Patents by Inventor Akihiro Modeki
Akihiro Modeki 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: 10938009Abstract: A first separator (130) covers a first surface of a cathode electrode (110). The first separator (130) has a melting point of a first temperature. A second separator (140) covers a second surface of the cathode electrode (110). The second separator (140) has a melting point of a second temperature higher than the first temperature. An adhesive layer (132) is formed by melting a portion of the first separator (130). The adhesive layer (132) pastes the first separator (130) and the second separator (140) to each other.Type: GrantFiled: May 28, 2015Date of Patent: March 2, 2021Assignee: Envision AESC Energy Devices Ltd.Inventor: Akihiro Modeki
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Patent number: 10637026Abstract: Provided is a separator for a lithium ion secondary battery includes a porous resin layer that contains polyolefin as a main component. In a spectrum obtained by X-ray diffraction using a CuK?-ray as a ray source, the separator has a diffraction peak (A) corresponding to a (111) crystal plane of the polyolefin.Type: GrantFiled: February 3, 2016Date of Patent: April 28, 2020Assignee: Envision AESC Energy Devices, Ltd.Inventor: Akihiro Modeki
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Publication number: 20200044280Abstract: A lithium ion secondary battery includes: a power generating element including an electrolyte solution, and an electrode stack including a positive electrode including a positive electrode active material layer and a positive electrode current collector foil and a negative electrode including a negative electrode active material layer and a negative electrode current collector foil, the positive electrode and the negative electrode being stacked with a separator interposed therebetween; and a package that internally seals this power generating element. The negative electrode current collector foil is a copper foil, and the negative electrode has a tensile strength of 17.6 N/mm2 or more and 20.0 N/mm2 or less.Type: ApplicationFiled: August 1, 2019Publication date: February 6, 2020Applicant: Envision AESC Japan Ltd.Inventors: Akihiro Modeki, Yuji Tanjo
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Patent number: 10439249Abstract: Provided is a lithium ion secondary battery including, as components accommodated in a container, a positive electrode that intercalates and deintercalates lithium, a negative electrode that intercalates and deintercalates lithium, a nonaqueous electrolytic solution that contains a lithium salt, and a separator that is interposed between the positive electrode and the negative electrode. The separator includes a porous resin layer containing polyolefin as a main component.Type: GrantFiled: February 3, 2016Date of Patent: October 8, 2019Assignee: Envision AESC Energy Devices Ltd.Inventor: Akihiro Modeki
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Patent number: 10290839Abstract: Secondary battery 100 comprises: battery electrode assembly (electrode laminate) 4 that includes positive electrodes 1 and negative electrodes 2 that overlap each other with separator 3 interposed therebetween; and conductive adhesive tape 5 which has a multilayer structure including adhesive layer 5a and conductive layer 5b, wherein adhesive layer 5a has conductivity and adhesiveness and adheres to a surface of battery electrode assembly 4, conductive layer 5b is laminated on adhesive layer 5a, and conductive adhesive tape 5 has electric resistance of 1.0 ?/cm2 or less in a thickness direction and covers at least a part of an outer peripheral portion of battery electrode assembly 4 by being wound around said part.Type: GrantFiled: March 10, 2015Date of Patent: May 14, 2019Assignee: NEC ENERGY DEVICES, LTD.Inventor: Akihiro Modeki
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Publication number: 20180097256Abstract: Provided is a lithium ion secondary battery including, as components accommodated in a container, a positive electrode that intercalates and deintercalates lithium, a negative electrode that intercalates and deintercalates lithium, a nonaqueous electrolytic solution that contains a lithium salt, and a separator that is interposed between the positive electrode and the negative electrode. The separator includes a porous resin layer containing polyolefin as a main component.Type: ApplicationFiled: February 3, 2016Publication date: April 5, 2018Applicant: NEC ENERGY DEVICES, LTD.Inventor: Akihiro MODEKI
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Publication number: 20180053925Abstract: Provided is a separator for a lithium ion secondary battery includes a porous resin layer that contains polyolefin as a main component. In a spectrum obtained by X-ray diffraction using a CuK?-ray as a ray source, the separator has a diffraction peak (A) corresponding to a (111) crystal plane of the polyolefin.Type: ApplicationFiled: February 3, 2016Publication date: February 22, 2018Applicant: NEC ENERGY DEVICES, LTD.Inventor: Akihiro MODEKI
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Patent number: 9871238Abstract: To provide a secondary battery that can be prevented from exploding or catching fire due to the occurrence of a short circuit. The secondary battery (10) of the present invention includes an electric cell assembly that is, at least, partially enclosed by an extensible sheet (11) having a surface resistivity of 10?2 ?/sq to 1010 ?/sq, and is housed together with an electrolyte in a container (5), and in which positive electrodes (1) and negative electrodes (2) are stacked on each other or wound with a separator (3) interposed therebetween.Type: GrantFiled: August 27, 2014Date of Patent: January 16, 2018Assignee: NEC ENERGY DEVICES, LTD.Inventor: Akihiro Modeki
