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A Comb-Chain Cross-Linker-Based Network Solid Polymer Electrolyte for All-Solid-State Sodium-Metal Batteries.

William R Fullerton1, Haoruo Liu2, David N Agyeman-Budu3

  • 1Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.

ACS Applied Energy Materials
|September 26, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel solid polymer electrolyte (SPE) for safer, all-solid-state sodium-metal batteries (SMBs). The new SPE demonstrates exceptional mechanical strength and dendrite resistance, achieving record-breaking performance in battery cycling.

Keywords:
network polymer catholytesnetwork solid polymer electrolytessodium-metal batteriessolid polymer electrolytessolid-state batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • All-solid-state sodium-metal batteries (SMBs) offer enhanced safety and sustainability over lithium-ion alternatives.
  • Sodium metal's high reactivity leads to dendrite formation, hindering SMB performance and safety.
  • Solid polymer electrolytes (SPEs) are crucial for developing safe and efficient all-solid-state batteries.

Purpose of the Study:

  • To develop a robust and high-performance SPE for all-solid-state SMBs.
  • To address the challenges of sodium dendrite growth and improve battery cycling stability.
  • To investigate the relationship between the mechanical properties of SPEs and their electrochemical performance.

Main Methods:

  • Synthesized a novel comb-chain cross-linker-based network SPE.
  • Characterized the mechanical properties, including elongation at break and toughness.
  • Evaluated ionic conductivity and electrochemical performance in Na|SPE|Na symmetric cells and full cells with a P2-type cathode.

Main Results:

  • The SPE exhibited excellent mechanical properties: 181% elongation at break and 1.6 MJ m-3 toughness.
  • Achieved remarkable cycle life of ~4248 h in symmetric cells at 0.5 mA cm-2.
  • Full cells retained 80.6% capacity after 700 cycles at 1C, setting new records for SPE-based all-solid-state SMBs.

Conclusions:

  • The developed SPE demonstrates superior mechanical and electrochemical properties for all-solid-state SMBs.
  • The comb-chain cross-linker network effectively suppresses sodium dendrite formation.
  • This work paves the way for safer, high-performance, and sustainable sodium-metal batteries.