than the content of the Si active material in terms of Si in the first negative electrode mixture layer.
    Type: Application
    Filed: April 26, 2019
    Publication date: July 22, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takamasa Tamura, Nobuhiro Sakitani, Takaharu Morikawa
  • Publication number: 20210218019
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes a negative electrode including a negative electrode current collector, a first negative electrode mixture layer disposed on a first surface of the negative electrode current collector, and a second negative electrode mixture layer disposed on a second surface of the negative electrode current collector. The first surface and the second surface face outward and inward of the electrode body, respectively. The first negative electrode mixture layer includes a Si active material. The content of the Si active material in terms of Si is lower in a portion of the first negative electrode mixture layer which faces the negative electrode current collector in a thickness direction of the first negative electrode mixture layer, than in a portion of the first negative electrode mixture layer which faces the surface of the first negative electrode mixture layer in the thickness direction.
    Type: Application
    Filed: April 26, 2019
    Publication date: July 15, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takamasa Tamura, Nobuhiro Sakitani, Takaharu Morikawa
  • Publication number: 20210218014
    Abstract: A nonaqueous electrolyte secondary battery according to an aspect of the present disclosure includes: an electrode body in which a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween; and an exterior package which receives the electrode body, the negative electrode plate includes a negative electrode collector, a first negative electrode mixture layer formed on a winding inside first surface of the negative electrode collector, and a second negative electrode mixture layer formed on a winding outside second surface of the negative electrode collector, the first negative electrode mixture layer contains first graphite particles as a primary component, the second negative electrode mixture layer contains second graphite particles as a primary component, and the first graphite particles has an internal void rate lower than an internal void rate of the second graphite particles.
    Type: Application
    Filed: August 1, 2019
    Publication date: July 15, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Nobuhiro Sakitani, Takaharu Morikawa
  • Publication number: 20200263019
    Abstract: A binder for a non-aqueous electrolyte secondary battery electrode that includes a crosslinked polymer having a carboxyl group or a salt thereof, wherein the crosslinked polymer includes 50% by mass or more and 100% by mass or less structural unit derived from an ethylenically unsaturated carboxylic acid monomer relative to all structural units, wherein a total amount of the ethylenically unsaturated carboxylic acid monomer and a salt thereof in terms of a non-neutralized form which is converted from the ethylenically unsaturated carboxylic acid monomer and a salt thereof relative to a total amount of the crosslinked polymer and a salt thereof is 5.0% by mass or less.
    Type: Application
    Filed: March 5, 2018
    Publication date: August 20, 2020
    Applicants: TOAGOSEI CO. LTD., SANYO ELECTRIC CO., LTD.
    Inventors: Takashi HASEGAWA, Naohiko SAITO, Atsushi NISHIWAKI, Hideo MATSUZAKI, Sho URATA, Nobuhiro SAKITANI, Takaharu MORIKAWA
  • Publication number: 20200044254
    Abstract: A water-based binder for a non-aqueous electrolyte secondary battery. A binder for a non-aqueous electrolyte secondary battery electrode, includes a crosslinked polymer having a carboxyl group or a salt thereof, and the crosslinked polymer includes a structural unit derived from an ethylenically unsaturated carboxylic acid monomer; and a structural unit derived from a macromonomer including at least one compositional monomer selected from compounds represented by following formula (1): [C1] H2C?CR1—X??formula (1) wherein in formula (1), R1 represents a hydrogen or a methyl group; X represents C(?O)OR2 or CN; and R2 represents a straight chain or branched C1-C8 alkyl group or a C3-C8 alkyl group having an alicyclic structure.
    Type: Application
    Filed: March 5, 2018
    Publication date: February 6, 2020
    Applicants: TOAGOSEI CO., LTD., SANYO ELECTRIC CO., LTD.
