离子传输通道嵌入的MOF-in-COF结构作为复合准固体电解质，具有高度增强的电化学性能,Journal of Materials Chemistry A

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离子传输通道嵌入的MOF-in-COF结构作为复合准固体电解质，具有高度增强的电化学性能
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-02-14 , DOI: 10.1039/d3ta07329g
Kai Le Loo ₁ , Jeong Won Ho ₂ , Chan-Hwa Chung ₁ , Myoung-Woon Moon ₃ , Pil J. Yoo _{1,

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Affiliation

共价有机骨架（COF）材料已在先进储能系统中展现出作为固态电解质（SSE）的巨大潜力。然而，COF基电解质的局限性在于其在COF孔内的离子传导能力有限。为了克服这一挑战，许多研究人员将离子液体 (IL) 引入 COF 框架中，从而创建了一种称为 COF-IL (QSSE) 的准固态电解质。IL的掺入提高了锂离子的迁移率，但在电化学性能方面仍然存在一些限制。为了解决这个问题，在这项工作中，还采用金属有机框架（MOF）来控制和优化COF孔的性能。这导致形成 MOF-in-COF (MC) 结构，可以更有效地容纳 IL，为锂离子传输创造一条异常有效的途径。掺入IL的MC（IL@MC）固体电解质在室温下表现出1.5×10 ^-3 S cm ^-1的极高离子电导率，在60℃下的锂离子迁移数为0.26。这种性能的提高可归因于 COF 孔与 MOF 的功能化，MOF 充当传输阳离子的选择性门。

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Ion-transporting channel-embedded MOF-in-COF structures as composite quasi-solid electrolytes with highly enhanced electrochemical properties

Covalent organic framework (COF) materials have demonstrated significant potential as solid-state electrolytes (SSEs) in advanced energy storage systems. However, a limitation of COF-based electrolytes lies in their restricted ion-conducting ability within the COF pores. To overcome this challenge, numerous researchers have introduced ionic liquid (IL) into COF frameworks, resulting in the creation of a quasi-solid-state electrolyte known as COF-IL (QSSE). This incorporation of IL improves the mobility of lithium ions, but there are still some limitations in terms of electrochemical performance. To address this issue, in this work, metal organic frameworks (MOFs) are additionally employed to control and optimize the properties of COF pores. This leads to the formation of a MOF-in-COF (MC) structure that can more effectively accommodate IL, creating an exceptionally effective pathway for lithium-ion transportation. The IL-incorporated MC (IL@MC) solid electrolyte displays a notably high ionic conductivity of 1.5 × 10⁻³ S cm⁻¹ at room temperature and a lithium-ion transference number of 0.26 at 60 °C. This performance improvement can be attributed to the functionalization of the COF pores with MOFs, which act as selective gates for transporting cations.

更新日期：2024-02-14

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