Ding Lei, Li Dandan, Zhang Sihang, Zhang Yuanjie, Zhao Shuyue, Du Fanghui, Yang Feng
Shandong Key Laboratory of Chemical Energy Storage and New Battery Technology, School of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Road, Liaocheng 252000, China.
School of Food Science and Engineering, Hainan University, 58 Renmin Avenue, Haikou 570228, China.
Polymers (Basel). 2024 Sep 20;16(18):2659. doi: 10.3390/polym16182659.
Polyolefin separators with worse porous structures and compatibilities mismatch the internal environment and deteriorate lithium-ion battery (LIB) combination properties. In this study, a sulfonated SiO (SSD) composited polypropylene separator (PP@SSD) is prepared to homogenize pore sizes and in situ-built SSD coatings on porous skeletons. Imported SSD uniformizes pore sizes owing to centralized interface distributions within casting films. Meanwhile, abundant cavitations enable the in situ SSD coating to facilely fix onto porous skeleton surfaces during separator fabrications, which feature simple techniques, low cost, environmental friendliness, and the capability for continuous fabrications. A sturdy SSD coating on the porous skeleton confines thermal shrinkages and offers a superior safety guarantee for LIBs. The abundant sulfonic acid groups of SSD endow PP@SSD with excellent electrolyte affinity, which lowers Li transfer barriers and optimizes interfacial compatibility. Therefore, assembled LIBs give the optimal C-rate capacity and cycling stability, holding a capacity retention of 82.7% after the 400th cycle at 0.5 C.
具有较差多孔结构和兼容性不匹配的聚烯烃隔膜与内部环境不相容，会使锂离子电池（LIB）的综合性能恶化。在本研究中，制备了一种磺化SiO（SSD）复合聚丙烯隔膜（PP@SSD），以均匀孔径并在多孔骨架上原位构建SSD涂层。引入的SSD由于铸膜内集中的界面分布而使孔径均匀化。同时，大量的空化作用使原位SSD涂层在隔膜制造过程中能够轻松地固定在多孔骨架表面，其特点是技术简单、成本低、环境友好且具备连续制造能力。多孔骨架上坚固的SSD涂层限制了热收缩，并为锂离子电池提供了卓越的安全保障。SSD丰富的磺酸基团赋予PP@SSD优异的电解质亲和力，降低了锂传输势垒并优化了界面兼容性。因此，组装的锂离子电池具有最佳的倍率性能和循环稳定性，在0.5 C下第400次循环后容量保持率为82.7%。
