Evaporation-induced, close-packed silica nanoparticle-embedded nonwoven composite separator membranes for high-voltage/high-rate lithium-ion batteries: Advantageous effect of highly percolated, electrolyte-philic microporous architecture
作者： Hyun-Seok Jeong , Eun-Sun Choi , Sang-Young Lee , Jong Hun Kim
DOI: 10.1016/J.MEMSCI.2012.05.038
关键词:
摘要: Abstract Evaporation-induced, close-packed silica (SiO 2 ) nanoparticle-embedded polyethylene terephthalate (PET) nonwoven composite separator membranes (hereinafter, referred to as “NW-separators”) are fabricated for application in high-voltage/high-rate lithium-ion batteries. The heat-resistant PET is employed a physical support suppress thermal shrinkage of the NW-separator. A distinctive characteristic NW-separator well-connected interstitial voids formed between compactly packed SiO nanoparticles adhered by polyvinylidene fluoride–hexafluoropropylene (PVdF–HFP) binders. This allows evolution highly percolated, electrolyte-philic microporous architecture In comparison commercialized (PE) separator, featuring aforementioned structural uniqueness exhibits substantial improvements porosity, air permeability, and electrolyte wettability, which contribute facile ionic transport retarded growth cell impedance during cycling. As result, superior performance obtained Notably, this advantageous effect on becomes more pronounced at challenging charge/discharge conditions high voltages (herein, 4.4 V) current densities.
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