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首页> 外文期刊>Physical chemistry chemical physics: PCCP >The impact of carbonate solvents on the self-discharge, thermal stability and performance retention of high voltage electrochemical double layer capacitors
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The impact of carbonate solvents on the self-discharge, thermal stability and performance retention of high voltage electrochemical double layer capacitors

机译:碳酸盐溶剂对高压电化学双层电容器的自放电,热稳定性和性能保持的影响

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摘要

Advanced electrolytes for supercapacitors with high electrochemical stability are necessary to improve the suitability of supercapacitors for many applications. In this work we investigated electrolytes based on the solvent propylene carbonate (PC) and butylene carbonate (BC). A comparison of different solvent-salt combinations shows that 1 M N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr(14)TFSI) in BC is superior to conventionally used PC-based electrolytes examined in this work in terms of voltage window and capacitance. In order to gain a better understanding of the influence of the ions and the solvent on the formation of the electrochemical double layer, the self-discharge mechanism and its temperature dependence have been investigated in detail. By coupling thermogravimetry (TGA), infrared spectroscopy (IR), gas chromatography and mass spectrometry (GC-MS), also decomposition and temperature stability have been assessed.
机译:具有高电化学稳定性的超级电容器的高级电解质是提高超级电容器对许多应用的适用性。 在这项工作中,我们基于溶剂丙烯碳酸酯(PC)和碳酸丁酯(BC)来研究电解质。 不同溶剂组合的比较表明,BC中的1M正丁基-N-甲基吡咯烷鎓双(三氟甲基磺酰基)酰亚胺(三氟甲磺酰基)酰亚胺(Pyr甲磺酰基)酰亚胺(Pyr(14)TFSI)优于在电压方面在这项工作中检查的常规使用的基于PC的电解质 窗口和电容。 为了更好地理解离子和溶剂对电化学双层的形成,已经详细研究了自放电机构及其温度依赖性。 通过耦合热重量法(TGA),红外光谱(IR),气相色谱和质谱(GC-MS),还评估了分解和温度稳定性。

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    Friedrich Schiller Univ Jena Inst Tech &

    Environm Chem ITUC Philosophenweg 7a D-07743 Jena Germany;

    Friedrich Schiller Univ Jena Inst Tech &

    Environm Chem ITUC Philosophenweg 7a D-07743 Jena Germany;

    Friedrich Schiller Univ Jena Inst Tech &

    Environm Chem ITUC Philosophenweg 7a D-07743 Jena Germany;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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