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Leveraging cation effect for low temperature aqueous Zn-based batteries.

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Summary

Aluminum ions (Al3+) significantly lower the freezing point of aqueous electrolytes to -117 °C by weakening water hydrogen bonds. This cation effect also enhances battery performance at low temperatures.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Anion-water interactions are known to lower freezing points in electrolytes.
  • Cation-water interactions have been largely overlooked in antifreezing applications.
  • Understanding cation effects is crucial for developing low-temperature aqueous devices.

Purpose of the Study:

  • To investigate the impact of cation-water interactions on electrolyte freezing points.
  • To explore the role of aluminum ions (Al3+) in modifying water structure and hydrogen bonding.
  • To demonstrate the application of cation-engineered electrolytes in high-performance low-temperature batteries.

Main Methods:

  • Investigated Al3+ cation effects on water structure and hydrogen bonding in aqueous electrolytes.
  • Measured freezing point depression using Al3+-containing electrolytes.
  • Fabricated and tested zinc-based symmetrical coin cells and zinc-polyaniline pouch cells at low temperatures.

Main Results:

  • Al3+ weakens water hydrogen bonds, significantly lowering the freezing point to -117 °C at 2.8 m concentration.
  • Dual-cation effects optimized ion diffusion and formed a protective Al-Zn alloy layer on the Zn electrode.
  • Symmetrical Zn||Zn cells achieved 10,340 hours of stable Zn plating/stripping.
  • Zn||polyaniline pouch cells showed 100% capacity retention after 500 cycles at -70 °C and delivered 115.5 mAh g-1 at -80 °C.

Conclusions:

  • Cation effects, specifically from Al3+, are a powerful strategy for tuning water structure in electrolytes.
  • This approach enables the development of highly stable and efficient aqueous electrolytes for low-temperature energy storage devices.
  • The findings open new avenues for designing advanced electrolytes for extreme condition applications.