Ding Wenfei, Liu Yuxing, Xu Lan
National Engineering Laboratory for Modern Silk, College of Textile and Engineering, Soochow University, 199 Ren-Ai Road, Suzhou 215123, China.
Jiangsu Engineering Research Center of Textile Dyeing and Printing for Energy Conservation, Discharge Reduction and Cleaner Production (ERC), Soochow University, Suzhou 215123, China.
Molecules. 2024 Aug 21;29(16):3938. doi: 10.3390/molecules29163938.
The design and preparation of high-performance separators for lithium-ion batteries (LIBs) have far-reaching practical significance in enhancing the overall performance of LIBs. Electrospun nanofiber separators (ENSs) have the characteristics of large specific surface area, high porosity, small pore size and good affinity with the electrolyte, making them become ideal candidates for LIB separators. In this work, polyacrylonitrile (PAN)/polyurethane (PU) (PAU) ENSs loaded with boehmite (BM) particles (BM/PAU ENSs) were mass-produced using spherical section free surface electrospinning (SSFSE), and used as LIB separators. Their morphology, structures and performances were tested and characterized. The results showed that all BM/PAU ENSs maintained excellent thermal dimensional stability in the range of 140-180 °C, and had good electrolyte wettability and high porosity. The composite BM/PAU-2 ENS with the best performance had a porosity of 52.5%, an electrolyte uptake rate of 822.1%, and an ionic conductivity of 1.97 mS/cm. Additionally, the battery assembled with BM/PAU-2 separator also demonstrated best electrochemical performance, cycling performance, and rate capability, with a capacity retention rate of 94.4% after 80 cycles at 0.5 C, making it a promising high-performance separator for LIBs.
设计和制备高性能锂离子电池（LIBs）隔膜对提升LIBs的整体性能具有深远的实际意义。电纺纳米纤维隔膜（ENSs）具有比表面积大、孔隙率高、孔径小以及与电解质亲和力好等特点，使其成为LIBs隔膜的理想候选材料。在这项工作中，采用无球冠自由表面电纺丝（SSFSE）大规模制备了负载勃姆石（BM）颗粒的聚丙烯腈（PAN）/聚氨酯（PU）（PAU）ENSs，并将其用作LIBs隔膜。对其形貌、结构和性能进行了测试与表征。结果表明，所有BM/PAU ENSs在140 - 180℃范围内均保持优异的热尺寸稳定性，具有良好的电解质润湿性和高孔隙率。性能最佳的复合BM/PAU - 2 ENS的孔隙率为52.5%，电解质吸收率为822.1%，离子电导率为1.97 mS/cm。此外，采用BM/PAU - 2隔膜组装的电池也表现出最佳的电化学性能、循环性能和倍率性能，在0.5 C下循环80次后容量保持率为94.4%，使其成为一种有前景的高性能LIBs隔膜。
