Lithium Ion Transport Across and Between Phase Boundaries in Heterogeneous Polymer Electrolytes, Based on PVdF

Abstract

Initial investigations of polymer electrolytes based on PVdF-HFP and LiPF6 dissolved in either EC/PC or EC/DMC mixtures have been carried out via high pressure complex impedance methods and 7Li NMR. All results indicate that the polymer matrix, while effectively immobilizing the liquid component, does not significantly affect the ion transport mechanism inherent to liquid electrolytes. In the first reported attempt to exploit 17O NMR to study lithium battery electrolytes, we have prepared 17O-enriched Li triflate and several electrolytes containing the isotopically enriched salt dissolved in DEC, DMC, and mixtures of DMC/EC. Line widths were measured as a function of electrolyte solvent and temperature, and suggest that EC inhibits the formation of ion pairs, when added to DMC.

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Document Details

Document Type
Technical Report
Publication Date
Feb 26, 1998
Accession Number
ADA344887

Entities

People

  • Steven G. Greenbaum

Organizations

  • Hunter College

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Abstracts
  • Boundaries
  • Electrical Conductivity
  • Electrical Properties
  • Electrolytes
  • High Pressure
  • Ion Ion Interactions
  • Ionic Liquids
  • Ions
  • Liquids
  • Lithium Batteries
  • Magnetic Resonance
  • New York
  • Nuclear Magnetic Resonance
  • Polymeric Films
  • Pressure Measurement
  • Transport Ships

Fields of Study

  • Materials science

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  • Organic Chemistry