ae9b01821_si_001.pdf (527.84 kB)
Thin Fiber-Based Separators for High-Rate Sodium Ion Batteries
journal contribution
posted on 2019-11-08, 20:03 authored by Laura Coustan, Jean-Marie Tarascon, Christel Laberty-RobertA thermally
resistant, high-performance electrospun hybrid PVDF-HFP/SiO2 fiber-based separator (EHS) has been successfully fabricated
and its performance for sodium ion batteries explored. The EHS, containing
40% of its weight as SiO2, is made of intermingled nonwoven
hybrid organic (PVDF-HFP) inorganic (SiO2) fibers (∼145
nm) to produce a highly porous network (∼85% in volume). This
EHS separator shows an important electrolyte uptake with nearly no
swelling, and an interface stability comparable to today’s
commercialized Al2O3-coated PP and cellulose
separators. Full NVPF//NaPF6-EC:PC//hard carbon cells using
EHS show low ionic resistance, excellent rate capability, cycling
retention, and longer short-circuit time.