近日，苏州大学徐岚团队报道了UiO-66功能化三明治复合隔膜以改善锂离子电池性能及安全性。相关论文于2026年8月19日发表在《中国高分子科学杂志》上。

热失控引发的安全问题严重阻碍了锂离子电池（LIBs）的进一步发展。作为LIBs的关键组分，具有高温自关闭功能的高性能静电纺丝纳米纤维隔膜（ENSs）能够防止由热失控引起的安全问题。

研究组通过材料筛选和结构设计，采用自由表面静电纺丝技术高效制备了一种三明治结构的高温自关闭聚丙烯腈/聚氨酯//添加十六烷基三甲基溴化铵的聚丁二酸丁二醇酯（PAN/PU//CPBS）ENS（简称CPC ENS）。高熔点的聚丙烯腈基ENS作为中间层，提供热稳定性；低熔点的聚丁二酸丁二醇酯基ENS作为外层，赋予其高温自关闭功能。为进一步提升性能，采用聚多巴胺对CPC ENS进行修饰，并负载具有丰富活性位点的多孔结构UiO-66，得到高性能自关闭UiO66@PDA@CPC ENS。

结果表明，UiO66@PDA@CPC ENS具有优异的电解液吸收率（740.7%±20.6%）和润湿性（接触角8.3°±0.3°），同时在160 °C下仍保持良好的热稳定性。此外，在0.5 C下循环100次后，组装电池的放电比容量保持在139.6 mAh/g，容量保持率为92.4%。同时，锂片表面形貌平整，表明UiO66@PDA@CPC ENS具有优异的长期循环稳定性，从而展示了其作为高性能安全LIB隔膜的巨大潜力。

附：英文原文

Title: UiO-66-functionalized Sandwich Composite Separators for Improved Performance and Safety of Lithium-ion Batteries

Author: Wen-Fei Ding, Yu-Xing Liu, Lan Xu

Issue&Volume: 2026-08-19

Abstract: Thermal runaway-induced safety issues have seriously hindered further development of lithium-ion batteries (LIBs). As a key component of LIBs, high-performance electrospun nanofiber separators (ENSs) with high-temperature self-closing functions can prevent safety issues caused by thermal runaway in LIBs. In this study, a sandwich-structured high-temperature self-closing polyacrylonitrile/polyurethane//adding cetyltrimethylammonium bromide to the poly(butylene succinate) (PAN/PU//CPBS) ENS (CPC ENS) was efficiently fabricated using free-surface electrospinning technology via material selection and structural design. A high-melting-point polyacrylonitrile-based ENS served as the intermediate layer, providing its thermal stability, while a low-melting-point polybutylene succinate-based ENS served as the outer layer, endowing it with a high-temperature self-closing function. To enhance its performance, CPC ENS was modified with polydopamine and loaded with porous structured UiO-66 rich in active sites, resulting in a high-performance self-closing UiO66@PDA@CPC ENS. The results showed that UiO66@PDA@CPC ENS had an excellent electrolyte uptake rate (740.7%±20.6%) and wettability (8.3°±0.3°), while maintaining good thermal stability at 160 °C. Furthermore, after 100 cycles at 0.5 C, the assembled battery maintained a discharge specific capacity of 139.6 mAh/g, with a capacity retention rate of 92.4%. Meanwhile, the surface of the lithium sheet had a flat morphology, indicating that UiO66@PDA@CPC ENS had superior long-term cycling stability, thus demonstrating its enormous potential as a high-performance and safe LIB separator.

DOI: 10.1007/s10118-026-3772-9

Source: https://www.cjps.org/en/article/doi/10.1007/s10118-026-3772-9/