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    • 6. 发明申请
    • NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, PREPARATION METHOD OF THE SAME, AND LITHIUM SECONDARY BATTERY CONTAINING THE SAME
    • 用于锂二次电池的负极电极活性材料,其制备方法和含有该二次电池的锂二次电池
    • US20110262812A1
    • 2011-10-27
    • US12990177
    • 2009-04-28
    • Kyung-Hee HanJeong-Hun OhJong-Sung KimChul YoumJung-Min Han
    • Kyung-Hee HanJeong-Hun OhJong-Sung KimChul YoumJung-Min Han
    • H01M4/583H01B1/04B82Y30/00B82Y40/00
    • H01M4/587H01M4/362H01M4/364H01M10/052
    • The present invention relates to a negative electrode active material for a lithium secondary battery, a preparation method thereof, and a lithium secondary battery containing the negative electrode active material. The negative electrode active material for the lithium secondary battery according to the present invention is formed by mixing: a carbon material coated with vapor growth carbon fiber (VGCF) and amorphous graphite; and one or more kinds of other carbon material selected from natural graphite, artificial graphite, amorphous-coated graphite, resin-coated graphite and amorphous carbon. According to the present invention, when the negative electrode active material is prepared, the carbon fiber is uniformly dispersed throughout the carbon material, and the carbon material is coated with the amorphous graphite and then mixed with other carbon materials, and thus, a high electrode density can be achieved. Accordingly, even with high electrode density, the invention can provide the negative electrode active material with excellent electrochemical properties such as charge/discharge efficiency and cycle characteristics.
    • 本发明涉及锂二次电池用负极活性物质及其制备方法以及含有负极活性物质的锂二次电池。 根据本发明的锂二次电池用负极活性物质是通过混合涂覆有气相生长碳纤维(VGCF)和无定形石墨的碳材料形成的; 以及选自天然石墨,人造石墨,非晶涂覆石墨,树脂涂覆石墨和无定形碳中的一种或多种其它碳材料。 根据本发明,制备负极活性物质时,碳纤维均匀分散在碳材料中,碳材料被非晶质石墨覆盖,然后与其他碳材料混合,从而形成高电极 密度可以达到。 因此,即使高电极密度,本发明也可以提供具有优异的电化学性能如充电/放电效率和循环特性的负极活性材料。