石墨碎锂电池负极材料包覆炭化的研究

发布时间：2018-01-12 08:12

本文关键词：石墨碎锂电池负极材料包覆炭化的研究　出处：《炭素技术》2017年05期 　论文类型：期刊论文

【摘要】：以煤沥青为包覆材料,煤油为溶剂,对除杂整形后的石墨碎进行包覆炭化改性处理,得到的样品进行物理特性分析,并组装电池进行电性能测试。结果表明,随着包覆量的增加,颗粒平均粒度也增加,但增加幅度较小,为1~2μm;样品的比表面积随着包覆量的增加而降低,经过沥青包覆和石墨化后,样品的比表面积由6.715 m~2/g大幅度降低到1.618 m~2/g;振实密度随着包覆量的增加而提高,最高可达1.05 g/cm~3。经过包覆后样品的层间距d002有所增加。包覆后样品的表面逐渐平滑,棱角少,并且炭化后的沥青炭填充了部分石墨颗粒的孔隙,降低了比表面积,未包覆的样品表面粗糙,有较多的沟壑、孔隙。样品随着包覆量的增加,首次放电容量和首次充放电效率都呈现出增加的趋势,首次放电容量由316.56 m A·h/g升至330.82 m A·h/g,首次放电效率由89.09%升至94.45%,当沥青包覆量达10%时,首次放电容量和首次充放电效率均达最大。
[Abstract]:With coal pitch as coating material and kerosene as solvent, the graphite scrap after removing impurity and shaping was treated by carbonization modification, the physical properties of the obtained sample were analyzed, and the electrical properties of the battery were tested. With the increase of the coating amount, the average particle size also increased, but the increase was relatively small (1 渭 m). The specific surface area of the sample decreased with the increase of the coating amount. After bitumen coating and graphitization, the specific surface area of the sample decreased from 6.715 mg / 2 / g to 1.618 mm2 / g; The vibrational density increases with the increase of coating amount, and the maximum value is 1.05 g / cm ~ (-3). After coating, the interlayer spacing of the sample increases, and the surface of the sample is smooth and the angle is less. And the carbonized bituminous carbon filled part of the graphite particle pores, reduced the specific surface area, the surface of the uncoated sample is rough, there are more gully, pore. The sample with the increase of the amount of coating. The initial discharge capacity and the first charge / discharge efficiency increased from 316.56 Ma 路h / g to 330.82 Ma 路h / g. The initial discharge efficiency increases from 89.09% to 94.45, and the first discharge capacity and the first charge discharge efficiency reach the maximum when the asphalt coating reaches 10.
【作者单位】：炼焦煤资源开发及综合利用国家重点实验室;中国平煤神马集团技术中心;
【基金】：炼焦煤资源开发及综合利用国家重点实验室重点攻关项目(41040220161502)
【分类号】：TM912
【正文快照】： 锂离子电池是目前应用最为广泛的电化学储能器件之一,其具有能量密度高、输出功率大、无记忆效应等诸多优点,被广泛应用[1-2]。其中负极材料直接决定了锂离子电池的比容量、使用寿命和电池成本等,目前石墨类负极材料成为市场上唯一大规模应用的锂离子电池负极材料。但石墨材料

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