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Low Temperature Tolerant Organohydrogel Electrolytes for Flexible Solid-State Supercapacitors

机译：柔性固态超级电容器的耐低温有机水凝胶电解质

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摘要

Gel electrolytes are attracting growing interest in the field of flexible solid supercapacitors. So far, hydrogel electrolytes have been widely investigated, and high performance flexible supercapacitors based on these electrolytes have been realized. However, conventional hydrogel electrolytes contain massive solvent water, inevitably freeze and restrict ion transport at subzero temperatures, which fundamentally limits the utilization of supercapacitors in extreme low temperatures. A new organohydrogel electrolyte that successfully brings the advantages of outstanding flexibility and ionic conductivity at low temperatures by using H2O/ethylene glycol as a dispersion medium is reported here. When applying the antifreezing organohydrogel electrolyte, the flexible solid supercapacitor with carbon nanotube paper electrodes (approximate to 0.5 x 2.2 cm(2)) exhibits stable electrochemical performance (70.6% capacitance retained at -40 degrees C) and excellent cycling stability (only 11.7% capacitance decay over 5000 charge/discharge cycles at -20 degrees C.) at low temperatures, representing the excellent low temperature tolerance. Meanwhile, the supercapacitor devices offer remarkable flexible performance under consecutive bending conditions. It is anticipated that the low temperature tolerant organohydrogel electrolyte may be a promising gel electrolyte for the next generation of flexible solid supercapacitors for using at low temperature environments.
机译：凝胶电解质在柔性固体超级电容器领域引起了越来越多的兴趣。迄今为止，水凝胶电解质已被广泛研究，并且已经实现了基于这些电解质的高性能柔性超级电容器。然而，常规的水凝胶电解质包含大量的溶剂水，不可避免地会在低于零温度的温度下冻结并限制离子的迁移，这从根本上限制了超级电容器在极端低温下的使用。本文报道了一种新的有机水凝胶电解质，该电解质通过使用H2O /乙二醇作为分散介质成功地在低温下带来了出色的柔韧性和离子电导率的优势。当使用防冻有机水凝胶电解质时，带有碳纳米管纸电极（约0.5 x 2.2 cm（2））的柔性固体超级电容器表现出稳定的电化学性能（在-40摄氏度时保持70.6％的电容）和出色的循环稳定性（仅11.7％）在低温下，在-20摄氏度下，经过5000个充电/放电循环后，电容衰减了，代表了出色的低温耐受性。同时，超级电容器器件在连续弯曲条件下具有出色的柔性性能。预期耐低温有机水凝胶电解质可能是用于在低温环境下使用的下一代柔性固体超级电容器的有前途的凝胶电解质。

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  • 来源
    《Advanced energy materials》 |2018年第31期|1801967.1-1801967.7|共7页
  • 作者

    Rong Qinfeng; Lei Wenwei; Huang Jin; Liu Mingjie;

  • 作者单位

    Beihang Univ, Sch Chem, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100191, Peoples R China;

    Beihang Univ, Sch Chem, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100191, Peoples R China;

    Beihang Univ, Sch Chem, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100191, Peoples R China;

    Beihang Univ, Sch Chem, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100191, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    flexible supercapacitors; gel electrolytes; low temperature tolerance; organohydrogel; solid-state devices;

    机译：柔性超级电容器;凝胶电解质;耐低温性;有机水凝胶;固态器件;

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