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    Lithium secondary battery
    1.
    发明授权
    Lithium secondary battery 失效

    公开(公告)号：US06620553B2

    公开(公告)日：2003-09-16

    申请号：US09900875

    申请日：2001-07-10

    申请人： Tohru Shiga ,  Akihiko Koiwai ,  Shigehiro Kawauchi

    发明人： Tohru Shiga ,  Akihiko Koiwai ,  Shigehiro Kawauchi

    IPC分类号： H01M1040

    CPC分类号： H01M10/0565 ,  H01M4/13 ,  H01M4/485 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/4235 ,  H01M10/446 ,  H01M2300/004 ,  Y02T10/7011

    摘要： A lithium secondary battery exhibiting very high safety, which is ensured by restraining both the generation of flammable gas caused by the decomposition of an electrolyte, and the emission of oxygen from a positive active material even during overcharging. The lithium secondary battery includes a positive electrode of which an active material is a lithium transition metal composite oxide, a negative electrode of which an active material is a carbon material, and a nonaqueous electrolyte containing an organic solvent in which a lithium salt is dissolved. The nonaqueous electrolyte contains at least one kind of conductive polymer-forming monomers which have an alkyl group and is electrochemically polymerizable on the positive electrode within a battery operation voltage, and at least one kind of film-forming agents which electrochemically decompose within the battery operation voltage to form films on a surface of the negative electrode.

    Negative electrode material for lithium secondary batteries
    2.
    发明授权
    Negative electrode material for lithium secondary batteries 失效
    锂二次电池用负极材料

    公开(公告)号：US5958622A

    公开(公告)日：1999-09-28

    申请号：US824294

    申请日：1997-03-26

    申请人： Yoshitsugu Kojima ,  Akihiko Koiwai ,  Nobuaki Suzuki ,  Satoru Yamamoto

    发明人： Yoshitsugu Kojima ,  Akihiko Koiwai ,  Nobuaki Suzuki ,  Satoru Yamamoto

    IPC分类号： H01M4/02 ,  H01M4/58 ,  H01M4/587

    CPC分类号： H01M4/587 ,  H01M4/364 ,  H01M2004/027 ,  H01M4/625

    摘要： A negative electrode material capable of absorbing and desorbing lithium is comprised of a mixture of coke and graphite. The amount of graphite in the mixture is near to that which induces percolation transition. Preferably, the amount of graphite in the mixture is 2 to 37 wt % relative to the total amount of the coke and graphite. The coke may be prepared by heating raw coke from oil or coal at 500 to 900.degree. C. The coke may be 0.06 or more in the atomic ratio of hydrogen to carbon and 0.003 or more in the atomic ratio of oxygen to carbon. The graphite may be 0.5 .mu.m to 30 .mu.m in a mean particle size. Lithium secondary batteries comprising the negative electrodes have a large discharge capacity.

    摘要翻译： 能够吸收和解吸锂的负极材料由焦炭和石墨的混合物构成。 混合物中石墨的量接近于引起渗透转变的石墨。 优选地，混合物中石墨的量相对于焦炭和石墨的总量为2〜37重量％。 焦炭可以通过在500〜900℃下从油或煤中加热原焦炭来制备。焦炭可以以氢与碳的原子比为0.06以上，氧与碳的原子比为0.003以上。 石墨的平均粒径可以为0.5〜30μm。 包括负极的锂二次电池具有大的放电容量。