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Phase-Behavior-Driven Hydrogen-Bond Engineering Enables Temperature-Resilient Fibrous Zinc-Ion Batteries.

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Summary

This study introduces a novel deep-eutectic hydrogel electrolyte for fibrous energy-storage systems, enabling stable operation from -50°C to 100°C. This breakthrough enhances the temperature resilience of wearable electronics.

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adhesive interfacedeep‐eutectic hydrogel electrolytefibrous zinc‐ion batteryhydrogen‐bond engineeringtemperature resilience

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Flexible and wearable electronics require robust energy-storage components.
  • Current aqueous electrolytes and electrode interfaces limit device performance under extreme temperatures.
  • Developing temperature-resilient electrolytes is crucial for practical applications.

Purpose of the Study:

  • To design a novel deep-eutectic hydrogel electrolyte for enhanced temperature resilience in fibrous energy-storage systems.
  • To engineer the hydrogen-bond network for improved water retention and anti-freezing properties.
  • To create a stable electrolyte-electrode interface through in situ photopolymerization.

Main Methods:

  • Formulation of a deep-eutectic hydrogel electrolyte using glycerol-ethylene glycol-water system.
  • Engineering the hydrogen-bond network to control water's chemical potential and phase transitions.
  • In situ photopolymerization for conformal hydrogel coating on electrode surfaces.
  • Fabrication and testing of Zinc||Polyaniline (Zn||PANI) coin and fibrous cells.

Main Results:

  • The engineered hydrogel electrolyte suppressed ice formation at low temperatures and water volatilization at high temperatures.
  • In situ photopolymerization improved interfacial adhesion and reduced parasitic reactions.
  • Zn||PANI coin cells demonstrated stable operation from -50°C to 100°C with over 10,000 cycles.
  • Fibrous Zn||PANI cells maintained reliable cycling at -25°C for over 500 cycles.

Conclusions:

  • The deep-eutectic hydrogel electrolyte offers excellent thermodynamic and interfacial stability.
  • This strategy significantly enhances the temperature resilience of fibrous energy-storage devices.
  • The developed system shows great promise for next-generation wearable electronics.