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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Polyimide-Based Aqueous Potassium Energy Storage Systems Using Concentrated WiSE Electrolyte.

Gudla Vardhini1, Patoju Sai Dilip2, Sreelakshmi Anil Kumar1

  • 1School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Maruthamala PO, Vithura, Kerala 695551, India.

ACS Applied Materials & Interfaces
|January 2, 2024
PubMed
Summary

This study introduces PDI-Urea as a novel anode for aqueous potassium batteries, demonstrating excellent performance and stability in superconcentrated electrolytes for sustainable energy storage.

Keywords:
Aqueous Potassium ion batteryAqueous potassium dual ion batteryOrganic electrodePolyimideWiSE electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Aqueous batteries offer eco-friendly, cost-effective, and nonflammable energy storage solutions.
  • Organic electrode materials enhance sustainability and tunability in battery systems.
  • Superconcentrated electrolytes (WiSE) widen the electrochemical stability window of aqueous batteries.

Purpose of the Study:

  • To introduce PDI-Urea as a novel anode material for aqueous potassium energy storage.
  • To evaluate the electrochemical performance of PDI-Urea in various water-in-salt electrolytes.
  • To assess the viability of PDI-Urea in full cell configurations like aqueous potassium dual-ion batteries and K-ion batteries.

Main Methods:

  • Electrochemical performance testing of PDI-Urea anode in three WiSE electrolytes (potassium acetate, potassium formate, KFSI).
  • Fabrication and testing of full cell devices (APDIB and AKIB) using PDI-Urea anode and a PBA cathode in KFSI electrolyte.
  • Mechanism analysis using ex-situ studies.

Main Results:

  • The PDI-Urea anode demonstrated good electrochemical performance in WiSE.
  • The full cell K-ion battery (PDI-Urea anode/PBA cathode) exhibited a capacity retention of 91% over 1000 cycles.
  • The study systematically analyzed the electrode reaction mechanisms.

Conclusions:

  • PDI-Urea is a promising anode material for aqueous potassium energy storage systems.
  • Superconcentrated electrolytes significantly enhance the performance of aqueous potassium batteries.
  • The developed aqueous potassium-ion battery shows excellent cycling stability and potential for practical applications.