Abstract
Nowadays lithium-ion batteries are widely used in many electrical equipments. Separators are a key component in lithium-ion batteries (LIBs) and perform an important role in the performance and safety of batteries. Weak wettability and termal resistance of polyolefine separators cause to limit their efficiency in LIBs. In the current research, the surface of a commerical PP separator was modified by polyvinyl alcohol (PVA)-SiO2 coating layer using the electrospining method. Gurley test was conducted to obtain the permability of the designed separators. Surface tension, viscosity and electrical conductivity of the electrospining solution were also measured. The electrospining parameters (concentration of PVA and SiO2, voltage and time) were optimized via an experimental design. The obtained results showed that, the shrinkage was minimized for the solution of 7.5wt%PVA-15wt%SiO2 which was fabricated at 16.7 kV for 1.5 h. It was revealed that addition of SiO2 nanoparticles as well as incraesing the concentration of the electrospining solution led to increase in viscosity and surface tension of separators. Si–O-Si absorbtion peaks were appeared in FTIR spectrum of PVA-SiO2 fibers compared to PVA fibers. Addition of 20 wt% SiO2 nanoparticles to 12 wt% PVA solution increased the elecrical conductivity from 712 μm to 725 μm. The discharge rate capability results showed that the optimized coated separator had the ability to deliver 61% of initial capacity while the pristine separator delivered 41%, at the same C-rate. Finally the optimized coated separator exhibited the capacities retention of 93% with respect to 87% for pristine separator after 50 cycles.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Rahmani, M., Moghim, M.H., Zebarjad, S.M. et al. Surface modification of a polypropylene separator by an electrospun coating layer of Poly(vinyl alchohol)-SiO2 for lithium-ion batteries. J Polym Res 30, 129 (2023). https://doi.org/10.1007/s10965-023-03491-2
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DOI: https://doi.org/10.1007/s10965-023-03491-2