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Snehashis Choudhury1, Zhengyuan Tu2, A Nijamudheen3,4,5,6,7

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Cationic chain transfer agents prevent ether electrolyte degradation in lithium-ion batteries. This breakthrough enables stable, high-energy solid-state batteries using advanced cathode chemistries.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Lithium and sodium anodes are key for high-energy batteries.
  • Ether-based polymer electrolytes are promising but face degradation issues.
  • Anionic polymerization and oxidative degradation limit current polymer electrolyte applications to low-voltage cathodes.

Purpose of the Study:

  • To overcome ether electrolyte degradation challenges in rechargeable batteries.
  • To enable the use of high-voltage cathodes with polymer electrolytes.
  • To advance the development of stable, high-energy solid-state and flexible batteries.

Main Methods:

  • Utilized cationic chain transfer agents to inhibit uncontrolled anionic polymerization at the anode.
  • Developed cathode electrolyte interphases using preformed anionic polymers and supramolecules.
  • Investigated the electrochemical stability of ether-based electrolytes at high potentials.

Main Results:

  • Cationic chain transfer agents effectively prevented ether electrolyte degradation at the anode.
  • Preformed cathode electrolyte interphases significantly enhanced electrolyte stability at high voltages.
  • Demonstrated the potential for ether-based electrolytes to operate beyond conventionally accepted voltage limits.

Conclusions:

  • This study presents a novel strategy to stabilize ether-based electrolytes for advanced battery applications.
  • The findings pave the way for developing high-energy, stable solid-state and flexible batteries.
  • Overcoming electrolyte degradation is crucial for unlocking the full potential of next-generation energy storage.