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<p>Ceramic-gel composite electrolytes (CGEs) attract significant attention as solid-state electrolytes (SSEs) for sodium metal batteries owing to their favorable ionic conductivity and interfacial compatibility. However, conventional CGEs generally feature insufficient mechanical strength and consequent uncontrollable dendrite growth, remaining long-standing fundamental challenges that severely limit practical applications. Herein, this study presents a high-strength CGE that enables efficient stress transfer, achieving a compressive strength of 20.1&#xa0;MPa (20 times higher than conventional gel electrolytes), while maintaining excellent ionic conductivity and effectively suppressing sodium dendrites. The 3D-Na<sub>3</sub>Zr<sub>2</sub>Si<sub>2</sub>PO<sub>12</sub> framework further serves as a thermal barrier, imparting the CGE with superior flame retardancy. Additionally, Na/CGE/NVP-K<sub>0.05</sub> cells exhibit 75.9% capacity retention after 10,000 cycles at 5C (25&#xa0;°C) and deliver 78.5 mAh g<sup>−1</sup> at 30C (60&#xa0;°C). Remarkably, the CGE exhibits excellent low-temperature adaptability, retaining nearly 100% capacity at –20&#xa0;°C. These results highlight a viable strategy for designing safe and high-performance solid-state sodium metal batteries toward practical deployment. </p>

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High-Strength 3D-Ordered Ceramic-Gel Composite Electrolytes Enable Highly Stable Sodium Metal Batteries at − 20 to 60 °C

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月4日

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  • Liying Shen,
  • Chuyan Hu,
  • Zhenhui Huang,
  • Jiarui Yang,
  • Yanwei Jia,
  • Yufeng Zhao,
  • Rüdiger Berger,
  • Qiang Liu,
  • Yu Zhou

摘要

Ceramic-gel composite electrolytes (CGEs) attract significant attention as solid-state electrolytes (SSEs) for sodium metal batteries owing to their favorable ionic conductivity and interfacial compatibility. However, conventional CGEs generally feature insufficient mechanical strength and consequent uncontrollable dendrite growth, remaining long-standing fundamental challenges that severely limit practical applications. Herein, this study presents a high-strength CGE that enables efficient stress transfer, achieving a compressive strength of 20.1 MPa (20 times higher than conventional gel electrolytes), while maintaining excellent ionic conductivity and effectively suppressing sodium dendrites. The 3D-Na3Zr2Si2PO12 framework further serves as a thermal barrier, imparting the CGE with superior flame retardancy. Additionally, Na/CGE/NVP-K0.05 cells exhibit 75.9% capacity retention after 10,000 cycles at 5C (25 °C) and deliver 78.5 mAh g−1 at 30C (60 °C). Remarkably, the CGE exhibits excellent low-temperature adaptability, retaining nearly 100% capacity at –20 °C. These results highlight a viable strategy for designing safe and high-performance solid-state sodium metal batteries toward practical deployment.