Optimization of porosity and tensile strength of electrospun polyacrylonitrile nanofibrous membranes

The prominent objective of this study is to improve the thermal shrinkage and wettability of lithium-ion battery membrane separators based on Polyacrylonitrile (PAN) formed using an electrospinning technique. To achieve this goal, a PAN blended with highly hydrophilic Polyvinylalcohol (PVA) is formed, using malonic acid (MA) as a cross-linker. Due to the excellent hydrophilic properties of PVA and the network formation inside the separators (because of the MA crosslinker presence), the results show significant improvement in the separator properties. For this reason, at the optimum concentrations of 5 wt.% PVA and 5 wt.% MA (sample F4), an increase of wettability (contact angle from 85 for pure PAN to 42 for the F4 separator) is able to be seen. The electrolyte uptake was significantly increased, as for the F4 sample is increased to 1,150%, which is 2.67 times higher than the PAN with 430%. The improved separators showed higher porosity, better tensile strength, lower thermal shrinkage, and better electrochemical performance than the pure PAN separator. It showed an ion conductivity of 3.03 mS/cm, a wide electrochemical stability window of 5.2 V and an initial discharge capacity of 156.4 mAh/g.

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“…F1, F2, F3, and F4 separators showed higher porosities than PAN separator. This trend has also been reported in other investigations 13,34,43 …”

Section: Resultssupporting

confidence: 91%

Improvement of PAN separator properties using PVA/malonic acid by electrospinning in lithium ion‐batteries

Khodaverdi

Vaziri

Javanbakht

et al. 2020

J of Applied Polymer Sci

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“…The average diameters of electrospinning membranes are summarized in Table 1. According to the magnitude of range (R), 42 the magnitude order about the influence of four parameters on fiber diameter is: concentration>injection speed>receiving distance>voltage, and A3B2C3D2 is the best combination of parameters. Using the optimum parameters, PI, PMIA and PI/PMIA electrospinning membranes were prepared, they show good morphologies without beads, fiber strands and/or yarn break (Figure 2), and the average diameters of PI, PMIA, PI/PMIA and H-PI/PMIA are found to be 300, 337, 170, and 175 nm by ImagePro Plus, respectively.…”

Section: Preparation and Characterization Of Pi/pmia Membranesmentioning

confidence: 99%

Achieving superiorly highheat‐dimensionalstability, high strength, and good electrochemical performance for electrospun separators in powerlithium‐ionbattery through building unique condensed structure based on polyimide and poly (m‐phenylene isophthalamide)

Yuan

Liang

et al. 2021

J of Applied Polymer Sci

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It is still a challenge for simultaneously achieving high heat resistance, high strength and outstanding electrochemical performance for separators in power lithium-ion battery (PLB). Herein, new high performance electrospun separators are developed through building unique structure based on polyimide (PI) and poly (m-phenylene isophthalamide) (PMIA). Orthogonal tests (4 4 ) show that the magnitude order of electrospinning factors on the morphology of membrane is concentration>injection rate>receiving distance>voltage. With the optimum factors, the electrospun membrane (PI/PMIA) was prepared, which was further pressed at 100 C for 10 min to get treated membrane (H-PI/ PMIA). Interestingly, the comprehensive performance of PI/PMIA is not a simple combination of those of PI and PMIA; instead, PI/PMIA has much better thermal and mechanical properties than both PI and PMIA, proving that PI/PMIA has a synergistic effect. PI/PMIA and H-PI/PMIA not only have good ionic conductivity and electrochemical stability, but also have superiorly high properties including dimensional stability (thermal shrinkage temperature>300 C), tensile strengths (24.1 MPa for PI/PMIA, 34.3 MPa for H-PI/PMIA) and capacity retentions (97.9%, 99.2%) compared with electrospun membranes for PLBs reported in the literature so far (SCI database). The mechanism behind these attractive performances is discussed from condensed structure of membranes. K E Y W O R D Sbatteries and fuel cells, membranes, structure-property relationships | INTRODUCTIONBesides the wide applications in electronic and electrical fields, lithium-ion battery is becoming one main power source and expected to replace petroleum. 1 Separator is not only the key component, which is also key factor of determining the heat resistance, safety, efficiency, and cycling performance of power lithium-ion battery (PLB). 2

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“…An efficient and scalable method has been developed to obtain hierarchically constructed microporous PVDF-HFP separators for lithium-ion batteries as shown in Figure 5.1 [106]. at 1C [134] To enhance the mechanical properties, thermal and dimensional stabilities, cross-linked membranes covalently integrated with hybrid silsesquioxane components were fabricated by in-situ crosslinking method, obtaining armor-like shell structures coated on PVDF-HFP fibers In order to improve the separator-electrode interface and, thus, to improve operational safety, a novel separator was produced based on nanostructured PVDF-HFP membranes directly deposited on a carbon anode through efficient, scalable electrophoretic deposition (EPD) in a surfactant-free colloidal system [110]. The as-assembled half battery with this approach exhibits ultra-high cycle stability and high discharge capacities [110].…”

Section: Recent Advances In Separator Membranes For Li-ion Batteriesmentioning

confidence: 99%

“…Through this method, it is possible to control pore size and porosity and these membranes in order to improve electrolyte uptake, porosity, ionic conductivity and electrochemical stability [133]. Polyacrylonitrile (PAN) nanofibrous membranes were prepared by electrospinning technique confirming that the porosity of the separators is essential to tailor the electrochemical performance of batteries, and that the tensile strength plays a key role in the winding operation during battery assembly [134].…”

Section: Figure 53 -Schematic Representation Of Separators With Different Patterns -Hexagons Linesmentioning

confidence: 99%

Synthetic polymer-based membranes for lithium-ion batteries

Martins

Nunes-Pereira

Lanceros‐Méndez

et al. 2020

Synthetic Polymeric Membranes for Advanced Water Treatment, Gas Separation, and Energy Sustainability

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Efficient energy storage systems are increasingly needed due to advances in portable electronics and transport vehicles, lithium-ion batteries standing out among the most suitable energy storage systems for a large variety of applications. In lithium-ion batteries, the porous separator membrane plays a relevant role as it is placed between the electrodes and serves as a charge transfer medium and affects the cycle behavior. Typically, porous separators membranes are comprised of a synthetic polymeric matrix embedded in the electrolyte solution.The present chapter focus on recent advances in synthetic polymers for porous separation membranes, as well as on the techniques for membrane preparation and physicochemical characterization. The main challenges to improve synthetic polymer performance for battery separator membrane applications are also discussed.

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Optimization of porosity and tensile strength of electrospun polyacrylonitrile nanofibrous membranes

Cited by 39 publications

References 31 publications

Improvement of PAN separator properties using PVA/malonic acid by electrospinning in lithium ion‐batteries

Improvement of PAN separator properties using PVA/malonic acid by electrospinning in lithium ion‐batteries

Achieving superiorly highheat‐dimensionalstability, high strength, and good electrochemical performance for electrospun separators in powerlithium‐ionbattery through building unique condensed structure based on polyimide and poly (m‐phenylene isophthalamide)

Synthetic polymer-based membranes for lithium-ion batteries

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