Kim, Young Gon JEONG, BO GYEONG Park, Bum Jin Kim, Heejin Lee, Min Wook Jo, Seong Mu 2024-06-28T02:00:05Z 2024-06-28T02:00:05Z 2024-06-27 2024-07 https://pubs.kist.re.kr/handle/201004/150120 Porous silicon dioxide (SiO2)/poly(vinylidene fluoride) (PVdF), SiO2/PVdF, and fibrous composite membranes were prepared by electrospinning a blend solution of a SiO2 sol？gel/PVdF. The nanofibers of the SiO2/PVdF (3/7 wt. ratio) blend comprised skin and nanofibrillar structures which were obtained from the SiO2 component. The thickness of the SiO2 skin layer comprising a thin skin layer could be readily tuned depending on the weight proportions of SiO2 and PVdF. The composite membrane exhibited a low thermal shrinkage of ~3% for 2 h at 200 °C. In the prototype cell comprising the composite membrane, the alternating current impedance increased rapidly at ~225 °C, and the open-circuit voltage steeply decreased at ~170 °C, almost becoming 0 V at ~180 °C. After being exposed at temperatures of >270 °C, its three-dimensional network structure was maintained without the closure of the pore structure by a melt-down of the membrane. English MDPI Open Access Publishing Electrospun Silicon Dioxide/poly(vinylidene fluoride) Nanofibrous Membrane Comprising a Skin Multicore-Shell Nanostructure as a New High-Heat-Resistant Separator for Lithium-Ion Polymer Batteries Article 10.3390/polym16131810 1 Polymers, v.16, no.13 Polymers 16 13 Y scie scopus 001266751900001 Polymer Science Polymer Science Article PERFORMANCE CELLS THERMAL-STABILITY FIBERS separator high thermal property lithium secondary polymer battery SiO2/PVdF blend fiber electrospinning skin multicore-shell