Enhancing safety and electrochemical performance of lithium-ion batteries with P/N-IL@NH2-UIO-66 functionalized PVDF separators

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2025-09-23 DOI:10.1016/j.jelechem.2025.119498

Hua Yu , Xuan Wang , Lijun Yang , Qirui Wu , Houming Shen , Geming Wang , Peng Fan

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引用次数: 0

Abstract

The development of high-performance separator materials has become crucial with the ever-increasing demands for enhanced safety and energy density of lithium-ion batteries in electric vehicles and large-scale energy storage systems. Here, a novel high-safety functionalized separator was prepared by synthesizing a composite material that encapsulates phosphorus‑nitrogen-containing ionic liquid (P/N-IL) within NH₂-UIO-66-Zr metal-organic framework (MOF), and then combining this composite with a polyvinylidene fluoride (PVDF) P/N-IL@NH₂-UIO-66/PVDF separator. This functionalized P/N-IL@NH₂-UIO-66/PVDF separator significantly improves the flame-retardant performance of NCM811 batteries, effectively mitigating the risks of electrolyte combustion and explosion. Meanwhile, the porous structure of P/N-IL@NH₂-UIO-66 material optimizes the Li⁺ transport pathways, resulting in an increase in the ionic conductivity of NCM811 battery o 3.1 × 10⁻⁴ S/cm (compared to only 3.4 × 10⁻⁶ S/cm for the pure PVDF separator). The Li⁺ transference number is also elevated to 0.68. Moreover, after 600 cycles at a 1C current density, the capacity retention rate reaches as high as 71 %, with an average coulombic efficiency of 96 %, substantially enhancing the electrochemical performance and cycling stability of the battery. This work offers a novel technological pathway for the development of high-safety, high-performance lithium-ion batteries, as well as for the application of ionic liquids and MOFs.

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P/N-IL@NH2-UIO-66功能化PVDF隔膜提高锂离子电池安全性和电化学性能

随着电动汽车和大型储能系统对锂离子电池安全性和能量密度的要求不断提高，高性能隔膜材料的开发变得至关重要。本文通过将含磷氮离子液体（P/N-IL）包封在NH2-UIO-66-Zr金属有机骨架（MOF）内的复合材料，与聚偏氟乙烯（PVDF） P/N-IL@NH2-UIO-66/PVDF分离器结合，制备了一种新型的高安全性功能化分离器。该功能化P/N-IL@NH2-UIO-66/PVDF隔膜显著提高了NCM811电池的阻燃性能，有效降低了电解液燃烧爆炸的风险。同时，P/N-IL@NH2-UIO-66材料的多孔结构优化了Li+的传输途径，使NCM811电池的离子电导率提高到3.1 × 10−4 S/cm（而纯PVDF隔膜的离子电导率仅为3.4 × 10−6 S/cm）。Li+迁移数也提高到0.68。在1C电流密度下循环600次后，容量保持率高达71%，平均库仑效率达到96%，大大提高了电池的电化学性能和循环稳定性。这项工作为开发高安全性、高性能的锂离子电池，以及离子液体和mof的应用提供了一条新的技术途径。

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

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.