Solid state double layer capacitor based on a polyether polymer electrolyte blend and nanostructured carbon black electrode composites
Solid state double layer capacitor based on a polyether polymer electrolyte blend and nanostructured carbon black electrode composites
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DOI：
10.1016/j.jpowsour.2007.11.060
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发表时间：
2008-03
影响因子：
9.2
通讯作者：
R. Lavall;R. S. Borges;H. Calado;C. Welter;J. Trigueiro;J. Rieumont;B. Neves;G. Silva
中科院分区：
文献类型：
--
作者：
R. Lavall;R. S. Borges;H. Calado;C. Welter;J. Trigueiro;J. Rieumont;B. Neves;G. Silva
以聚氧乙烷/聚丙二醇-b-聚乙二醇-b-聚丙二醇双(2-氨基丙基醚)共混物(PEO-NPPP)和LiClO4为聚合物电解层，以PEO-NPPP-炭黑(CB)为电极膜，组装了全固态双电层电容器。采用了高相对分子质量的PEO和相对分子质量为2000Da的嵌段共聚物NPPP，从溶剂或增塑剂泄漏的角度来看，设计是安全的，因此不需要分离器。将高导电性、大比表面积的纳米结构炭黑分散在聚合物共混物中制备电极复合材料。用差示扫描量热法、原子力显微镜(AFM)和交流阻抗谱对喷雾法制备的电解液和电极多层膜进行了研究。离子电导率随温度的变化符合Williams-Landel-Ferry方程，这表明固体聚合物电解质具有典型的导电机理。纳米复合电极的AFM图像显示，尺寸约为60 nm的碳黑颗粒均匀分布在半结晶和多孔聚合物共混涂层中。含10wt.%CB的固体双层电容器的最终厚度约为130fgμm，容量为17fg−1，循环能力超过1,000次。这些特性使得在全固态下构建微型器件成为可能，它将避免电解液泄漏，并具有优于文献中提出的其他类似双电层电容器(EDLC)的性能，如用总碳质量评估的比电容。
An all solid double layer capacitor was assembled by using poly(ethylene oxide)/poly(propylene glycol)-b-poly(ethylene glycol)-b-poly(propylene glycol)-bis(2-aminopropyl ether) blend (PEO-NPPP) and LiClO4as polymer electrolyte layer and PEO-NPPP–carbon black (CB) as electrode film. High molecular weight PEO and the block copolymer NPPP with molecular mass of 2000Da were employed, which means that the design is safe from the point of view of solvent or plasticizer leakage and thus, a separator is not necessary. Highly conductive with large surface area nanostructured carbon black was dispersed in the polymer blend to produce the electrode composite. The electrolyte and electrode multilayers prepared by spray were studied by differential scanning calorimetry, atomic force microscopy (AFM) and impedance spectroscopy. The ionic conductivity as a function of temperature was fitted with the Williams–Landel–Ferry equation, which indicates a conductivity mechanism typical of solid polymer electrolyte. AFM images of the nanocomposite electrode showed carbon black particles of approximately 60nm in size well distributed in a semicrystalline and porous polymer blend coating. The solid double layer capacitor with 10wt.% CB was designed with final thickness of approximately 130μm and delivered a capacitance of 17Fg−1with a cyclability of more than 1000 cycles. These characteristics make possible the construction of a miniature device in complete solid state which will avoid electrolyte leakage and present a performance superior to other similar electric double layer capacitors (EDLCs) presented in literature, as assessed in specific capacitance by total carbon mass.