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<p>A key advancement in emerging sodium-ion batteries is the integration of gel polymer electrolytes, which offer improved performance, scalability, and safety. Here, we report a series of sodium-ion–conducting gel polymer electrolytes synthesized via acrylate-based polymerization incorporating a phosphate linker to enhance both electrochemical stability and thermal runaway resistance. Full cells incorporating gel polymer electrolytes derived from triacrylate polymerization with phosphate linkers deliver an average discharge voltage of 2.7 V (projected specific energy of ~160 Wh kg⁻¹) and maintain &gt;95% up to 100 cycles and &gt;80% up to 500 cycles at C/5. In addition, the phosphate linker substantially improves safety, reducing the self-extinguishing time (flammability index: 14.83 s g⁻¹) and effectively preventing thermal runaway under severe overcharge conditions.</p>

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Safe and high-performance sodium-ion batteries powered by thermally-cured gel polymer electrolytes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月6日

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  • Spencer A. Langevin,
  • Courtney McHale,
  • Tanner Hamann,
  • Ann Choi,
  • Lingyu Zhang,
  • Yayuan Liu,
  • Jesse S. Ko

摘要

A key advancement in emerging sodium-ion batteries is the integration of gel polymer electrolytes, which offer improved performance, scalability, and safety. Here, we report a series of sodium-ion–conducting gel polymer electrolytes synthesized via acrylate-based polymerization incorporating a phosphate linker to enhance both electrochemical stability and thermal runaway resistance. Full cells incorporating gel polymer electrolytes derived from triacrylate polymerization with phosphate linkers deliver an average discharge voltage of 2.7 V (projected specific energy of ~160 Wh kg⁻¹) and maintain >95% up to 100 cycles and >80% up to 500 cycles at C/5. In addition, the phosphate linker substantially improves safety, reducing the self-extinguishing time (flammability index: 14.83 s g⁻¹) and effectively preventing thermal runaway under severe overcharge conditions.