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    • 7. 发明申请
    • Composite carbon material of negative electrode in lithuim ion battery and its preparation method
    • 锂离子电池负极复合碳材料及其制备方法
    • US20090136849A1
    • 2009-05-28
    • US11921205
    • 2006-03-29
    • Min YueWanhong Zhang
    • Min YueWanhong Zhang
    • H01M4/58B05D5/12H01M4/04
    • H01M4/587H01M4/1393H01M10/0525Y02E60/122
    • A composite carbon material of negative electrode in lithium ion, which is made of composite graphite, includes a spherical graphite and a cover layer, wherein the cover layer is pyrolytic carbon of organic substance. Inserted transition metal elements are contained between layers of graphite crystal. Preparation of the negative electrode includes the steps of: crushing graphite, shaping to form a spherical shape, purifying treatment, washing, dewatering and drying, dipped in salt solution doped by transition metal in multivalence, mixed with organic matter, covering treatment, and carbonizing treatment or graphitization treatment. The negative electrode provides advantages of reversible specific capacity larger than 350 mAh/g, coulomb efficiency higher than 94% at first cycle, conservation rate for capacity larger than 8-% in 500 times of circulation.
    • 由复合石墨制成的锂离子负极复合碳材料包括球形石墨和覆盖层,其中覆盖层是有机物质的热解碳。 嵌入的过渡金属元素包含在石墨晶体层之间。 负极的制备包括以下步骤:粉碎石墨,成形为球形,净化处理,洗涤,脱水和干燥,浸渍在多价掺杂过渡金属的盐溶液中,与有机物混合,覆盖处理和碳化 治疗或石墨化治疗。 负极提供可逆比容量大于350 mAh / g的优点,库仑效率在第一次循环时高于94%,在循环500次时容量大于8%的保存率。