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    GRAPHENE POWDER, METHOD FOR PRODUCING GRAPHENE POWDER AND ELECTRODE FOR LITHIUM ION BATTERY CONTAINING GRAPHENE POWDER
    3.
    发明专利
    GRAPHENE POWDER, METHOD FOR PRODUCING GRAPHENE POWDER AND ELECTRODE FOR LITHIUM ION BATTERY CONTAINING GRAPHENE POWDER 未知

    公开(公告)号：CA2872445A1

    公开(公告)日：2013-12-12

    申请号：CA2872445

    申请日：2013-05-23

    Applicant: TORAY INDUSTRIES

    Inventor： SUN PEIYU ,  LIU GANGQIAO ,  WU ZHENQI ,  WU GANG ,  TAMAKI EIICHIRO ,  KUBOTA YASUO

    IPC: C01B31/00 ,  H01M4/62

    Abstract: In order to prepare a highly conductive and highly dispersible graphene powder and to obtain an electrode for a lithium ion battery with excellent performance utilizing the highly conductive and highly dispersible graphene, a graphene powder and a preparation method thereof is provided. The graphene powder comprises a compound having a catechol group adsorbing on the surface of graphene in a weight ratio of 5-50% relative to the grapheme and the element ratio of oxygen to carbon in the graphene powder measured by X-ray photoelectron spectroscopy is 0.06 or more and 0.20 or less. The method for producing a graphene powder comprise the step of reducing a graphite oxide with a reducing agent having no catechol group in the presence of a compound having a catechol group.

    GRAPHENE POWER, PRODUCTION METHOD THEREOF, AND ELECTROCHEMICAL DEVICE COMPRISING SAME
    4.
    发明专利
    GRAPHENE POWER, PRODUCTION METHOD THEREOF, AND ELECTROCHEMICAL DEVICE COMPRISING SAME 未知

    公开(公告)号：CA2819316C

    公开(公告)日：2018-06-05

    申请号：CA2819316

    申请日：2011-12-09

    Applicant: TORAY INDUSTRIES

    Inventor： SUN PEIYU ,  WU ZHENQI ,  LIU GANGQIAO ,  TAMAKI EIICHIRO ,  KUBOTA YASUO ,  WU GANG

    IPC: C01B32/182 ,  C01B32/192 ,  H01M4/133

    Abstract: Provided are a graphene powder, a production method thereof, and an electrochemical device comprising the same. The graphene powder has an elemental ratio of oxygen atoms to carbon atoms of not less than 0.07 and not more than 0.13 and an elemental ratio of nitrogen atoms to carbon atoms of not more than 0.01. In the production method, the graphene powder is produced by using a dithionous acid salt as a reducing agent. Since the graphene has a low content of nitrogen atoms and a proper amount of oxygen atoms and a proper defect, the graphene is provided with good performance of both dispersibility and conductive property, and is usable as a good conductive additive, such as the one for a lithium ion battery electrode. The production method has the advantages of low cost, high efficiency and low toxicity.

    GRAPHEME POWDER, PRODUCTION METHOD THEREOF, AND ELECTROCHEMICAL DEVICE COMPRISING SAME
    7.
    发明专利
    GRAPHEME POWDER, PRODUCTION METHOD THEREOF, AND ELECTROCHEMICAL DEVICE COMPRISING SAME 未知

    公开(公告)号：CA2819316A1

    公开(公告)日：2012-06-14

    申请号：CA2819316

    申请日：2011-12-09

    Applicant: TORAY INDUSTRIES

    Inventor： SUN PEIYU ,  WU ZHENQI ,  LIU GANGQIAO ,  TAMAKI EIICHIRO ,  KUBOTA YASUO ,  WU GANG

    IPC: C01B31/00 ,  C01B31/02 ,  H01M4/00

    Abstract: Provided are a graphene powder, a production method thereof, and an electrochemical device comprising the same. The graphene powder has an elemental ratio of oxygen atoms to carbon atoms of not less than 0.07 and not more than 0.13 and an elemental ratio of nitrogen atoms to carbon atoms of not more than 0.01. In the production method, the graphene powder is produced by using a dithionous acid salt as a reducing agent. Since the graphene has a low content of nitrogen atoms and a proper amount of oxygen atoms and a proper defect, the graphene is provided with good performance of both dispersibility and conductive property, and is usable as a good conductive additive, such as the one for a lithium ion battery electrode. The production method has the advantages of low cost, high efficiency and low toxicity.

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