Doping crystalline polymer electrolytes with glymes

Chuhong Zhang, Edward Staunton, Yuri G. Andreev, Peter G. Bruce

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Following our discovery that crystalline polymers can support ionic conductivity, in contrast to earlier views, we have investigated raising their conductivity by replacing PEO molecules in the conducting crystalline complexes PEO6 : LiXF6, X = P, As, by the glyme molecules CH3O(CH2CH2O)(3)CH3 (triglyme, G(3)) and CH3O(CH2CH2O)(4)CH3 (tetraglyme, G(4)). In all cases increasing the value of x in (PEO(1-x)GZ(x))(6) : LiXF6, where Z = 3 or 4 and X = P, As, leads to an increase in conductivity because of conduction through a liquid phase that must be present when the 6 : 1 composition is retained above x = 0. However, in one case, true doping of a glyme within the 6 : 1 crystal structure was observed, (PEO(0.75)G4(0.25))(6) : LiPF6. The increased number of chain ends arising from replacement of the 1000 Da PEO ( 22 EO units) by G4 increases the number of defects that are present where chain ends meet along the PEO tunnels, within which the Li+ ions migrate, thus raising the conductivity compared with the undoped 6 : 1 complex. This is the first example in which a molecular dopant has been introduced into the 6 : 1 crystalline complex and hence the first example of increasing the conductivity in crystalline polymer conductors by such a mechanism.

Original languageEnglish
Pages (from-to)3222-3228
Number of pages7
JournalJournal of Materials Chemistry
Volume17
DOIs
Publication statusPublished - 2007

Keywords

  • IONIC-CONDUCTIVITY
  • POLY(ETHYLENE OXIDE)
  • SOLID ELECTROLYTES
  • CONDUCTORS
  • COMPLEXES
  • STORAGE
  • MODELS

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