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Solid state ion transport and phase behaviour in composites of N,N-methyl propylpyrrolidinium tetrafluoroborate and amorphous polyethylene oxide

journal contribution
posted on 01.01.2003, 00:00 authored by J Efthimiadis, G Annat, Jim Efthimiadis, Maria ForsythMaria Forsyth, D MacFarlane
The binary and ternary addition of 2 wt.% LiBF4 and 2 wt.% amorphous polyethylene oxide (aPEO) respectively to the plastic crystal forming salt P13BF4 (where P13+=methylpropyl pyrrolidinium cation) was investigated with specific focus on the phase behaviour and evaluation of transport characteristics. Differential scanning calorimetry (DSC), optical thermomicroscopy, solid state nuclear magnetic resonance (NMR), and AC impedance spectroscopy were used to develop an understanding of the conduction process in the pure and mixed systems. The morphology of the ternary compound appeared as hexagonal spherulites upon solidification. Multinuclear NMR Pulsed Field Gradient measurements (1H,19F,7Li) to probe both cation and anion diffusion coefficients are reported. The anion is shown to be the most diffusive (at 320 K:19F=2.5×10−11 m2 s−1; 1H: 1.8×10−11 m2 s−1; 7Li: 1.1×10−11 m2 s−1) in the ternary compound, with enhanced conductivity (2.7×10−5 S cm−1 at 310 K) just below the melt.

History

Journal

Physical chemistry chemical physics

Volume

5

Issue

24

Pagination

5558 - 5564

Publisher

Royal Society of Chemistry

Location

Cambridge, England

ISSN

1463-9076

eISSN

1463-9084

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2003, Owner Societies