High Performance Solid Polymer Electrolytes for Rechargeable Batteries: A Self-Catalyzed Strategy toward Facile...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• High-performance solid polymer electrolytes (SPEs) are crucial for advanced energy storage solutions.
• Current synthesis methods for SPEs often involve complex chemistries and processes.
• Lithium salts stabilized by Lewis acids can initiate ring-opening polymerization.

Purpose of the Study:

• To develop a facile and efficient self-catalyzed strategy for synthesizing crosslinked poly(ethylene glycol) diglycidyl ether-based solid polymer electrolytes (C-PEGDE).
• To evaluate the electrochemical properties and performance of the synthesized C-PEGDE in lithium-ion batteries.

Main Methods:

• A self-catalyzed ring-opening polymerization strategy was employed.
• Crosslinked poly(ethylene glycol) diglycidyl ether (C-PEGDE) was synthesized.
• Electrochemical stability window, ionic conductivity, and battery performance (charge/discharge profiles, rate capability) were assessed.

Main Results:

• The synthesized C-PEGDE demonstrated a superior electrochemical stability window of up to 4.5 V vs. Li/Li⁺.
• An ionic conductivity of 8.9 × 10^-5 S cm^-1 was achieved at ambient temperature.
• LiFePO₄/C-PEGDE/Li batteries exhibited stable charge/discharge profiles and good rate capability.

Conclusions:

• The self-catalyzed strategy provides an effective approach for facile synthesis of high-performance solid polymer electrolytes.
• C-PEGDE shows significant potential for use in stable and efficient lithium-ion batteries.
• This method offers a promising route towards scalable production of advanced SPEs.