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<p>Construction of fast ion-conduction channels is of great significance for the performance breakthrough of Li<sup>+</sup> solid state electrolytes (LiSSE). It not only can significantly improve target ion transfer, but also enhance the Li<sup>+</sup> migration number. This study reports a new type of solid electrolyte of metal-organic framework (MOF) covalently modified by Li<sup>+</sup> ionic liquids derived from zwitterion APS group, namely UiO-66-APS⋅xLiTFSI (zwitterion APS = amino-1-propane sulfonate, LiTFSI = bis (trifluoromethane) sulfonimide lithium salt). Wherein, the Li<sup>+</sup> ionic liquid moiety (APS⋅xLiTFSI) is confined and arranged along the order channel (&lt; 1&#xa0;nm) within the framework of UiO-66 via covalent-bonded APS, leading to infinite paths and abundant lithium ion hopping sites for fast Li<sup>+</sup> transmission. The enhancement of the Li<sup>+</sup> conduction of UiO-66-APS⋅2.7LiTFSI is over 2 orders magnitude higher than that of the counterpart H<sub>2</sub>BDC-APS⋅2.7LiTFSI ionic liquid within a wide temperature range. This material exhibits excellent ionic conductivity, with the conductivity of 3.5 × 10⁻⁴ S cm⁻¹ and a lithium-ion transference number (tLi⁺) of 0.83 at room-temperature. The conductivity follows an Arrhenius-type temperature dependence, increasing linearly with temperature to reach 1.33 × 10⁻² S cm⁻¹ at 100&#xa0;°C. Structure and component effect on the new type of LiSSEs are investigated and fully characterized, and the features of non-flammability, non-leakage of high safety with high conduction are discussed.</p>

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Synthesis and Li+ conduction study of solid ionic liquids derived from Zwitterion modified metal-organic framework (MOF)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月18日

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  • Fei Chen,
  • Li Ming Chen,
  • Jia Li Chen,
  • Wen Yue You,
  • Xiang Kun Cui,
  • Yu Heng Deng,
  • Chong-Qing Wan

摘要

Construction of fast ion-conduction channels is of great significance for the performance breakthrough of Li+ solid state electrolytes (LiSSE). It not only can significantly improve target ion transfer, but also enhance the Li+ migration number. This study reports a new type of solid electrolyte of metal-organic framework (MOF) covalently modified by Li+ ionic liquids derived from zwitterion APS group, namely UiO-66-APS⋅xLiTFSI (zwitterion APS = amino-1-propane sulfonate, LiTFSI = bis (trifluoromethane) sulfonimide lithium salt). Wherein, the Li+ ionic liquid moiety (APS⋅xLiTFSI) is confined and arranged along the order channel (< 1 nm) within the framework of UiO-66 via covalent-bonded APS, leading to infinite paths and abundant lithium ion hopping sites for fast Li+ transmission. The enhancement of the Li+ conduction of UiO-66-APS⋅2.7LiTFSI is over 2 orders magnitude higher than that of the counterpart H2BDC-APS⋅2.7LiTFSI ionic liquid within a wide temperature range. This material exhibits excellent ionic conductivity, with the conductivity of 3.5 × 10⁻⁴ S cm⁻¹ and a lithium-ion transference number (tLi⁺) of 0.83 at room-temperature. The conductivity follows an Arrhenius-type temperature dependence, increasing linearly with temperature to reach 1.33 × 10⁻² S cm⁻¹ at 100 °C. Structure and component effect on the new type of LiSSEs are investigated and fully characterized, and the features of non-flammability, non-leakage of high safety with high conduction are discussed.