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PVDF/PU blend membrane separator for lithium-ion batteries via non-solvent-induced phase separation (NIPS)

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Abstract

Membrane separator based on the polyvinylidene fluoride (PVDF) is prepared via the non-solvent-induced phase separation (NIPS) method with water and ethanol as non-solvent and a mixture of dimethylformamide (DMF) and acetone as solvent. The effect of various acetone/DMF ratios and non-solvent material on the physical and electrochemical properties of the separator is studied by FE-SEM, tensile strength, electrochemical AC-impedance spectroscopy (EIS), thermal stability, and linear sweep voltammetry (LSV). The charge-discharge studies are carried out by fabricating a lithium foil/polymer electrolyte membrane/LiFePO4 cell. The results show that with the change of solvent and non-solvent, the structure and morphology of the separator change and its physical and electrochemical properties. The results indicate that the membrane sample with non-solvent ethanol, acetone/DMF: 80/20 (wt/wt), and PVDF/PU: 95/5 (wt/wt) shows high porosity (66.3%) and high ionic conductivity (1.34 mS/cm) as well as excellent thermal stability.

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Acknowledgements

This research was supported by Sharif University of Technology.

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Authors and Affiliations

  1. Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran

    Omid Javadi, Abolfazl Fathollahi Zonouz, Mohammad Soltanieh & Seyyed Abbas Mousavi

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  1. Omid Javadi
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  2. Abolfazl Fathollahi Zonouz
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  3. Mohammad Soltanieh
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  4. Seyyed Abbas Mousavi
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Correspondence to Mohammad Soltanieh.

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Javadi, O., Fathollahi Zonouz, A., Soltanieh, M. et al. PVDF/PU blend membrane separator for lithium-ion batteries via non-solvent-induced phase separation (NIPS). J Solid State Electrochem 25, 2385–2394 (2021). https://doi.org/10.1007/s10008-021-05010-z

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  • DOI: https://doi.org/10.1007/s10008-021-05010-z

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