Mechanical properties of heat‐treated polypropylene separators for Lithium‐ion batteries

Moghim, Mohammad Hadi; Nahvibayani, Ashkan; Eqra, Rahim

doi:10.1002/pen.26084

Cited by 9 publications

(4 citation statements)

References 47 publications

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“…[18][19][20][21] These affect the effective passage of lithium ions, making the battery prone to accidents. Therefore, polyolefins should be modified to improve the separator's thermal stability and wettability [22][23][24] However, the inherent low melting point and non-polarity of polyolefins greatly limit their application as separators. Hence, it is crucial to develop a separator with better overall properties for improving the performance of lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Mechanically enhanced battery separator prepared by hot‐pressing electrospun polyvinylidene fluoride@polymethyl methacrylate membranes with different fiber orientations in adjacent layers

Ye,

De Guzman,

et al. 2024

Polymer Engineering & Sci

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Compared with commercial polyolefin membranes, electrospun polymeric membranes have the advantages of higher porosity and better electrolyte wettability, but their poor mechanical performance limits their industrial use as battery separators. In this work, a layer‐to‐layer electrospinning is used for fabrication of PVdF@PMMA membranes, in which fibers in adjacent layers are arranged at a certain angle (0°, 30°, 60°, 90°). The as‐electrospun membranes are further hot‐pressed to boost their mechanical strength. Various techniques are employed to evaluate the membranes, such as scanning electron microscopy, differential scanning calorimetry, contact angle measurement, electrochemical impedance spectroscopy, and linear sweep voltammetry. The results show that polymethyl methacrylate partially melts during the hot‐pressing treatment, causing adjacent fibers in the membranes to bridge. The obtained membranes show different tensile strength values with the various angles between fibers. When the angle is 30°, the tensile strength can reach 22.09 MPa and higher porosity (74.68%), greater liquid electrolyte absorption (612.36%) than that of commercial polyolefin membrane are harvested. The lithium‐ion cell assembly with the membrane separator exhibits a discharge capacity reaching 142 mAh g−1 and an excellent capacity retention of 90.7%. This present study provides an innovative and promising approach for the fabrication of high‐performance battery separator by electrospinning.Highlights PVdF@PMMA membranes are prepared by a layer‐to‐layer electrospinning. In the membranes, fiber orientation in adjacent layers is kept at a certain angle. Hot‐pressing further boosts mechanical performance of the membranes. Membranes with different angle of fibers show various mechanical strengths.

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Section: Introductionmentioning

confidence: 99%

Mechanically enhanced battery separator prepared by hot‐pressing electrospun polyvinylidene fluoride@polymethyl methacrylate membranes with different fiber orientations in adjacent layers

Ye,

De Guzman,

et al. 2024

Polymer Engineering & Sci

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“…The application of nanofibers as components for anodes, cathodes, and separators has garnered significant interest in recent years (Cao et al, 2023) . The fabrication of nanofibers requires at least one conductive polymer as the matrix, such as polyacrylonitrile (PAN) (Lee et al, 2022) , polyvinylidene fluoride (PVDF) (Gong et al, 2019) , polyethersulfone (PES) (Liu et al, 2021a) , and polypropylene (PP) (Hu and Lin, 2021;Moghim et al, 2022). Active materials can be derived from semiconductor materials, such as SiO 2 and TiO 2 , and carbon-based materials, such as graphene (Liu et al, 2021b) , carbon nanotubes (Gonzalez et al, 2022) , and graphite (Rey et al, 2021) .…”

Section: Introductionmentioning

confidence: 99%

Preparation of PAN/PVDF Nanofiber Mats Loaded with Coconut Shell Activated Carbon and Silicon dioxide for Lithium-Ion Battery Anodes

