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<p>Polymer electrolytes based on poly (ethylene oxide) (PEO) show significant potential for use in all solid-state lithium metal batteries. Improving the ionic conductivity, broaden the electrochemical stability window and flame retardant property of solid polymer electrolytes (SPEs) is vital for developing safer, higher-energy–density batteries. This paper introduces an innovative flame retardant strategy based on the unique chemical structure of phosphonitrile fluoride, by incorporating ethoxy pentafluorocyclotriphosphonitrile (PFPN) as a functional additive, the strategy not only reduces PEO crystallinity and improves electrochemical performance at quasi-room temperature but also enhances oxidation resistance and widens the electrochemical window. Additionally, PFPN confers flame retardant properties to PEO, thereby enhancing battery safety and facilitating the creation of a high-performance polymer solid electrolyte. The optimized solid-state electrolyte exhibited an ionic conductivity of 8.2 × 10<sup>–4</sup> S cm<sup>−1</sup> at 60&#xa0;°C. The electrochemical window was expanded to 5.1&#xa0;V, and the LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>/FNOP-10/Li cell maintained a capacity of 123 mAh g<sup>−1</sup> after 100 cycles at 0.2C at 60&#xa0;°C. And the Li/FNOP-10/Li cell was able to cycle stably for more than 1400&#xa0;h at a current density of 0.1&#xa0;mA&#xa0;cm<sup>−2</sup>, and no short-circuiting caused by lithium dendrites was observed. These results demonstrate that the proposed method significantly enhances the overall performance of the electrolyte.</p> Graphical abstract <p></p>

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Construction of high safety and stability polymer solid electrolytes for lithium metal batteries via a multifunctional group synergistic mechanism

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Yong-Qi Wang,
  • Zhao-Jun Chen,
  • Liang Shan,
  • Rong-Wei Huang,
  • Zi-Yi Zhu,
  • Jun-Qiao Ding,
  • Ji-Yue Hou,
  • Yi-Yong Zhang,
  • Xue Li

摘要

Polymer electrolytes based on poly (ethylene oxide) (PEO) show significant potential for use in all solid-state lithium metal batteries. Improving the ionic conductivity, broaden the electrochemical stability window and flame retardant property of solid polymer electrolytes (SPEs) is vital for developing safer, higher-energy–density batteries. This paper introduces an innovative flame retardant strategy based on the unique chemical structure of phosphonitrile fluoride, by incorporating ethoxy pentafluorocyclotriphosphonitrile (PFPN) as a functional additive, the strategy not only reduces PEO crystallinity and improves electrochemical performance at quasi-room temperature but also enhances oxidation resistance and widens the electrochemical window. Additionally, PFPN confers flame retardant properties to PEO, thereby enhancing battery safety and facilitating the creation of a high-performance polymer solid electrolyte. The optimized solid-state electrolyte exhibited an ionic conductivity of 8.2 × 10–4 S cm−1 at 60 °C. The electrochemical window was expanded to 5.1 V, and the LiNi0.8Co0.1Mn0.1O2/FNOP-10/Li cell maintained a capacity of 123 mAh g−1 after 100 cycles at 0.2C at 60 °C. And the Li/FNOP-10/Li cell was able to cycle stably for more than 1400 h at a current density of 0.1 mA cm−2, and no short-circuiting caused by lithium dendrites was observed. These results demonstrate that the proposed method significantly enhances the overall performance of the electrolyte.

Graphical abstract