矿产保护与利用2023，Vol.43Issue(6)：107-113,7.DOI:10.13779/j.cnki.issn1001-0076.2023.06.013
蒙脱石纳米片/聚偏氟乙烯改性聚丙烯复合隔膜的制备及性能研究
Preparation and Performance of Montmorillonite Nanosheet/PVDF-Polypropylene Composite Separator
摘要
Abstract
Commercial polyolefin separators exhibit poor electrolyte wettability and severe thermal shrinkage,which are not conducive to the safe and efficient operation of lithium-ion batteries.Using the unique crystal structure,good wettability,excellent thermal and mechanical stability of natural minerals,coating raw mineral materials on the surface of polyolefin separators is one of the methods to enhance the performance of the separators.The composite separator(MMT-PVDF/PP)was prepared by scraping coating method,and the mechanical properties,wettability,thermal stability of the composite separator were investigated.The results showed that when the mass ratio of montmorillonite nanosheets and binder in the coating solution was 5∶5,a three-dimensional stabilized structure of MMT-PVDF was formed on the surface of the composite separator.Compared with polypropylene separators(PP),the tensile strength of the MMT-PVDF/PP composite separator was increased by 6 times,and the electrolyte uptake and retention rate were increased by 24.93%and 96.7%,respectively.The composite separator can maintain a good dimensional morphology at 150℃for 1h with less than 10%shrinkage.关键词
锂离子电池/聚烯烃隔膜/电解液润湿性/热收缩性Key words
lithium-ion battery/polyolefin separator/electrolyte wettability/thermal shrinkage分类
矿业与冶金引用本文复制引用
孔静,李宇恒,胡雅祺,王蕊,陈天星..蒙脱石纳米片/聚偏氟乙烯改性聚丙烯复合隔膜的制备及性能研究[J].矿产保护与利用,2023,43(6):107-113,7.基金项目
国家自然科学基金青年基金项目(52104267) （52104267）
