Metal–organic frameworks (MOFs) emerging as a type of functional material have been widely used in electrochemical energy storage and conversion in recent years. Hollow MOFs with a large pore volume and surface area can increase the contact area between active materials and electrolytes, thus improving the ionic conductivity of the materials. Herein, we obtained a kind of hollow MOF (ZIF-8) using carboxylate-terminated polystyrene microspheres as exterior templates. Transmission electron microscopy and N₂ adsorption/desorption analysis revealed that the average cavity diameter of hollow ZIF-8 is 1 μm. Moreover, hollow ZIF-8 exhibits excellent electrochemical quality with an ionic conductivity of 7.36 × 10⁻⁴ S cm⁻¹, a lithium ion transference number of 0.83 and an activation energy of 0.15 eV in a wide stable electrochemical window of 2.0–6.5 V at room temperature. Compared with the traditional non-hollow ZIF-8, the electrochemical performance has been improved obviously. Consequently, our strategy of fabrication of large pore volume hollow MOFs provides a new perspective for the development of solid electrolytes with excellent lithium ionic conductivity.

中文翻译：

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通过制造大孔体积空心ZIF-8显着提高固态电解质的锂离子电导率

近年来，作为一种功能材料出现的金属有机骨架（MOF）已广泛应用于电化学能量存储和转换。具有大孔体积和表面积的中空MOFs可以增加活性材料与电解质之间的接触面积，从而提高材料的离子电导率。在此，我们获得了一种使用羧酸酯封端的聚苯乙烯微球作为外部模板的中空 MOF (ZIF-8)。透射电子显微镜和N ₂吸附/解吸分析表明，中空ZIF-8 的平均空腔直径为1 μm。此外，中空 ZIF-8 表现出优异的电化学性能，离子电导率为 7.36 × 10 ^-4 S cm ^-1，在室温下 2.0-6.5 V 的宽稳定电化学窗口中，锂离子转移数为 0.83，活化能为 0.15 eV。与传统的非空心ZIF-8相比，电化学性能有了明显的提升。因此，我们制备大孔体积空心 MOF 的策略为开发具有优异锂离子电导率的固体电解质提供了新的视角。