Patents by Inventor Akihiko Miyazaki
Akihiko Miyazaki 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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Publication number: 20230361360Abstract: Provided is an electrode for an electrochemical device that can sufficiently inhibit heat generation in the event of an internal short circuit and reduce IV resistance in an electrochemical device. The electrode includes a current collector and an electrode mixed material layer. The electrode mixed material layer contains an electrode active material, a binder, and a foaming agent having a thermal decomposition temperature of 150° C. to 400° C. In a thickness direction cross-section of the electrode mixed material layer, thermally decomposable sites formed of the foaming agent and having a circumscribed circle diameter of 1.0 ?m to 10.0 ?m are present, and a number A of the thermally decomposable sites per 50 ?m2 in a surface region of the electrode mixed material layer is larger than a number B of the thermally decomposable sites per 50 ?m2 in a deep region of the electrode mixed material layer.Type: ApplicationFiled: October 15, 2021Publication date: November 9, 2023Applicant: ZEON CORPORATIONInventors: Akihiko MIYAZAKI, Shiho MOSAKI
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Publication number: 20230239379Abstract: A data acquisition device includes a valid data acquirer configured to acquire valid data from communication data based on an analysis parameter including an offset from a head of the communication data to the valid data and a data length of the valid data and output the acquired valid data.Type: ApplicationFiled: January 19, 2023Publication date: July 27, 2023Applicant: NTT Advanced Technology CorporationInventors: Yuta UKON, Masaru KATAYAMA, Akihiko MIYAZAKI
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Publication number: 20230104348Abstract: An aspect of the present invention is an energy storage device including: a negative electrode including a pair of flat portions facing each other and a curved folding portion connecting end portions on one side of the pair of flat portions to each other; and a sheet-like positive electrode disposed between the pair of flat portions of the negative electrode, in which the negative electrode includes a negative electrode substrate and a negative active material layer stacked on a surface of the negative electrode substrate directly or indirectly in a non-pressed or low-pressure pressed state, the negative active material layer contains a negative active material, the negative active material contains solid graphite particles, and the solid graphite particle has an aspect ratio of 1 or more and 5 or less.Type: ApplicationFiled: March 8, 2021Publication date: April 6, 2023Inventors: Kenta OGI, Takayuki KOYAMA, Shota ITO, Akihiko MIYAZAKI
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Patent number: 11621417Abstract: The present embodiment provides a lithium ion secondary battery including a positive electrode containing LiaNixCoyMzO2 (0.9?a?1.2, 0.3?x?0.8, 0.2?y+z?0.7, where M is a metal element other than Li, Ni, and Co) as a positive active material, and a negative electrode containing non-graphitic carbon as a negative active material. In this lithium ion secondary battery, at a portion where the positive electrode and the negative electrode face each other, a basis weight (P) of the positive active material and a basis weight (N) of the negative active material satisfy a relational expression of 0.65?P/N?1.05.Type: GrantFiled: November 21, 2018Date of Patent: April 4, 2023Assignee: GS Yuasa International Ltd.Inventors: Sumio Mori, Tomonori Kako, Akihiko Miyazaki, Masashi Takano, Ukyo Harinaga
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Publication number: 20230081610Abstract: Provided is an intercell spacer that can maintain intercell distance even in a situation in which a cell has expanded inside a battery module at abnormally high temperature. The intercell spacer is arranged between battery cells that are adjacent to each other and includes a heat-resistant anti-compression portion having a Young's modulus of not less than a specific value at a specific temperature in a direction in which the battery cells are adjacent.Type: ApplicationFiled: December 28, 2020Publication date: March 16, 2023Applicant: ZEON CORPORATIONInventors: Akihiko MIYAZAKI, Yasuhiro ISSHIKI, Shiho MOSAKI
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Publication number: 20230022950Abstract: An energy storage device according to one aspect of the present invention includes: a negative electrode including a negative electrode substrate and a negative active material layer layered directly or indirectly on a surface of the negative electrode substrate; and a positive electrode. The negative active material layer contains a negative active material. The negative active material contains non-graphitizable carbon. In one direction of the negative electrode substrate, at least one end edge side of the negative active material layer is thicker than a central portion present between the one end edge side and the other end edge side facing the one end edge side. When a true density of the non-graphitizable carbon is A [g/cm3], an amount of charge B [mAh/g] of the negative electrode in a fully charged state satisfies the following formula 1.Type: ApplicationFiled: December 22, 2020Publication date: January 26, 2023Inventors: Kenta OGI, Kei KUMABAYASHI, Akihiko MIYAZAKI
