65. Electrospun nanofiber based LiB separator with tunable surface functional groups via vapor phase treatment
- Journal
- Journal of Membrane Science
- Page
- 125066
- Date
- (2026.03), JCR : 4.8%, IF : 9
- Year
- 2026
- Link
- https://doi.org/10.1016/j.memsci.2025.125066 3618회 연결
Fiber-based nonwoven membrane has been considered as high-performance separator for Li-ion battery to overcome low ion conductivity, and to improve energy density of conventional separator. In this study, we fabricated polyacrylonitrile (PAN) nonwoven separators through syringeless electrospinning that can increase the production rate and density of nonwoven web. Furthermore, surface modification was carried out via vapor phase treatment (VPT), introducing ethylenediamine (EDA) and ethanolamine (EtA) which have different functional end groups. Porous morphologies of nonwoven web were maintained stably even in amine-modified PAN separators after VPT and roll pressing, and these amine modifications facilitated high electrolyte affinity and polarity, resulting in the outstanding ion conductivity (3.01 mS cm−1) and Li+ transference number (0.72), especially in the case of EtA-modified PAN separator (PAN@EtA). Moreover, LiNi0.6Co0.2Mn0.2O2 (NCM622)/graphite full cell with PAN@EtA separator exhibited discharge capacity of 124.09 mAh g−1 at 10 C then recovered 93 % at 0.5 C, and capacity retention of 79.9 % after 350 cycles at 0.5 C.