Plasticizers for Solid Polymer Electrolytes.

Abstract

The ionic conductivity of a solid polymer electrolyte based on a lithium salt dissolved in a poly(ethylene oxide) (PEO) host was significantly improved with the use of plasticizing agents and a lithium ion coordinating compound. Either a plasticizing salt, solvent or combinations of both were incorporated into freestanding solution-cast films of (PEO)x(LiCF3SO3). The greatest enhancement of conductivity was observed when the plasticizing salt (LiN(CF3SO2)2) and a plasticizing solvent (diethyl phthalate, dimethyl phthalate, or dimethylglycol phthalate) were combined, with most notable improvement occurring below the melting temperature of PEO (approx. 66 deg C). Addition of a low concentration of 6,6-dibenzyl-14-crown-4, a lithium ion coordinating compound, also improved ionic conductivity. Electrochemical stability was determined by cyclic voltammetry, showing that plasticizers were generally stable between 4.3 V and 1.5 V versus lithium. jg

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1995
Accession Number
ADA294856

Entities

People

  • Charles W. Walker Jr.
  • Mark Salomon

Organizations

  • United States Army Research Laboratory

Tags

DTIC Thesaurus Topics

  • Acyclic Hydrocarbons
  • Alkenes
  • Chemical Compounds
  • Conductivity
  • Electrolytes
  • Ethylene Oxide
  • Ethylenes
  • Hydrocarbons
  • Organic Compounds
  • Oxides
  • Phthalates
  • Plasticizers
  • Voltammetry

Fields of Study

  • Materials science

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Polymer Science and Engineering.