Abstract

The present work describes the electrochemical performance of gel polymer electrolytes containing two different sodium salts such as sodium trifluoromethanesulfonimide (NaTFSI) and sodium trifluoromethanesulfonate (NaOTF)). Poly (1-vinylpyrrolidone-co-vinyl acetate) P(VP-co-VAc) and the mixture of ethylene carbonate and propylene carbonate (EC: PC) have been employed as the host polymer and plasticizer, respectively. Through electrochemical impedance spectroscopy study, the GPE system containing 50% of NaTFSI (System 1: A5) has achieved higher ionic conductivity (1.79 × 10⁻³ S cm⁻¹) compared to the GPE system containing 50% of NaOTF (1.21 × 10⁻³ S cm⁻¹) (System 2: B5). The higher ionic conductivity of System 1: A5 was owing to the larger ionic radius of (TFSI⁻) anion. Temperature dependent studies affirmed that the ionic conductivity of all samples obeyed Arrhenius behavior. Fourier transform infrared spectroscopy revealed the formation of complex within the GPE systems which indicates the good interaction between the host polymer and the salts. X-ray diffraction analysis demonstrated the reduction in crystallinity of System 1: A5 is greater than that of System 2: B5. The maximum specific capacitance achieved by the EDLC employing System 1: A5 and System 2: B5 was 13.44 F/g (67% capacitance retention) and 13.33 F/g (4.2% capacitance retention), respectively.

中文翻译：

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用于双电层电容器（EDLC）的基于聚（1-乙烯基吡咯烷酮-乙酸乙烯酯）（PVP-co-VAc）的凝胶聚合物电解质

摘要

本工作描述了包含两种不同的钠盐（例如三氟甲磺酸钠（NaTFSI）和三氟甲磺酸钠（NaOTF））的凝胶聚合物电解质的电化学性能。聚（1-乙烯基吡咯烷酮-乙酸乙烯酯共聚物）P（VP-co-VAc）和碳酸亚乙酯和碳酸亚丙酯的混合物（EC：PC）分别用作主体聚合物和增塑剂。通过电化学阻抗谱研究，与包含50％NaOTF的GPE系统（1.21×10）相比，包含50％NaTFSI的GPE系统（系统1：A5）的离子电导率更高（1.79×10 ^-3  S cm ^-1）。⁻³  S厘米⁻¹）（系统2：B5）。系统1的更高的离子电导率：A5是由于（TFSI的较大离子半径^- ）阴离子。温度依赖性研究证实，所有样品的离子电导率均符合Arrhenius行为。傅立叶变换红外光谱揭示了在GPE系统中形成了络合物，这表明主体聚合物与盐之间具有良好的相互作用。X射线衍射分析表明，系统1：A5的结晶度降低大于系统2：B5的结晶度降低。使用系统1：A5和系统2：B5的EDLC所实现的最大比电容分别为13.44 F / g（电容保持率67％）和13.33 F / g（电容保持率4.2％）。