微流控芯片技术制备石墨烯纤维及其柔性超级电容器的性能研究

The research and development of new materials and new energy storage devices have attracted much attention in the whole world. In particular, developing new-type fiber-based electrode materials and their flexible energy storage devices is a very important research direction. However, this impacts higher requirements on properties of fiber electrode materials and flexible energy storage devices, including high bendability, stretchablity, foldability as well as high energy storage density. By virtue of its unique structure, excellent conductivity and favorable mechanical and outstanding electrochemical properties, graphene-based fiber is expected to be a novel flexible fiber electrode material with high performance and great potential. To this end, this project was aimed at studying key technologies of microfluidic fabrication and structure adjustment of graphene based fibers as well as its application in flexible supercapacitors. At first, graphene and graphene composite fibers with controllable structure and shape as well as adjustable diameters were prepared through the microfluidic chip technology and wet-spinning process. Then, the resulting integrated graphene (composite) fiber material prepared by microfluidic chip and wet-spinning technologies was applied for the innovative flexible (e.g. bendable, extensible and foldable) linear supercapacitors, and for interconnected modularization via serial and parallel integration. Finally, this research will provide a scientific and technological basis for massive production of high-performance graphene-based fiber supercapacitors.

新材料和新型储能器件开发是当前能源领域的研究热点。发展新型纤维状电极材料及其柔性储能器件是重要的研究方向，但对纤维状电极材料和柔性器件性能提出了更高的要求,如可任意弯折、可拉伸、可折叠、高储能密度等。石墨烯纤维具有独特的结构、优异的导电性、良好机械性能和电化学性质，预示着是一种极具前景、高性能的新型纤维状柔性电极材料。鉴于此，本项目拟开展石墨烯纤维的可控制备、结构调控及其在柔性超级电容器的应用关键技术研究。利用微流控芯片技术，结合湿法纺丝法制备出结构和形貌可控的、直径可调控的石墨烯及其复合纤维；利用微流控湿法纺丝技术制备一体化石墨烯（复合）纤维材料应用于新概念、柔性化（如可弯折、可拉伸、可折叠）线型超级电容器，并进行模块化、集成化研究。为宏量制备高性能石墨烯纤维状超级电容器提供科学基础。

新材料和新型储能器件开发是当前能源领域的研究热点。发展新型纤维状电极材料及其柔性储能器件是重要的研究方向，但对纤维状电极材料和柔性器件性能提出了更高的要求,如可任意弯折、可拉伸、可折叠、高储能密度等。石墨烯纤维具有独特的结构、优异的导电性、良好机械性能和电化学性质，预示着是一种极具前景、高性能的新型纤维状柔性电极材料。本项目我们提出从结构设计、不同石墨烯的组合以及纤维后处理定向拉伸来综合提升基材的机械性能。依托微流控芯片技术，通过湿法纺丝制备多种不同截面形状、多组分和多级结构的石墨烯基纤维，达到纤维的截面形状可调，直径可调，组分可调以及结构形状可调的目的；通过对纺丝液成分、凝固浴组成、绿色无毒聚电解质材料以及后续还原等处理条件的筛选组合，以期达成一步法批量化、连续化构筑绿色安全的石墨烯纤维状柔性超级电容器的最终目标，并对石墨烯纤维材料的组成和结构、电解质种类和线性电容器组装形式等与纤维状超级电容器性能之间的关系进行深入探究，为线性超级电容器未来走向实际应用提供一定的技术和理论支持。发表相关论文13篇，申请相关专利6项。

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