Facilitating Lithium-Ion Conduction in Gel Polymer Electrolyte by Metal-Organic Frameworks,ACS Materials Letters

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Facilitating Lithium-Ion Conduction in Gel Polymer Electrolyte by Metal-Organic Frameworks
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-09-29 , DOI: 10.1021/acsmaterialslett.0c00293
Xing Lu ₁ , Haiping Wu ₁ , Dejia Kong ₁ , Xinru Li ₁ , Li Shen ₁ , Yunfeng Lu ₁

Affiliation

Gel polymer electrolytes (GPL) that comprise polymer, lithium salts, and organic plasticizers hold great promise for safer lithium-ion batteries, because of liquid-like ionic conductivity, as well as solid-like leakage-free property. However, only a small portion of ion conduction effectively carried by Li⁺ ions (or low Li⁺ transference number) gives rise to poor interfacial stability between GPL with electrodes and limited practicability. Here, metal-organic framework (MOF) containing open-metal sites (OMSs) are used as fillers that endow GPL simultaneously with high ionic conductivity (>1 mS cm^–1) and a high Li⁺ transference number (up to 0.66), which results from immobilized anions and facilitated cation conduction by virtue of OMSs. Implementations of the GPL with OMSs-laden MOF in pseudo-solid-state batteries afford affinitive interfaces involving metallic Li and intercalation-type electrodes (LiFePO₄, Li₄Ti₅O₁₂), which contribute to significant improvements in battery durability and thereby could introduce a new type of MOF fillers for solid-state polymer electrolytes.

中文翻译：

金属有机骨架促进凝胶聚合物电解质中锂离子的传导

包含聚合物，锂盐和有机增塑剂的凝胶聚合物电解质（GPL）由于具有像液体一样的离子电导率以及像固体一样的无泄漏特性，因此有望成为更安全的锂离子电池的理想选择。但是，只有一小部分由Li ⁺离子有效承载的离子传导（或低的Li ⁺转移数）会导致GPL与电极之间的界面稳定性变差，并且实用性受到限制。在这里，含有开放金属位点（OMS）的金属有机骨架（MOF）被用作填充剂，赋予GPL同时具有高离子电导率（> 1 mS cm ^–1）和高Li ⁺迁移数（最高0.66），是由于OMS固定了阴离子并促进了阳离子传导。在伪固态电池中使用带有OMSs的MOF的GPL的实现可提供包含金属Li和插入型电极（LiFePO ₄，Li ₄ Ti ₅ O ₁₂）的亲和界面，这有助于显着提高电池的耐用性，从而可以推出用于固态聚合物电解质的新型MOF填料。

更新日期：2020-11-02

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