自由基聚合物功能化石墨烯的合成及相关问题研究

项目名称： 自由基聚合物功能化石墨烯的合成及相关问题研究

项目编号： No.21204098

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 高分子科学

项目作者： 李永军

作者单位： 中国科学院上海有机化学研究所

项目金额： 25万元

中文摘要： 信息及光电等领域对于柔性二次电池的需求已越来越多，而传统的电极材料已不能满足高性能柔性二次电池的需求。自由基聚合物因其电化学稳定、迅速可逆的充放电性能和电极电势可调等特点近年来受到很大关注，有望成为新一代高容量兼高功率电池材料。但是自由基聚合物导电性低，在制备电极时需加入大量的石墨(80 wt%)作为导电剂，因此降低了电池的能量密度。通过共价键将自由基聚合物与具有优良电学和力学性能的石墨烯相结合，有助于提高基于自由基聚合物电极材料的导电率。然而自由基单体结构特殊，常用的基于活性自由基聚合的接枝方法已不适于自由基聚合物功能化石墨烯的制备，因此我们需要发展新的制备方法，制备自由基聚合物功能化的石墨烯，研究自由基聚合物的单体类型、接枝方法和石墨烯的尺寸、表面化学等因素对自由基聚合物在石墨烯表面接枝密度的影响，解决与自由基聚合物功能化石墨烯制备相关的问题。

中文关键词： 复合材料；石墨烯；聚合物；阳极材料；合成

英文摘要： There is an increasingly demand for flexible secondary batteries from the fields including information technology and optoelectronics etc. The conventional electrode-active materials such as metal oxides and conductive polymers, however, can hardly meet the demand of flexible electrodes. Recently, stable radical polymers have been attracted much more attentions and considered as candidates for electrode materials with high energy density and power capability because of their chemical stability, reversible electrochemical behavior, fast charge-discharge performance, and tunable redox potential via diverse organic substituents. Nevertheless, due to their low electrical conductivity, radical polymers must be mixed with a large amount of graphite (up to 80 wt%) to increase the electrical conductivity of electrodes while lowering the energy capacity of batteries. In order to elevate the electrical conductivity of radical-polymer-based electrode materials, we propose to integrate electrode-active radical polymers and graphene with excellent electrical and mechanical properties via covalent bonds to synthesize radical-polymer-functionalized graphene sheets. But, because of the distinctive structure of robust radical-bearing monomers (or the precursors with free amine group), it is still a challenging mission to apply

英文关键词： composite material；graphene；polymer；cathode material；syntheisis