Co9S8@CNFs复合材料的制备及其在锂离子电池的应用

doi:10.3969/j.issn.1672-6952.2022.06.004

摘要/Abstract

摘要：

静电纺丝是一种使聚合物在高压静电场作用下进行拉伸纺丝的纤维制造工艺。静电纺丝制备方法简单，成本低且易纺出微纳米级的纤维，在材料化学领域被广泛应用。采用硫杂杯芳烃构筑的多硫高核笼簇化合物（Co₄₈）为负载物，以聚丙烯腈（PAN）和聚甲基丙烯酸甲酯（PMMA）共混物（PAN/PMMA）为纺丝载体，通过静电纺丝技术，制备了负载Co₉S₈纳米颗粒的碳纳米纤维（Co₉S₈@CNFs）。分别以PAN和PMMA质量比为10∶0、7∶3和5∶5的纺丝载体制备复合物纳米纤维，将其热处理后得到的碳纳米纤维复合材料作为电极材料用于锂离子电池材料的研究。与Co₄₈晶体煅烧的产物相比，PAN和PMMA的加入对最终产物的电化学有促进作用。由PAN和PMMA混合物制备的复合物材料兼具较高比容量、良好循环稳定性以及倍率性能。

关键词: 静电纺丝, 碳纳米纤维, 金属?杯芳烃核簇, 锂离子电池

Abstract:

Electrospinning is a fiber manufacturing process in which polymers are drawn and spun under the action of a high?voltage electrostatic field. This method has been widely used in material chemistry due to the simple preparation, low cost as well as easily available of micro?nano?scale fibers. In this paper, a polysulfur high?nucleus caged compound (Co₄₈) constructed by thiacalixarene was used as the loading material, and polyacrylonitrile (PAN) and polymethyl methacrylate (PMMA) blend (PAN/PMMA) was used as the spinning support, Co₉S₈ nanoparticles loaded carbon nanofibers (Co₉S₈@CNFs) were prepared by electrospinning technique. Composite nanofibers were prepared by spinning carriers with PAN and PMMA mass ratios of 10∶0, 7∶3 and 5∶5, respectively, and the carbon nanofiber composites obtained after heat treatment were used as electrode materials for the study of lithium?ion battery materials. The addition of PAN and PMMA has a positive effect on the electrochemistry of the final product compared to the calcined product of Co₄₈ crystals. The composites fabricated from PAN and PMMA presented high specific capacity，good cycling stability and rate capability.

Key words: Electrospinning, Carbon nanofiber, Metal?calixarene core clusters, Lithium?ion battery

中图分类号:

O632

周嘉琪, 杨思然, 艾绯雪, 赵桂艳, 毕研峰. Co₉S₈@CNFs复合材料的制备及其在锂离子电池的应用[J]. 辽宁石油化工大学学报, 2022, 42(6): 21-27.

Jiaqi Zhou, Siran Yang, Feixue Ai, Guiyan Zhao, Yanfeng Bi. Preparation of Co₉S₈@CNFs Composites and their Application in Lithium⁃Ion Batteries[J]. Journal of Liaoning Petrochemical University, 2022, 42(6): 21-27.

图/表 11

图1 在氮气气氛下Co48簇和Co48@PAN/PMMA?NFs?5∶5煅烧产物的PXRD测试谱图

图2 复合材料的扫描电子显微镜图片

图3 复合材料的透射电子显微镜图片

图4 Co9S8@CN和Co9S8@CNFs?5∶5的热重曲线

图5 四种复合材料的XPS能谱图

图6 Co9S8@CN高分辨率电子能谱图

图7 Co9S8@CNFs?10∶0和Co9S8@CNFs?5∶5的高分辨率XPS谱图

图8 四种复合材料的CV循环曲线

图9 四种复合材料在0.01~3.00 V的第1、第2和第10圈循环中的恒电流放电/充电电压分布曲线

图10 四种复合材料的倍率性能

图11 四种复合材料的循环性能

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Co₉S₈@CNFs复合材料的制备及其在锂离子电池的应用

Preparation of Co₉S₈@CNFs Composites and their Application in Lithium⁃Ion Batteries

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