Almafie,

Dani,

Riyanto

et al. 2024

Sci. Technol. Indones

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Utilizing carbon materials derived from natural biomass holds significant promise for battery applications, owing to their low cost, abundant availability, and environmentally sustainable characteristics. However, graphite anode materials do not meet the demands of efficient batteries. Coconut shell waste has the potential to be used as activated carbon in energy storage anodes. By adding silicon dioxide (SiO2) to maintain structural stability and electrochemical reaction kinetics, the advantages of CCS can be maximized. Polyacrylonitrile/polyvinylidene fluoride (PAN/PVDF) composite polymer was used as a matrix to embed CCS/SiO2 and synthesize nanofibers via electrospinning. The resulting nanofibers had diameters ranging from to 575–707 nm, with cross-linked, porous, and beadless characteristics. Mechanical properties were measured by single-fiber micro tensile tests. The young modulus, tensile strength, and toughness of each nanofiber were successfully maintained at 13.7 ± 0.4 MPa, 34.4 ± 0.1 MPa, and 982 ± 10 kJ/m3, respectively, because of the presence of a β-crystal growth layer that facilitated efficient stress transmission. The reduction-oxidation process response had a potential difference of less than 1.286 V in the first cycle, whereas for the third and fifth cycles, it was maintained below 3.416 V. The lithium-ion diffusion coefficient was below 4.73×1013 cm2/s. Using the anode directly, as in lithium-ion batteries, provided a high capacity of 382 mAh/g after 200 cycles. Good cycle stability, with over 98% retention of the initial capacitance after 200 charge/discharge cycles, underscores its potential for application in lithium-ion batteries.

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“…[10][11][12] The separators prepared by wet processing possess high porosity, uniform pore size, and good air permeability, satisfying the requirement of power batteries. 10,13 The pore structure, especially the porosity, pore size, etc., significantly affects the electrochemical performance of the battery and the strength of the separator. For example, the high porosity and open pore structure would increase the effective Li ion conductivity, [14][15][16] while the pore structure affects the strength of separators along two directions, such as the machine direction and transverse direction.…”

Section: Introductionmentioning

confidence: 99%

“…The polymer and diluent are shear‐mixed in a screw extruder; the molten mixture is then extruded into a thick casting film; the casting is then biaxial‐stretched to a few micrometer thick membrane; the diluent is finally removed in the extraction and dry process; finally, the UHMWPE separator is obtained 10–12 . The separators prepared by wet processing possess high porosity, uniform pore size, and good air permeability, satisfying the requirement of power batteries 10,13 …”

Section: Introductionmentioning

confidence: 99%

Understanding the pore structure evolution of polyethylene separator with dissipative particle dynamics simulation

Wang,

Wu,

et al. 2023

Polymer Engineering & Sci

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The commercialized lithium‐ion battery separators are mass‐produced by mixing ultra‐high molecular weight polyethylene (UHMWPE) and paraffin oil (PO). The dissipative particle dynamics method is utilized to investigate the extrinsic factors (shear rate and cooling rate) and the intrinsic factors (the molecular chain length) on the microstructure of the UHMWPE‐PO mixture. For the mixture with UHMWPE possessing the same chain length, the high shear rate promoted a lower porosity (~28%) and smaller pores. In contrast, the slow shearing led to a high porosity (~40%) and larger pores. For the mixture with UHMWPE possessing short and long chains, the shear rate hardly affects the porosity and the pore size: the porosity was kept at ~30%, and the pore size was reduced by ~35% compared to the model with the same‐chain‐length UHMWPE. The cooling rate after shearing is the dominant factor in determining the porosity and pore size: the fast cooling raised the porosity by ~33% but hardly increased the pore size, while the slow cooling raised the porosity by ~74%, and the pore size by ~105%. The current study provided a deep understanding of the pore structure evolution in separator processing.Highlights The effects of processing parameters on the pore structures are numerically illustrated. MD simulation and rheometer measurement assist DPD interaction parameters calibration for UHMWPE and PO. The low shear rate leads to a higher porosity and pore size. At the high shear rate, short UHMWPE chains reduce porosity but do not increase pore size. The fast‐cooling process slightly increases the porosity while keeping the pore size.

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Mechanical properties of heat‐treated polypropylene separators for Lithium‐ion batteries

Cited by 9 publications

References 47 publications

Mechanically enhanced battery separator prepared by hot‐pressing electrospun polyvinylidene fluoride@polymethyl methacrylate membranes with different fiber orientations in adjacent layers

Mechanically enhanced battery separator prepared by hot‐pressing electrospun polyvinylidene fluoride@polymethyl methacrylate membranes with different fiber orientations in adjacent layers

Preparation of PAN/PVDF Nanofiber Mats Loaded with Coconut Shell Activated Carbon and Silicon dioxide for Lithium-Ion Battery Anodes

Understanding the pore structure evolution of polyethylene separator with dissipative particle dynamics simulation

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