...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Russian Journal of Physical Chemistry >The structure and charge-storage capacitance of carbonized films based on silicon-polymer nanocomposites
【24h】

The structure and charge-storage capacitance of carbonized films based on silicon-polymer nanocomposites

机译：基于硅聚合物纳米复合材料的碳化膜的结构和电荷存储电容

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

New film materials for electrodes of lithium batteries were synthesized and studied. Thin-film silicon-polymer composites were prepared by vacuum cocondensation of silicon and the monomer onto a substrate cooled with liquid nitrogen; the polymerization and formation of the nanostructured composite were performed at room temperature. The films were carbonized by vacuum annealing. The film composition and microstructure were studied by AFM, SEM, Raman spectroscopy, and X-ray spectral microanalysis. It was shown that the polymer matrix became almost fully carbonized because of pyrolysis. The silicon concentration in the films varied from 2 to 5 at %. The concentration of silicon nanoparticles on carbonized film surfaces was similar to 106 cm-2. Electrochemical experiments with lithium insertion into the composite films were performed in standard three-electrode cells under galvanostatic conditions. The specific capacitance of the films was measured. It was shown that the samples were capable of long-term cycling; the capacitance decreased by only 6% during the first 200 cycles; after 250 cycles, the capacitance still exceeded 80% of its initial value. The mechanism of lithium insertion into the films was discussed. It was concluded that long-term stability during cycling was caused by the presence of silicon both as nanoparticles and in the atomically dispersed form.
机译：合成并研究了新型锂电池电极膜材料。薄膜硅-聚合物复合材料是通过将硅和单体真空共缩合到用液氮冷却的基材上制得的;在室温下进行聚合和形成纳米结构复合材料。通过真空退火使膜碳化。通过AFM，SEM，拉曼光谱和X射线光谱显微分析研究了膜的组成和微观结构。结果表明，由于热解，聚合物基质几乎完全碳化。薄膜中的硅浓度为2至5 at％。碳化膜表面上硅纳米颗粒的浓度类似于106 cm-2。将锂插入复合膜中的电化学实验是在恒电流条件下在标准的三电极电池中进行的。测量膜的比电容。结果表明，样品能够长期循环。在前200个周期中，电容仅降低了6％; 250次循环后，电容仍超过其初始值的80％。讨论了锂插入薄膜的机理。结论是，循环过程中的长期稳定性是由硅作为纳米颗粒和原子分散形式的存在引起的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号