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Publication number: 20170331091Abstract: A first separator (130) covers a first surface of a cathode electrode (110). The first separator (130) has a melting point of a first temperature. A second separator (140) covers a second surface of the cathode electrode (110). The second separator (140) has a melting point of a second temperature higher than the first temperature. An adhesive layer (132) is formed by melting a portion of the first separator (130). The adhesive layer (132) pastes the first separator (130) and the second separator (140) to each other.Type: ApplicationFiled: May 28, 2015Publication date: November 16, 2017Applicant: NEC ENERGY DEVICES, LTD.Inventor: Akihiro MODEKI
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Publication number: 20170040576Abstract: Secondary battery 100 comprises: battery electrode assembly (electrode laminate) 4 that includes positive electrodes 1 and negative electrodes 2 that overlap each other with separator 3 interposed therebetween; and conductive adhesive tape 5 which has a multilayer structure including adhesive layer 5a and conductive layer 5b, wherein adhesive layer 5a has conductivity and adhesiveness and adheres to a surface of battery electrode assembly 4, conductive layer 5b is laminated on adhesive layer 5a, and conductive adhesive tape 5 has electric resistance of 1.0 /cm2 or less in a thickness direction and covers at least a part of an outer peripheral portion of battery electrode assembly 4 by being wound around said part.Type: ApplicationFiled: March 10, 2015Publication date: February 9, 2017Applicant: NEC ENERGY DEVICES, LTD.Inventor: Akihiro MODEKI
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Patent number: 9466829Abstract: Provided is a lithium-manganese-type solid solution positive electrode material capable of effectively suppressing gas generation in an initial cycle. Proposed is a lithium-manganese-type solid solution positive electrode material that includes a monoclinic structure of C2/m in a hexagonal structure of a space group R-3m. The lithium-manganese-type solid solution positive electrode material contains a solid solution expressed by a composition formula: xLi4/3Mn2/3O2+(1?x)LiMn?Co?Ni?O2 (in the formula, 0.2???0.6, 0???0.4, and 0.2???0.6). In the composition formula, x is equal to or more than 0.36 and less than 0.50.Type: GrantFiled: August 14, 2013Date of Patent: October 11, 2016Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Akihiro Modeki, Yanko Marinov Todorov, Shinya Kagei
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Publication number: 20160233472Abstract: To provide a secondary battery that can be prevented from exploding or catching fire due to the occurrence of a short circuit. The secondary battery (10) of the present invention includes an electric cell assembly that is, at least, partially enclosed by an extensible sheet (11) having a surface resistivity of 10?2 ?/sq to 1010 ?/sq, and is housed together with an electrolyte in a container (5), and in which positive electrodes (1) and negative electrodes (2) are stacked on each other or wound with a separator (3) interposed therebetween.Type: ApplicationFiled: August 27, 2014Publication date: August 11, 2016Applicant: NEC ENERGY DEVICES, LTD.Inventor: Akihiro MODEKI
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Publication number: 20130327979Abstract: Provided is a lithium-manganese-type solid solution positive electrode material capable of effectively suppressing gas generation in an initial cycle. Proposed is a lithium-manganese-type solid solution positive electrode material that includes a monoclinic structure of C2/m in a hexagonal structure of a space group R-3m. The lithium-manganese-type solid solution positive electrode material contains a solid solution expressed by a composition formula: xLi4/3Mn2/3O2+(1?x)LiMn?Co?Ni?O2 (in the formula, 0.2???0.6, 0???0.4, and 0.2???0.6). In the composition formula, x is equal to or more than 0.36 and less than 0.50.Type: ApplicationFiled: August 14, 2013Publication date: December 12, 2013Applicant: Mitsui Mining & Smelting Co., Ltd.Inventors: Akihiro Modeki, Yanko Marinov Todorov, Shinya Kagei
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Patent number: 8491822Abstract: A tin oxide particle having at least two diffraction peaks at 2? (deg) of 9±1° and 28±1° in XRD measurement by Cu/K? radiation. The tin oxide particle preferably shows diffraction peaks at 2? (deg) of 19±1°, 48±1°, and 59±1°. The tin oxide particle preferably has electroconductivity. The tin oxide particle is preferably produced by mixing an aqueous solution containing tin (II) and a hydroxyl-containing organic compound in a heated condition with an alkali.Type: GrantFiled: July 20, 2010Date of Patent: July 23, 2013Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Kazuhiko Kato, Akihiro Modeki, Kenji Suzuoka, Yasunori Tabira, Isamu Yashima
