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Related Experiment Video

Updated: Sep 16, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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A Homogeneous Hexagonal-Structured Polymer Electrolyte Framework for High-Performance Polymer-Based Lithium Batteries

Seungjin Lee1, Changseong Kim1, Suyeon Kim1

  • 1Department of Advanced Battery Convergence Engineering, Dongguk University, Seoul 04620, Republic of Korea.

Polymers
|July 12, 2025
PubMed
Summary

This study introduces a hexagonal-structure gel polymer electrolyte (h-SICGPE) for lithium batteries, enhancing conductivity and stability at room temperature. The novel framework offers superior performance for next-generation polymer-based batteries.

Keywords:
anion receptor additiveelectrochemical stabilitygel polymer electrolyteslithium-ion transference numberpolymer electrolytespolymer-based batterysingle-ion conducting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Polymer electrolytes (PEs) in lithium batteries suffer from low ionic conductivity at room temperature (25 °C).
  • This limitation hinders the practical application of polymer-based batteries at ambient conditions.

Purpose of the Study:

  • To develop a novel single-ion conducting gel polymer electrolyte (h-SICGPE) with enhanced ionic conductivity and electrochemical stability at 25 °C.
  • To create a robust, cross-linked polymer network with a hexagonal structure for improved battery performance.

Main Methods:

  • Fabrication of a hexagonal-structure-based single-ion conducting gel polymer electrolyte (h-SICGPE) using trimethylolpropane tris(3-mercaptopropionate) and poly(ethylene glycol) diacrylate.
  • Incorporation of anion receptors within a cross-linked polymer network to form a honeycomb structure.
  • Characterization of ionic conductivity, electrochemical stability, and battery performance at 25 °C.

Main Results:

  • The h-SICGPE achieved an ionic conductivity of 2.46 mS cm⁻¹ at 25 °C.
  • Demonstrated excellent oxidative stability (4.9 V vs. Li/Li⁺), high coulombic efficiency (97.65%), and capacity retention (88.3%).
  • The hexagonal structure and anion receptors effectively suppressed crystallinity and increased free volume, enhancing Li⁺ transport.

Conclusions:

  • The developed h-SICGPE offers a promising solution for high-performance polymer-based lithium batteries operable at room temperature.
  • The unique structural design significantly improves ionic conductivity and electrochemical properties compared to conventional polymer electrolytes.