Induction Effect of Fluorine-Grafted Polymer-Based Electrolytes for High-Performance Lithium Metal Batteries

IF 26.6 1区材料科学 Q1 Engineering

Nano-Micro Letters Pub Date : 2025-05-13 DOI:10.1007/s40820-025-01738-9

Haiman Hu, Jiajia Li, Fei Lin, Jiaqi Huang, Huaiyang Zheng, Haitao Zhang, Xiaoyan Ji

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Abstract

Quasi-solid-state composite electrolytes (QSCEs) show promise for high-performance solid-state batteries, while they still struggle with interfacial stability and cycling performance. Herein, a F-grafted QSCE (F-QSCE) was developed via copolymerizing the F monomers and ionic liquid monomers. The F-QSCE demonstrates better overall performance, such as high ionic conductivity of 1.21 mS cm^–1 at 25 °C, wide electrochemical windows of 5.20 V, and stable cycling stability for Li//Li symmetric cells over 4000 h. This is attributed to the significant electronegativity difference between C and F in the fluorinated chain (‒CF₂‒CF‒CF₃), which causes the electron cloud to shift toward the F atom, surrounding it with a negative charge and producing the inductive effect. Furthermore, the interactions between Li⁺ and F, TFSI^‒, and C are enhanced, reducing ion pair aggregation (Li⁺‒TFSI^‒‒Li⁺) and promoting Li⁺ transport. Besides, ‒CF₂‒CF‒CF₃ decomposes to form LiF preferentially over TFSI^–, resulting in better interfacial stability for F-QSCE. This work provides a pathway to enable the development of high-performance Li metal batteries.

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氟接枝聚合物基电解质对高性能锂金属电池的诱导效应

准固态复合电解质（qsce）显示出高性能固态电池的前景，但它们仍在界面稳定性和循环性能方面苦苦挣扎。通过F单体与离子液体单体的共聚，制备了接枝F的QSCE （F-QSCE）。F- qsce整体性能较好，在25℃时离子电导率高达1.21 mS cm-1，电化学窗口宽达5.20 V，在4000 h内Li//Li对称电池的循环稳定性稳定。这是由于氟化链（-CF2-CF-CF3）中C和F之间存在显著的电负性差异，导致电子云向F原子移动，并以负电荷包围F原子，从而产生感应效应。此外，Li+与F、TFSI -和C之间的相互作用增强，减少离子对聚集（Li+ - TFSI - Li+），促进Li+运输。此外，- cf2 - cf - cf3比TFSI -更容易分解形成liff，从而使F-QSCE具有更好的界面稳定性。这项工作为高性能锂金属电池的开发提供了一条途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

32.60

自引率

4.90%

发文量

981

审稿时长

1.1 months

期刊介绍： Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.