Metal-Organic Framework Sandwiching Porous Super-Engineering Polymeric Membranes as Anionphilic Separators for Dendrite-free Lithium Metal Batteries,Advanced Functional Materials

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Metal-Organic Framework Sandwiching Porous Super-Engineering Polymeric Membranes as Anionphilic Separators for Dendrite-free Lithium Metal Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-09-14 , DOI: 10.1002/adfm.202207969
Guo Lin ₁ , Kun Jia _{1,

2,

3} , Zhongxiang Bai ₁ , Chenchen Liu ₁ , Shuning Liu ₁ , Yumin Huang _{1,

2} , Xiaobo Liu _{1,

2}

Affiliation

The development of multifunctional separators can be an effective solution for solving the lithium dendrite and safety issues of lithium metal batteries (LMBs). This study reveals an interfacial reaction protocol to prepare a functional separator to regulate lithium-ion transport and enhance the safety of LMBs. Specifically, the well-organized anionphilic MOFs layers are in situ grafted on both sides of porous super-engineering polyarylene ether nitrile (PEN) membranes pre-modified with polydopamine (PDA), which leads to sandwiched MOF/PEN@PDA/MOF multifunctional separators. Electrochemical tests prove that the optimized separator acts as a “Li-ion guides” to balance the internal electric field and limit the free migration of anions, which extends the “Sand's time” of lithium dendrite nucleation and contributes a high Li⁺ transfer number of 0.81. On account of the alleviated interface side reactions, the optimized battery exhibits a highly stable lithium plating–stripping cycle of over 500 h. Meanwhile, the functional separator shows better thermal stability than its conventional polypropylene counterpart. Thanks to these features, the assembled LFP/Li cells with optimized separator exhibit stable cycling performance and high coulombic efficiency of 98% even at 90 °C. The current study opens a new path to designing separators for solving the lithium dendrite and safety issues of LMBs.

中文翻译：

金属有机骨架夹层多孔超级工程聚合物膜作为无枝晶锂金属电池的亲阴离子隔膜

开发多功能隔膜可以有效解决锂金属电池（LMB）的锂枝晶和安全问题。本研究揭示了一种界面反应方案，用于制备功能性隔膜以调节锂离子传输并提高 LMB 的安全性。具体来说，将组织良好的亲阴离子 MOFs 层原位接枝在用聚多巴胺 (PDA) 预改性的多孔超级工程聚亚芳基醚腈 (PEN) 膜的两侧，从而形成夹层式 MOF/PEN@PDA/MOF 多功能隔膜. 电化学测试证明，优化后的隔膜起到了“锂离子向导”的作用，平衡了内部电场，限制了阴离子的自由迁移，延长了锂枝晶成核的“沙子时间”，提高了Li ⁺转数0.81。由于减少了界面副反应，优化后的电池表现出超过 500 小时的高度稳定的锂电镀-剥离循环。同时，功能性隔膜显示出比传统聚丙烯隔膜更好的热稳定性。由于这些特性，具有优化隔膜的组装 LFP/Li 电池即使在 90 °C 下也表现出稳定的循环性能和 98% 的高库仑效率。目前的研究为设计分离器开辟了一条新途径，以解决 LMB 的锂枝晶和安全问题。

更新日期：2022-09-14

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