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    • 4. 发明申请
    • Negative electrodes for rechargeable batteries
    • 可充电电池用负极
    • US20040229125A1
    • 2004-11-18
    • US10771010
    • 2004-02-02
    • Caisong ZouChuanfu WangJunqing Dong
    • H01M004/58H01M004/62H01M004/04
    • H01M4/0471C01B32/20C01P2004/61H01M4/366H01M4/587Y10T29/49115Y10T428/2982Y10T428/30
    • This invention relates to a negative electrode of a rechargeable battery. In particular, the active material for the negative electrode is a mixture of two types of graphite, graphite A and graphite B. Graphite A are of graphite granules having an average granule diameter between 10 and 40 nullm, and a crystallite interlayer spacing, d002, between 0.335 and 0.342 nm. Graphite B are graphite granules with an average granule diameter between 5 and 30 nullm and a crystallite interlayer spacing, d002, between 0.336 and 0.360 nm. The ratio of the weight of the graphite A and graphite B is between 25:75 to 80:20. To fabricate said negative electrode, take said mixture of graphite A and graphite B, add binder, dispersant, and solvent. Then stir to mix, coating the resultant mixture on a foil, heat to dry, and compress to form the negative electrode. A lithium ion rechargeable battery made with said negative electrode has high discharge capacity, long cycle life, excellent high current and safety characteristics. The manufacturing process for this negative electrode is simple and cheap and therefore, it is easy to implement for mass production.
    • 本发明涉及可再充电电池的负电极。 特别地,负极活性物质是两种类型的石墨,石墨A和石墨B的混合物。石墨A是石墨颗粒,其平均颗粒直径在10至40μm之间,微晶层间距d002, 在0.335和0.342nm之间。 石墨B是石墨颗粒,其平均颗粒直径在5-30μm之间,微晶层间距d002在0.336和0.360nm之间。 石墨A和石墨B的重量比在25:75至80:20之间。 为了制造所述负极,取石墨A和石墨B的混合物,加入粘合剂,分散剂和溶剂。 然后搅拌混合,将所得混合物涂覆在箔上,加热干燥,并压缩形成负极。 由所述负极制成的锂离子可充电电池具有高放电容量,较长的循环寿命,优异的高电流和安全特性。 该负极的制造方法简单便宜,因此易于实现批量生产。