Hollow mesoporous silica sphere-embedded composite separator for high-performance lithium-ion battery

摘要: A high-performance composite separator based on hollow mesoporous silica spheres, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP), and poly(ethylene terephthalate) nonwoven was explored as lithium-ion battery via a dip coating technique followed by phase separation wet process. Systematical investigations including morphology characterization, porosity measurement, electrolyte wettability, thermal shrinkage testing, cell performance examination are carried out. It is demonstrated that the unique structures of spheres endow with well-defined microporous structure. Owing to preferable microstructure relatively polar constituents, exhibits higher porosity, superior outstanding stability. Based above advantages, shows better electrochemical performances, such discharge C-rate capability cycling performance, compared commercialized PE separator. This research presents simple approach prepare separator, which be good candidate for batteries.