基于 MOF 的 3D 离子传导网络可在室温下实现高压全固态锂金属电池,ACS Materials Letters

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基于 MOF 的 3D 离子传导网络可在室温下实现高压全固态锂金属电池
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-03-13 , DOI: 10.1021/acsmaterialslett.3c00077
Siyan Zheng ₁ , Zhongliang Li ₁ , Luyi Chen ₁ , Yutong Huang ₁ , Junkai Shi ₁ , Shuxian Wang ₁ , Yang Liu ₁ , Yan Liu ₁ , Yue-Peng Cai ₁ , Qifeng Zheng ₁

Affiliation

具有高表面积、可调多孔结构和多功能功能的金属有机框架 (MOF) 在控制离子传输和设计高性能复合固体电解质 (CSE) 方面具有广阔的前景。然而，由随机分布的MOF颗粒引起的不连续离子传输和较差的机械支撑导致离子电导率不足和机械强度较差。在此，通过在 3D 聚酰亚胺纤维网络上原位生长的MOF 纳米晶体合理设计了一种高效且稳健的基于 MOF 的 3D 离子传导网络，其中（1）优化的 MOF 具有适当的孔径和丰富的开放金属位点可以有效地限制阴离子的运动使 Li ⁺通量均匀化，(2)原位^{密集堆积的 MOF 的生长建立了连续的离子通道，以促进 Li +}的快速传输，并且 (3) 机械和化学坚固的聚酰亚胺网络赋予 CSE 优异的机械强度和高氧化稳定性。因此，所得的 CSE 表现出高离子电导率、高 Li ⁺转移数、优异的 Li 相容性、宽电位窗口和优异的机械鲁棒性，这使得高压全固态锂金属电池能够在室内温度。

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MOF-Based 3D Ion-Conducting Network Enables High-Voltage All-Solid-State Lithium Metal Batteries at Room Temperature

Metal–organic frameworks (MOFs) with high surface area, tunable porous structure, and versatile functionality hold great prospects for manipulating ion transport and designing high-performance composite solid electrolytes (CSEs). However, the discontinuous ion transport and poor mechanical support arising from the randomly distributed MOF particles lead to insufficient ionic conductivity and inferior mechanical strength. Herein, a highly efficient and robust MOF-based 3D ion conducting network was rationally designed by in situ grown MOF nanocrystals on the 3D polyimide fiber network, where (1) the optimized MOF with appropriate pore sizes and abundant open metal sites can effectively restrict the movement of the anion to homogenize the Li⁺ flux, (2) the in situ growth of densely packed MOFs builds continuous ion channels to promote the rapid transport of Li⁺, and (3) the mechanically and chemically robust polyimide network bestows the CSE with superior mechanical strength and high oxidation stability. Consequently, the resulting CSE demonstrates high ionic conductivity, a high Li⁺ transference number, excellent Li compatibility, a wide potential window, and excellent mechanical robustness, which enables the stable cycling of high-voltage all-solid-state Li-metal batteries at room temperature.

更新日期：2023-03-13

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