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首页> 外文期刊>Journal of power sources >Polymer-derived-SiCN ceramic/graphite composite as anode material with enhanced rate capability for lithium ion batteries
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Polymer-derived-SiCN ceramic/graphite composite as anode material with enhanced rate capability for lithium ion batteries

机译：聚合物衍生的SiCN陶瓷/石墨复合材料作为锂离子电池倍率性能增强的负极材料

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摘要

We report on a new composite material in view of its application as a negative electrode in lithium-ion batteries. A commercial preceramic polysilazane mixed with graphite in 1:1 weight ratio was transformed into a SiCN/graphite composite material through a pyrolytic polymer-to-ceramic conversion at three different temperatures, namely 950℃, 1100℃ and 1300°C By means of Raman spectroscopy we found successive ordering of carbon clusters into nano-crystalline graphitic regions with increasing pyrolysis temperature. The reversible capacity of about 350mAhg~(-1) was measured with constant current charging/discharging for the composite prepared at 1300 ℃. For comparison pure graphite and pure polysilazane-derived SiCN ceramic were examined as reference materials. During fast charging and discharging the composite material demonstrates enhanced capacity and stability. Charging and discharging in half an hour lead to about 200 and 10 mAh g~(-1), for the composite annealed at 1300℃ and pure graphite, respectively. A clear dependence between the final material capacity and pyrolysis temperature is found and discussed with respect to possible application in batteries, i.e. practical discharging potential limit. The best results in terms of capacity recovered under 1V and high rate capability were also obtained for samples synthesized at 1300℃.
机译：考虑到新型复合材料作为锂离子电池负极的应用，我们将对其进行报道。通过在三种不同的温度（即950℃，1100℃和1300℃）下通过热解聚合物转化为陶瓷，将以1：1重量比与石墨混合的商品化的陶瓷前聚硅氮烷转化为SiCN /石墨复合材料。光谱学中，我们发现随着热解温度的升高，碳簇向纳米晶石墨区域的连续排列。在1300℃制备的复合材料中，通过恒流充放电测得可逆容量约为350mAhg〜（-1）。为了比较，将纯石墨和纯聚硅氮烷衍生的SiCN陶瓷作为参考材料。在快速充电和放电期间，复合材料表现出增强的容量和稳定性。在1300℃退火的复合材料和纯石墨中，半小时的充电和放电分别导致约200和10 mAh g〜（-1）。发现并讨论了最终材料容量与热解温度之间的明确相关性，并讨论了其在电池中的可能应用，即实际放电电位极限。在1300℃合成的样品中，在1V下恢复的容量和高倍率容量方面也获得了最好的结果。

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  • 来源
    《Journal of power sources》 |2011年第15期|p.6412-6418|共7页
  • 作者

    M. Graczyk-Zajac; C. Fasel; R. Riedel;

  • 作者单位

    Institutflir Materiatwissenschaft, Fachgebiet Disperse Feststoffe. Technische UniversitSt Darmstadt, Petersenstr. 23,64287 Darmstadt, Germany;

    Institutflir Materiatwissenschaft, Fachgebiet Disperse Feststoffe. Technische UniversitSt Darmstadt, Petersenstr. 23,64287 Darmstadt, Germany;

    Institutflir Materiatwissenschaft, Fachgebiet Disperse Feststoffe. Technische UniversitSt Darmstadt, Petersenstr. 23,64287 Darmstadt, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    li-ion batteries; anode; graphite; sicn ceramic;

    机译：锂离子电池;阳极;石墨;陶瓷;

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