    Inventors: Naohiko SAITO, Takashi HASEGAWA, Atsushi NISHIWAKI, Hideo MATSUZAKI, Nobuhiro SAKITANI, Sho URATA, Takaharu MORIKAWA
  • Patent number: 9413013
    Abstract: Disclosed is a non-aqueous electrolyte secondary battery including a positive electrode including a lithium-containing transition metal composite oxide as a positive electrode active material, a negative electrode including a negative electrode active material, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The positive electrode contains lithium carbonate and lithium hydrogencarbonate in a total amount of 500 ppm or more and 3000 ppm or less, and exhibits a weight loss by temperature increase from 25° C. to 300° C. at 5° C./min of 70% or less of the total amount and of 1500 ppm or less. The non-aqueous electrolyte includes a non-aqueous solvent and a lithium salt. The non-aqueous solvent may contain a cyclic carbonate and a chain carbonate.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: August 9, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takaharu Morikawa, Yasushi Nakagiri, Masaki Deguchi
  • Patent number: 8703314
    Abstract: A prismatic battery includes an electrode assembly including: a positive electrode including a belt-shaped positive electrode core member and a positive electrode active material layer formed on both surfaces thereof; a negative electrode including a belt-shaped negative electrode core member and a negative electrode active material layer formed on both surfaces thereof; and a belt-shaped separator. The electrode assembly is formed by winding the positive electrode, the negative electrode, and the separator in the longitudinal directions thereof. The negative electrode has, in an end portion thereof from which winding is started, a one-sided active material layer portion in which the negative electrode active material layer is provided only on one surface of the negative core member. The one-sided active material layer portion terminates at a predetermined position between positions at which the negative electrode is folded for the second time and for the third time.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: April 22, 2014
    Assignee: Panasonic Corporation
    Inventors: Takaharu Morikawa, Toru Takai
  • Publication number: 20130323566
    Abstract: A thin secondary battery with a power-generating element 10 including positive electrode sheets 12 and negative electrode sheets 14 stacked with separators 5 interposed therebetween, wherein the outermost positive electrode sheet 12 of the power-generating element 10 includes a first resin layer 6a, instead of a positive electrode active material layer 1, on an outer surface of a positive electrode current collector 2, the outermost negative electrode sheet 14 of the power-generating element 10 includes a second resin layer 6b, instead of a negative electrode active material layer 3, on an outer surface of a negative electrode current collector 3, and the first and second resin layers 6a and 6b cover the power-generating element 10, and are bonded to each other at peripheral portions 9 surrounding the power-generating element 10, thereby hermetically sealing the power-generating element 10.
    Type: Application
    Filed: April 11, 2012
    Publication date: December 5, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Takaharu Morikawa, Yasushi Nakagiri, Yukishige Inaba, Atsuo Yoneda, Sanae Chiba, Koshin Hosoki
  • Publication number: 20130288085
    Abstract: Disclosed is a non-aqueous electrolyte secondary battery including a positive electrode including a lithium-containing transition metal composite oxide as a positive electrode active material, a negative electrode including a negative electrode active material, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The positive electrode contains lithium carbonate and lithium hydrogencarbonate in a total amount of 500 ppm or more and 3000 ppm or less, and exhibits a weight loss by temperature increase from 25° C. to 300° C. at 5° C./min of 70% or less of the total amount and of 1500 ppm or less. The non-aqueous electrolyte includes a non-aqueous solvent and a lithium salt. The non-aqueous solvent may contain a cyclic carbonate and a chain carbonate.
    Type: Application
    Filed: October 26, 2011
    Publication date: October 31, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Takaharu Morikawa, Yasushi Nakagiri, Masaki Deguchi
  • Publication number: 20130288093
    Abstract: Provided is a non-aqueous electrolyte secondary battery including: a plurality of electrode groups each formed by winding a positive electrode, a negative electrode, and a separator into a flat shape; a non-aqueous electrolyte; and a prismatic case accommodating the electrode groups and the non-aqueous electrolyte. The case has a rectangular cross-sectional shape. The electrode groups are accommodated in the case such that lateral directions of the cross-sectional shapes of the electrode groups are each perpendicular to the lateral direction of the cross-sectional shape of the case, and the axis directions of the electrode groups are each parallel with the height direction of the case.
    Type: Application
    Filed: November 18, 2011
    Publication date: October 31, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Yasushi Nakagiri, Takaharu Morikawa
  • Patent number: 8367252
    Abstract: A non-aqueous electrolyte secondary battery wherein the non-aqueous electrolyte contains a non-aqueous solvent, a solute dissolved in the non-aqueous solvent, and hydrogenated terphenyl, the solute includes a boron-containing alkali salt and a boron-free alkali salt, the negative electrode includes a negative electrode active material comprising a randomly oriented carbon composite (A), and the carbon composite (A) contains a graphitic carbon substance (B) and a carbon substance (C) that is different from the graphitic carbon substance (B).
