能源化学(英文版)

能源化学(英文版) ›› 2020, Vol. 49 ›› Issue (10): 198-204.DOI: 10.1016/j.jechem.2020.02.042

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All-climate aqueous supercapacitor enabled by a deep eutectic solvent electrolyte based on salt hydrate

Xudong Bua,b, Yurong Zhangb, Yinglun Sunc, Lijun Suc, Jianing Menge, Xionggang Lua, Xingbin Yanc,d   

  1. a School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;
    b School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;
    c Laboratory of Clean Energy Chemistry and Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;
    d Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;
    e Cuiying Honors College,Lanzhou University,Lanzhou 730030,Gansu,China
  • 收稿日期:2020-01-16 修回日期:2020-02-25 出版日期:2020-10-15 发布日期:2020-12-18
  • 通讯作者: Xionggang Lu, Xingbin Yan
  • 基金资助:
    This work was financially supported by the DNL Cooperation Fund,Chinese Academy of Sciences(DNL180307)and Natural Science Foundation of Gansu Province(18JR3RA159).

All-climate aqueous supercapacitor enabled by a deep eutectic solvent electrolyte based on salt hydrate

Xudong Bua,b, Yurong Zhangb, Yinglun Sunc, Lijun Suc, Jianing Menge, Xionggang Lua, Xingbin Yanc,d   

  1. a School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;
    b School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;
    c Laboratory of Clean Energy Chemistry and Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;
    d Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;
    e Cuiying Honors College,Lanzhou University,Lanzhou 730030,Gansu,China
  • Received:2020-01-16 Revised:2020-02-25 Online:2020-10-15 Published:2020-12-18
  • Contact: Xionggang Lu, Xingbin Yan
  • Supported by:
    This work was financially supported by the DNL Cooperation Fund,Chinese Academy of Sciences(DNL180307)and Natural Science Foundation of Gansu Province(18JR3RA159).

摘要： Aqueous supercapacitors (SCs) have received considerable attention owing to the utilization of low-cost,non-flammable,and low-toxicity aqueous electrolytes thus could eliminate the safety and cost concerns,but their wide temperature range applications have generally suffered from frozen of electrolyte and insufficient ionic conductivity at low temperatures.Herein,we demonstrate the feasibility of using an unconventional Deep Eutectic Solvent (DES) based on H2O-Mg(ClO4)2·6H2O binary system as electrolyte to construct all-climate aqueous carbon-based SC.This unconventional class DES completely base on inorganic substances and achieving simply mix inexpensive salts and water together at the right proportions.Attributed to the attractive feature of extremely low freeze temperature of -69℃,this electrolyte can enable the 1.8 V carbon-based SC to fully work at -40℃ with outstanding cycling stability.This DES electrolyte comprising of a single salt and a single solvent without any additive will open up an avenue for developing simple and green electrolytes to construct all-climate SC.

关键词: Deep eutectic solvent, Salt hydrates, Aqueous supercapacitor, Aqueous electrolyte, All-climate

Abstract: Aqueous supercapacitors (SCs) have received considerable attention owing to the utilization of low-cost,non-flammable,and low-toxicity aqueous electrolytes thus could eliminate the safety and cost concerns,but their wide temperature range applications have generally suffered from frozen of electrolyte and insufficient ionic conductivity at low temperatures.Herein,we demonstrate the feasibility of using an unconventional Deep Eutectic Solvent (DES) based on H2O-Mg(ClO4)2·6H2O binary system as electrolyte to construct all-climate aqueous carbon-based SC.This unconventional class DES completely base on inorganic substances and achieving simply mix inexpensive salts and water together at the right proportions.Attributed to the attractive feature of extremely low freeze temperature of -69℃,this electrolyte can enable the 1.8 V carbon-based SC to fully work at -40℃ with outstanding cycling stability.This DES electrolyte comprising of a single salt and a single solvent without any additive will open up an avenue for developing simple and green electrolytes to construct all-climate SC.

Key words: Deep eutectic solvent, Salt hydrates, Aqueous supercapacitor, Aqueous electrolyte, All-climate