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

Javadi, O ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1007/s10008-021-05010-z
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2021
  4. Abstract:
  5. 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. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature
  6. Keywords:
  7. Acetone ; Dimethylformamide ; Electric discharges ; Electrochemical impedance spectroscopy ; Electrochemical properties ; Electrolytes ; Ethanol ; Fluorine compounds ; Lithium-ion batteries ; Phase separation ; Separators ; Tensile strength ; Thermodynamic stability ; Ac impedance spectroscopy ; Charge-discharge ; Electrolyte membrane ; Linear sweep voltammetry ; Membrane samples ; Membrane separators ; Polyvinylidene fluorides ; Structure and morphology ; Organic solvents
  8. Source: Journal of Solid State Electrochemistry ; Volume 25, Issue 8-9 , 2021 , Pages 2385-2394 ; 14328488 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10008-021-05010-z