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Patent number: 8197966Abstract: A negative electrode 10 for a nonaqueous secondary battery has an active material layer 12 containing active material particles 12a. The particles 12a are coated at least partially with a metallic material 13 having low capability of lithium compound formation. The active material layer 12 has voids located between the metallic material-coated particles 12a with a void fraction of 15% to 45%. The metallic material 13 on the surface of the particles is preferably present throughout the thickness of the active material layer. The active material particles 12a are preferably of a silicon-based material. The active material layer 12 preferably contains 1% to 3% by weight of an electroconductive carbon material based on the weight of the active material particles 12a.Type: GrantFiled: April 18, 2007Date of Patent: June 12, 2012Assignee: Mitsui Mining & Smelting Co., LtdInventors: Akihiro Modeki, Tomoyoshi Matsushima, Masahiro Hyakutake, Kiyotaka Yasuda, Kayoko Shinzawa, Yoshiki Sakaguchi
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Publication number: 20120085979Abstract: A tin oxide particle having at least two diffraction peaks at 2? (deg) of 9±1° and 28±1° in XRD measurement by Cu/K? radiation. The tin oxide particle preferably shows diffraction peaks at 2? (deg) of 19±1°, 48±1°, and 59±1°. The tin oxide particle preferably has electroconductivity. The tin oxide particle is preferably produced by mixing an aqueous solution containing tin (II) and a hydroxyl-containing organic compound in a heated condition with an alkali.Type: ApplicationFiled: July 20, 2010Publication date: April 12, 2012Applicant: MITSUI MINING & SMELTING CO., LTD.Inventors: Kazuhiko Kato, Akihiro Modeki, Kenji Suzuoka, Yasunori Tabira, Isamu Yashima
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Patent number: 7811709Abstract: A negative electrode for a non-aqueous electrolyte secondary cell includes a current collector an, formed on a surface or both surfaces thereof, an active material structure containing an electroconductive material with a low capability of forming a compound with lithium, and the active material structure includes 5% to 80% by weight of active material particles containing a material having a high capability for forming a compound with lithium. The active material structure can include an active material layer containing the active material particles and a surface-covering layer on the active material layer.Type: GrantFiled: November 25, 2003Date of Patent: October 12, 2010Assignee: Mitsui Mining & Smelting Co., Ltd.Inventors: Shinichi Musha, Hitohiko Honda, Yoshiki Sakaguschi, Kiyotaka Yasuda, Akihiro Modeki, Tomoyoshi Matsushima, Takeo Taguchi, Kazuko Taniguchi, Makoto Dobashi
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Publication number: 20100233543Abstract: A nonaqueous secondary battery comprising a positive electrode which has a positive electrode active material layer containing Li(LixMn2xCo1-3x)O2 wherein x represents 0<x<?, and a negative electrode which has a negative electrode active material layer containing Si or Sn. The amounts of the active materials are preferably such that the ratio of the theoretical capacity of the negative electrode to the capacity of the positive electrode at a cut-off voltage in a first and subsequent charging operations is 1.1 to 3.0. The battery preferably has lithium corresponding to 9% to 50% of the theoretical capacity of the negative electrode accumulated in the negative electrode.Type: ApplicationFiled: September 28, 2007Publication date: September 16, 2010Inventors: Koichi Numata, Takashi Okamoto, Hitohiko Ide, Yasunori Tabira, Akihiro Modeki
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Publication number: 20100136437Abstract: A nonaqueous secondary battery having a negative electrode containing a silicon active material and a nonaqueous solvent containing a fluorine-containing solvent. The active material layer has a fluorine content of 5 to 30 wt % based on the silicon content after at least 100 charge/discharge cycles at a rate of 50% or more of the battery's capacity. The battery is suitably produced by a method including applying a slurry containing silicon active material particles to a current collector, electroplating the resulting coating layer using a plating bath at a pH higher than 7 to coat at least part of the surface of the particles with copper, acid washing the coating layer to make a negative electrode, assembling the negative electrode together with a positive electrode, a separator, and a nonaqueous electrolyte containing a fluorine-containing solvent into a nonaqueous secondary battery, and subjecting the battery to a first charge operation at a low rate of 0.005 to 0.03 C.Type: ApplicationFiled: October 11, 2007Publication date: June 3, 2010Applicant: MITSUI MINING & SMELTING CO., LTD.Inventors: Takuma Nishida, Akihiro Modeki, Yoshiki Sakaguchi
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Publication number: 20090202915Abstract: A negative electrode (10) for use in a non-aqueous electrolyte secondary battery comprises an active material layer (12) containing a particle (12a) of an active material. At least a part of the surface of the particle (12a) is coated with a metal material (13) having a poor ability of forming a lithium compound. A void is formed between the particles (12a) that are coated with the metal material (13). The active material layer has a void ratio of 15 to 45%. Preferably, the metal material (13) is present over the entire area of such a part of the surface of the particle that extends in the thickness-wise direction of the active material layer. Also preferably, the particle (12a) of the active material is composed of a silicone material, and the active material layer (12) contains a conductive carbon material in an amount of 1 to 3% by weight relative to the weight amount of the particle (12a) of the active material.Type: ApplicationFiled: April 18, 2007Publication date: August 13, 2009Inventors: Akihiro Modeki, Tomoyoshi Matsushima, Masahiro Hyakutake, Kiyotaka Yasuda, Kayoko Shinzawa, Yoshiki Sakaguchi