钽电解电容器用新型聚合物电极材料

【作者】 杨涛；

【导师】 蒋亚东；

【作者基本信息】 电子科技大学 ， 材料物理与化学， 2003， 硕士

【摘要】 本文以新一代导电聚合物材料3，4—聚乙烯二氧噻吩（PEDT）为研究对象，研究了EDT单体合成路线及聚合物PEDT的最佳成膜条件，并以此为基础，讨论了以导电聚合物有机材料PEDT 取代传统的无机材料MnO2作阴极的固体钽电解电容器的制备工艺及相关机理。主要研究内容包括：（1）EDT单体合成路线的两种方案，以及具体的制备过程；（2）在玻璃基片上淀积PEDT膜层，研究了聚合温度、聚合物状态、聚合改良剂、烘干温度、溶剂含量等工艺及环境条件对PEDT材料电导率和成膜速度的影响。研究发现，当溶剂的含量一定时，反应速度可以由改变单体 M与氧化剂 C的比值来进行调节，当比值越小时，反应速度变越慢。降低烘干温度有利于提高膜的致密度。聚合改良剂的加入和PEDT掺杂都明显地提高了薄膜的导电性。（3）通过对PEDT阴极被膜工艺过程的研究，找到了较适合的单体M和氧化剂C配比，清洗液的配方和清洗时间，烘干温度和时间，被膜和补形成次数等工艺参数。对比两种被膜方法，选用一步法进行实验，创新使用了真空一步法，将真空干燥与真空浸渍结合使用，最终获得比一步法更均匀、致密的阴极膜层，样品的容量引出、损耗、漏电流和ESR等电性能参数也得到提高。总之，本文以PEDT材料在固体钽电解电容器上的应用为背景，研究了其相关的机理和各种工艺条件，为有机钽电容器的研制提供了关键的先期研究基础。更多还原

【Abstract】 By examining the new generation condutive polymer material 3，4—polyethylene dioxythiophene (PEDT), this paper investigated the EDT monomer synthetic path and the optimum filming conditions of the compound PEDT. Based on this research, I also discussed the manufacturing processes and the related principles of the solid tantalum capacitors, when replacing the conventional inorganic material MnO2 with the PEDT as the negative pole. (1) Two EDT monomer synthetic paths have been investigated. (2) Using the method of depositing the PEDT film on the glass base, the affect of processing and environmental conditions --such as the polymerizing temperature, the state of the polymer material, the polymerization correctives, the drying temperature, and the amount of the solution etc. -- to the PEDT material’s electroconductivity has also been examined in this paper. (3) By exploring the filming processes of the PEDT negative pole, this paper, creatively using the vacuum single step method, has found a comparatively suitable processing condition. In conclusion, based on the application of the PEDT material on the solid tantalum capacitors, this paper has investigated their related principles and varieties of processing conditions. This has provided an essential work for the further research on the organic tantalum capacitors and its manufacturing.更多还原