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: February 5, 2013
    Assignees: Panasonic Corporation, Mitsubishi Chemical Corporation
    Inventors: Takaharu Morikawa, Atsushi Ueda, Takafumi Oura, Shinichi Kinoshita, Minoru Kotato, Hideharu Satou, Hitoshi Matsumoto
  • Publication number: 20120058373
    Abstract: A prismatic battery 1 includes an electrode assembly 10 including: a positive electrode 12 including a belt-like positive electrode core member 12a and a positive electrode active material layer 12b formed on both surfaces thereof; a negative electrode 14 including a belt-like negative electrode core member 14a and a negative electrode active material layer 14b formed on both surfaces thereof; and a belt-like separator 16. The electrode assembly is formed by winding the positive electrode, the negative electrode, and the separator in the longitudinal directions thereof. The negative electrode has, in an end portion thereof from which winding is started, a one-sided active material layer portion in which the negative electrode active material layer is provided only on one surface of the negative core member. The one-sided active material layer portion terminates at a predetermined position between positions at which the negative electrode is folded for the second time and for the third time.
    Type: Application
    Filed: March 5, 2010
    Publication date: March 8, 2012
    Inventors: Takaharu Morikawa, Toru Takai
  • Publication number: 20100227218
    Abstract: A non-aqueous electrolyte secondary battery wherein the non-aqueous electrolyte contains a non-aqueous solvent, a solute dissolved in the non-aqueous solvent, and hydrogenated terphenyl, the solute includes a boron-containing alkali salt and a boron-free alkali salt, the negative electrode includes a negative electrode active material comprising a randomly oriented carbon composite (A), and the carbon composite (A) contains a graphitic carbon substance (B) and a carbon substance (C) that is different from the graphitic carbon substance (B).
    Type: Application
    Filed: February 23, 2007
    Publication date: September 9, 2010
    Inventors: Takaharu Morikawa, Atsushi Ueda, Takafumi Oura, Shinichi Kinoshita, Minoru Kotato, Hideharu Satou, Hitoshi Matsumoto
  • Publication number: 20090305143
    Abstract: This invention relates to a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode mixture, a negative electrode, a separator, and a non-aqueous electrolyte. The positive electrode mixture includes a positive electrode active material, and the positive electrode active material includes a lithium nickel composite oxide. The non-aqueous electrolyte includes a non-aqueous solvent and a lithium salt dissolved in the non-aqueous solvent. The amount of moisture contained in the positive electrode mixture is greater than 1000 ppm and equal to or less than 6000 ppm. By adjusting the amount of moisture contained in the positive electrode mixture in the above range, it is possible to improve the cycle characteristics of the non-aqueous electrolyte secondary battery including the lithium nickel composite oxide as the positive electrode active material.
    Type: Application
    Filed: May 9, 2007
    Publication date: December 10, 2009
    Inventors: Hiroshi Matsuno, Takaharu Morikawa, Akihiro Maeda, Takeshi Yao
  • Publication number: 20070254215
    Abstract: Disclosed is a non-aqueous electrolyte containing a non-aqueous solvent, a solute dissolved in the non-aqueous solvent, and a hydrogenated terphenyl. The solute comprises an alkali salt containing boron and an alkali salt containing no boron. An amount of the hydrogenated terphenyl contained in the non-aqueous electrolyte is preferably 0.5 mass % to 3.5 mass %. For example, LiBF4, NaBF4 or KBF4 is used as the alkali salt containing boron, while LiPF6, LiClO4, LiAsF6, LiCF3SO3, LiN(SO2CF3)2, LiN(SO2C2F5)2 or LiC(SO2CF3)3 is used as the alkali salt containing no boron.
    Type: Application
    Filed: August 29, 2005
    Publication date: November 1, 2007
    Inventors: Takaharu Morikawa, Takafumi Oura, Atsushi Otsuka, Shinichi Kinoshita, Minoru Kotato
  • Patent number: 7026073
    Abstract: In an electrolyte of a non-aqueous electrolyte secondary battery using a cyclic carboxylic-acid ester exerting high conductivity under a low temperature condition, for suppressing reductive decomposition of the cyclic carboxylic acid ester, a cyclic carbonic acid ester having at least one carbon-carbon unsaturated bond is contained, and for suppressing excessive polymerization reaction of the cyclic carbonic acid ester having at least one carbon-carbon unsaturated bond, a cyclic carbonic acid ester having no carbon-carbon unsaturated bond is further contained.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: April 11, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Atsushi Ueda, Kazuya Iwamoto, Takafumi Oura, Hiroshi Yoshizawa, Masaki Deguchi, Takaharu Morikawa