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Self-Healable and Cold-Resistant Supercapacitor Based on a Multifunctional Hydrogel Electrolyte.

Feng Tao1, Liming Qin1, Zhikui Wang1

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This study presents a self-healable hydrogel electrolyte for energy storage. The novel material offers excellent cold resistance and ionic conduction, enabling robust performance in wearable devices.

Keywords:
cold resistancedynamic catechol−borate bondingmultifunctional hydrogel electrolyteself-healable supercapacitorsodium alginate

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Portable and wearable energy storage devices require self-healability and cold resistance.
  • Achieving these properties necessitates self-healable electrolytes with high low-temperature ionic conduction.

Purpose of the Study:

  • To develop a hydrogel electrolyte with intrinsic self-healability and excellent cold resistance.
  • To investigate the potential of this hydrogel electrolyte in energy storage applications.

Main Methods:

  • Synthesized a hydrogel electrolyte using sodium alginate cross-linked by dynamic catechol-borate ester bonding.
  • Incorporated high concentrations of inorganic salts into the dynamically cross-linked alginate network.
  • Fabricated and tested a supercapacitor utilizing the developed hydrogel electrolyte.

Main Results:

  • The hydrogel electrolyte demonstrated excellent self-healing efficiency and cyclability.
  • The electrolyte maintained high ionic conduction at both room temperature and low temperatures.
  • A supercapacitor using the hydrogel electrolyte fully recovered capacitance after 10 breaking/healing cycles and retained 80% capacitance at -10 °C.

Conclusions:

  • The developed hydrogel electrolyte offers a promising strategy for creating self-healable and cold-resistant energy storage devices.
  • This technology has potential applications in wearable electronics, intelligent apparel, and flexible robotics.
  • The dynamic catechol-borate ester bonding in the alginate network is key to achieving multifunctional properties.