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A Fast Na-Ion Conduction Polymer Electrolyte via Triangular Synergy Strategy for Quasi-Solid-State Batteries.

Jun Luo1, Mingrui Yang1, Denghui Wang1

  • 1College of Chemistry & Green Catalysis Center, Zhengzhou University, Zhengzhou, 450001, Henan, P. R. China.

Angewandte Chemie (International Ed. in English)
|November 14, 2023
PubMed
Summary

This study introduces a novel strategy using polymer-salt, ionic liquid, and an additive to enhance sodium-ion (Na+) conduction in polymer electrolytes for safer batteries. The approach significantly improves ionic conductivity and battery performance at room temperature.

Keywords:
ElectrochemistryIonic ConductivityPolymer ElectrolyteSodium-Ion BatterySolid-State Battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Polymer electrolytes offer high safety and processability for quasi-solid-state batteries.
  • Sluggish ion transfer at room temperature hinders their widespread application.

Purpose of the Study:

  • To accelerate sodium-ion (Na+) conduction in polymer electrolytes.
  • To develop high-performance and safe quasi-solid-state batteries.

Main Methods:

  • A triangular synergy strategy combining polymer-salt (PVDF-HFP/NaTFSI), ionic liquid (EmimFSI), and an electron-rich additive (Nerolin).
  • Physicochemical characterizations and theoretical calculations to analyze ion transport mechanisms.
  • Fabrication and testing of quasi-solid-state battery cells.

Main Results:

  • The strategy significantly enhanced Na+ conduction by weakening polymer chain interactions and creating additional ion pathways.
  • Electron-rich Nerolin facilitated NaTFSI dissociation and restrained cation migration, lowering the energy barrier for ion transport.
  • Achieved high ionic conductivity (1.37×10⁻³ S cm⁻¹) and sodium-ion transference number (tNa+ = 0.79) at 25°C.
  • Demonstrated reliable rate capability and stability (200 cycles, 99.2% capacity retention at 0.5 C) with enhanced safety.

Conclusions:

  • The proposed triangular synergy strategy effectively accelerates ion transport in polymer electrolytes.
  • This approach leads to high-performance, safe quasi-solid-state batteries with improved ionic conductivity and stability.