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公开(公告)号：US10734650B2
公开(公告)日：2020-08-04
申请号：US15770866
申请日：2016-10-27
Applicant: KURARAY CO., LTD.
Inventor： Tomohiro Kawakami , Sayaka Ide , Takafumi Izawa , Taketoshi Okuno , Jun-Sang Cho , Hideharu Iwasaki
IPC: H01M4/13 , H01M4/587 , C01B32/05 , H01M10/0525 , H01M4/02
Abstract: Provided is a carbonaceous material used in a negative electrode of a non-aqueous electrolyte secondary battery that shows favorable charge/discharge capacities and low resistance and having favorable resistance to oxidative degradation. The carbonaceous material has an average interplanar spacing d002 of the (002) plane of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area of 20 to 65 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.3 mass % or less, an oxygen element content of 2.5 mass % or less, and an average particle diameter of 1 to 4 μm according to a laser scattering method.
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公开(公告)号：US11345601B2
公开(公告)日：2022-05-31
申请号：US16322240
申请日：2017-08-02
Applicant: KURARAY CO., LTD.
Inventor： Takafumi Izawa , Keiichi Nishimura , Taketoshi Okuno , Hideharu Iwasaki
IPC: C01B32/318 , H01M4/587 , C01B32/336 , C01B32/30 , H01M4/04 , H01M4/02
Abstract: The present invention relates to a carbonaceous material that is suitable for the negative pole active substance of a nonaqueous electrolyte secondary battery, a negative pole for a nonaqueous electrolyte secondary battery comprising the carbonaceous material, a nonaqueous electrolyte secondary battery having the negative pole, and a method for producing the carbonaceous material. This carbonaceous material is for a negative pole active substance of a nonaqueous electrolyte secondary battery. The carbonaceous material is derived from plants, the half-width of the peak at approximately 1360 cm-1 of the Raman spectrum observed by laser Raman spectroscopy is 190 to 240 cm-1, and the specific surface area as found by multipoint BET analysis of nitrogen adsorption is 10 to 100 m2/g.
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Patent Agency Ranking
公开(公告)号：US11637286B2
公开(公告)日：2023-04-25
申请号：US16628189
申请日：2018-07-04
Applicant: KURARAY CO., LTD.
Inventor： Takafumi Izawa , Kengo Tachikawa , Hideharu Iwasaki
IPC: H01M4/587 , C01B32/05 , H01M10/052 , H01B1/04 , H01M4/02
Abstract: The present invention provides a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities, and preferably high charge/discharge efficiency and low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen content obtained by elemental analysis of 3.5 mass % or more, a ratio of nitrogen content and hydrogen content (RN/H) of 6 or more and 100 or less, a ratio of oxygen content and nitrogen content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 Å or more.
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公开(公告)号：US11355755B2
公开(公告)日：2022-06-07
申请号：US15770767
申请日：2016-10-27
Applicant: KURARAY CO., LTD.
Inventor： Tomohiro Kawakami , Takafumi Izawa , Taketoshi Okuno , Jun-Sang Cho , Hideharu Iwasaki
Abstract: A carbonaceous material for a non-aqueous electrolyte secondary battery, having an average interplanar spacing d002 of the (002) plane within a range of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area within a range of 8 to 30 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.5 mass % or less, an oxygen element content of 0.3 mass % or less, and an average particle diameter of 1 to 2.8 μm according to a laser scattering method.
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公开(公告)号：US12080890B2
公开(公告)日：2024-09-03
申请号：US18063092
申请日：2022-12-08
Applicant: KURARAY CO., LTD.
Inventor： Takafumi Izawa , Kengo Tachikawa , Hideharu Iwasaki
IPC: H01M4/587 , C01B32/05 , H01B1/04 , H01M4/02 , H01M10/052
CPC classification number: H01M4/587 , C01B32/05 , H01B1/04 , H01M10/052 , C01P2002/78 , C01P2002/82 , C01P2006/12 , C01P2006/14 , C01P2006/40 , C01P2006/80 , H01M2004/021 , H01M2004/027
Abstract: The present invention provides a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities, and preferably high charge/discharge efficiency and low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen content obtained by elemental analysis of 3.5 mass % or more, a ratio of nitrogen content and hydrogen content (RN/H) of 6 or more and 100 or less, a ratio of oxygen content and nitrogen content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 Å or more.
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公开(公告)号：US20230257491A1
公开(公告)日：2023-08-17
申请号：US18003775
申请日：2021-06-30
Applicant: KURARAY CO., LTD.
Inventor： Yasutaka Inubushi , Keishi Hachiya , Masaki Kato , Yoshikazu Yamasaki , Makoto Okamoto , Kazuyuki Somemiya , Takafumi Izawa
Abstract: [Problem to be solved] To provide a traceable vinyl acetate, a polymer containing the vinyl acetate, and a vinyl alcohol polymer which is a saponified product of the polymer.
[Solution] Vinyl acetate having a ratio of carbon-14 to total carbon of 1.0×10−4 or more, a vinyl acetate polymer containing the vinyl acetate as a monomer unit and a vinyl alcohol polymer obtained by saponifying the vinyl acetate polymer.-
公开(公告)号：US11492260B2
公开(公告)日：2022-11-08
申请号：US16628191
申请日：2018-07-04
Applicant: KURARAY CO., LTD.
Inventor： Takafumi Izawa , Kengo Tachikawa , Hideharu Iwasaki
IPC: C01B32/05
Abstract: A problem to be solved by the present invention is to provide a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities and preferably high charge/discharge efficiency as well as low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen element content of 1.0 mass % or more and an oxygen content of 1.5 mass % or less obtained by elemental analysis, a ratio of nitrogen element content and hydrogen element content (RN/H) of 6 or more and 100 or less, a ratio of oxygen element content and nitrogen element content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 Å or more.
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