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Patent number: 11515537Abstract: An energy storage device includes a negative electrode having a negative active material layer containing amorphous carbon as an active material, a curve attained by determining a rate of change (dQ/dV) in a potential (V) of the amorphous carbon in a discharge capacity (Q) of the amorphous carbon per unit quantity based on a result attained by measuring the potential (V) with respect to the discharge capacity (Q) and representing the rate of change (dQ/dV) with respect to the potential (V) has one or more peaks in a range in which the potential of the amorphous carbon is 0.8 V or more and 1.5 V or less, and a potential of the negative electrode at time of full charge is 0.25 V or more with respect to a lithium potential.Type: GrantFiled: November 21, 2018Date of Patent: November 29, 2022Assignee: GS YUASA INTERNATIONAL LTD.Inventors: Tomonori Kako, Akihiko Miyazaki, Masashi Takano, Kenta Nakai, Ukyo Harinaga
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Publication number: 20220271287Abstract: One aspect of the present invention is an energy storage device including a negative electrode including a negative electrode substrate and a negative active material layer stacked directly or indirectly on at least one surface of the negative electrode substrate, the negative active material layer containing a negative active material, the negative active material containing hollow graphite particles having a median diameter D1 and solid graphite particles having a median diameter D2 smaller than the median diameter of the hollow graphite particles.Type: ApplicationFiled: July 21, 2020Publication date: August 25, 2022Inventors: Kenta OGI, Kei KUMABAYASHI, Akihiko MIYAZAKI
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Patent number: 11283136Abstract: An energy storage device includes a positive electrode provided with a positive composite layer containing a positive active material, a negative electrode provided with a negative composite layer containing a negative active material, and a separator partitioning between the positive electrode and the negative electrode, wherein the separator includes a substrate uniaxially drawn into a sheet shape and a coating layer coating at least one of surfaces of the substrate, and the coating layer has an anisotropic structure with orientation in a direction different from a drawing direction of the substrate.Type: GrantFiled: September 24, 2015Date of Patent: March 22, 2022Assignee: GS Yuasa International Ltd.Inventors: Akihiko Miyazaki, Sumio Mori, Tomonori Kako
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Patent number: 11258065Abstract: An energy storage device includes: a positive electrode plate containing a positive composite layer including a positive active material capable of occluding and releasing a lithium ion; and a negative electrode plate containing a negative composite layer including a negative active material capable of occluding and releasing a lithium ion. A peak pore diameter Rp of the positive composite layer in a pore distribution measured by a mercury penetration method is 0.5 ?m or less, and a peak pore diameter Rn of the negative composite layer in a pore distribution measured by a mercury penetration method is 0.5 ?m or less. A ratio Rp/Rn of the peak pore diameter of the positive composite layer to the peak pore diameter of the negative composite layer is 0.60 or more and 1.70 or less.Type: GrantFiled: January 13, 2017Date of Patent: February 22, 2022Assignee: GS Yuasa International Ltd.Inventors: Shota Ito, Kenta Nakai, Akihiko Miyazaki, Tomonori Kako, Sumio Mori
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Patent number: 11114665Abstract: There is provided is an energy storage device having improved power performance at a relatively large current. In the present embodiment, an energy storage device is provided, which has a negative active material layer containing particulate amorphous carbon, wherein a distribution curve of differential pore volume in the negative active material layer has a peak appearing within the range from 0.1 ?m to 2 ?m inclusive and the differential pore volume at the peak is 0.9 cm3/g or more.Type: GrantFiled: August 28, 2017Date of Patent: September 7, 2021Assignee: GS Yuasa International Ltd.Inventors: Masashi Takano, Akihiko Miyazaki
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Publication number: 20210257618Abstract: An aspect of the present invention is an energy storage device including an electrode assembly that has a negative electrode and a positive electrode, where the negative electrode contains a negative electrode substrate and a negative active material, and has a negative active material layer disposed in an unpressed shape along at least one surface of the negative electrode substrate, the negative active material includes solid graphite particles as a main component, and the solid graphite particles have an aspect ratio of 1 or more and 5 or less.Type: ApplicationFiled: September 10, 2019Publication date: August 19, 2021Inventors: Kenta OGI, Fumiya NAKANO, Ryosuke SHIMOKAWA, Shota ITO, Masaki MASUDA, Taro YAMAFUKU, Kei KUMABAYASHI, Akihiko MIYAZAKI
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Publication number: 20200388845Abstract: An energy storage device includes a negative electrode having a negative active material layer containing amorphous carbon as an active material, a curve attained by determining a rate of change (dQ/dV) in a potential (V) of the amorphous carbon in a discharge capacity (Q) of the amorphous carbon per unit quantity based on a result attained by measuring the potential (V) with respect to the discharge capacity (Q) and representing the rate of change (dQ/dV) with respect to the potential (V) has one or more peaks in a range in which the potential of the amorphous carbon is 0.8 V or more and 1.5 V or less, and a potential of the negative electrode at time of full charge is 0.25 V or more with respect to a lithium potential.Type: ApplicationFiled: November 21, 2018Publication date: December 10, 2020Inventors: Tomonori KAKO, Akihiko MIYAZAKI, Masashi TAKANO, Kenta NAKAI, Ukyo HARINAGA
