Preparation and interfacial stability of single lithium-ion conductive polymer electrolytes
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School of Chemistry and Materials Science,Guizhou Normal University

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TQ152

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    Abstract:

    Three single lithium-ion conductive polymer electrolytes membrane were synthesized using lithium 4-styrenesulfonyl(trifluoromethylsulfonyl)imide (LiSTFSI), polyethylene glycol methyl methacrylate (PEGM), tetrafluoropropyl methacrylate (TFMA), octafluoropentyl methacrylate (OFMA) and dodecafluoroheptyl methacrylate (DFMA) as monomers. The membrane were characterized by FTIR, SEM, EIS and LSV. The results show that the synthesized electrolyte membrane have high ionic conductivity (90 ℃, 10-5 S/cm), wide electrochemical stability window (4.5 V) and high lithium-ion transference number (≈1). The button cell of membrane assembled CR 2025 was tested by constant potential intermittent titration (PITT). The results showed that the electrolyte membrane have a high lithium-ion diffusion coefficient (60 ℃, 10-9 cm2/s). After heat treatment, the interfacial stability between the electrolyte membrane and lithium metal was improved obviously. X-ray photoelectron spectroscopy shows that this was related to the enrichment of fluorine-containing side chain groups on the surface of the polymer electrolytes.

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History
  • Received:April 06,2023
  • Revised:May 14,2023
  • Adopted:May 25,2023
  • Online: January 10,2024
  • Published:
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