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Patent number: 10833349Abstract: An energy storage device includes: an electrode assembly which includes: an approximately rectangular positive electrode; an approximately rectangular negative electrode which is stacked alternately with the positive electrode; and a strip-like elongated separator having a base material layer and an inorganic layer which is made to overlap with the first base material layer, wherein the elongated separator is arranged between the positive electrode and the negative electrode, and the base material layer of the elongated separator faces the negative electrode in an opposed manner between the positive electrode and the negative electrode.Type: GrantFiled: March 14, 2016Date of Patent: November 10, 2020Assignee: GS YUASA INTERNATIONAL LTD.Inventors: Kenta Nakai, Tomonori Kako, Akihiko Miyazaki, Sumio Mori
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Publication number: 20200295364Abstract: The present embodiment provides a lithium ion secondary battery including a positive electrode containing LiaNixCoyMzO2 (0.9?a?1.2, 0.3?x?0.8, 0.2?y+z?0.7, where M is a metal element other than Li, Ni, and Co) as a positive active material, and a negative electrode containing non-graphitic carbon as a negative active material. In this lithium ion secondary battery, at a portion where the positive electrode and the negative electrode face each other, a basis weight (P) of the positive active material and a basis weight (N) of the negative active material satisfy a relational expression of 0.65?P/N?1.05.Type: ApplicationFiled: November 21, 2018Publication date: September 17, 2020Inventors: Sumio MORI, Tomonori KAKO, Akihiko MIYAZAKI, Masashi TAKANO, Ukyo HARINAGA
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Patent number: 10748715Abstract: An energy storage device is provided in which a decrease in power caused by repetitive charge-discharge in a high-temperature environment is suppressed. In the present embodiment, an energy storage device and a method for manufacturing the energy storage device are provided, the energy storage device including an electrode which includes: an active material layer including a particulate active material; and a conductive layer layered on the active material layer and including a conduction aid. An average secondary particle diameter of the active material is 2.5 ?m or more and 6.0 ?m or less. A surface roughness Ra of the conductive layer on a side on the active material layer is 0.17 ?m or more and 0.50 ?m or less.Type: GrantFiled: April 25, 2017Date of Patent: August 18, 2020Assignee: GS Yuasa International Ltd.Inventors: Kazuki Kawaguchi, Akihiko Miyazaki, Sumio Mori
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Publication number: 20200144615Abstract: There is provided an energy storage device which can have a relatively high initial power and whereby it becomes possible to prevent the occurrence of electrodeposition of lithium even when a charge-discharge procedure is performed repeatedly at a high rate.Type: ApplicationFiled: November 6, 2018Publication date: May 7, 2020Inventors: Tomonori KAKO, Akihiko MIYAZAKI, Kenta NAKAI, Shota ITO
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Publication number: 20190237764Abstract: There is provided is an energy storage device having improved power performance at a relatively large current. In the present embodiment, an energy storage device is provided, which has a negative active material layer containing particulate amorphous carbon, wherein a distribution curve of differential pore volume in the negative active material layer has a peak appearing within the range from 0.1 ?m to 2 ?m inclusive and the differential pore volume at the peak is 0.9 cm3/g or more.Type: ApplicationFiled: August 28, 2017Publication date: August 1, 2019Inventors: Masashi TAKANO, Akihiko MIYAZAKI
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Publication number: 20190131080Abstract: An energy storage device is provided in which a decrease in power caused by repetitive charge-discharge in a high-temperature environment is suppressed. In the present embodiment, an energy storage device and a method for manufacturing the energy storage device are provided, the energy storage device including an electrode which includes: an active material layer including a particulate active material; and a conductive layer layered on the active material layer and including a conduction aid. An average secondary particle diameter of the active material is 2.5 ?m or more and 6.0 ?m or less. A surface roughness Ra of the conductive layer on a side on the active material layer is 0.17 ?m or more and 0.50 ?m or less.Type: ApplicationFiled: April 25, 2017Publication date: May 2, 2019Inventors: Kazuki KAWAGUCHI, Akihiko MIYAZAKI, Sumio MORI
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Publication number: 20190027753Abstract: An energy storage device of which endurance capacity retention ratio is improved is provided. An energy storage device 10 includes: a positive electrode plate 12 containing a positive composite layer including a positive active material capable of occluding and releasing a lithium ion; and a negative electrode plate 13 containing a negative composite layer including a negative active material capable of occluding and releasing a lithium ion. A peak pore diameter Rp of the positive composite layer in a pore distribution measured by a mercury penetration method is 0.5 ?m or less, and a peak pore diameter Rn of the negative composite layer in a pore distribution measured by a mercury penetration method is 0.5 ?m or less. A ratio Rp/Rn of the peak pore diameter of the positive composite layer to the peak pore diameter of the negative composite layer is 0.60 or more and 1.70 or less.Type: ApplicationFiled: January 13, 2017Publication date: January 24, 2019Inventors: Shota ITO, Kenta NAKAI, Akihiko MIYAZAKI, Tomonori KAKO, Sumio MORI