Solid state ion transport and phase behaviour in composites of N,N-methyl propylpyrrolidinium tetrafluoroborate and amorphous polyethylene oxide
Data(s) |
01/01/2003
|
---|---|
Resumo |
The binary and ternary addition of 2 wt.% LiBF<sub>4</sub> and 2 wt.% amorphous polyethylene oxide (aPEO) respectively to the plastic crystal forming salt P<sub>13</sub>BF<sub>4</sub> (where P<sub>13</sub><sup>+</sup>=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 (<sup>1</sup>H,<sup>19</sup>F,<sup>7</sup>Li) to probe both cation and anion diffusion coefficients are reported. The anion is shown to be the most diffusive (at 320 K:<sup>19</sup>F=2.5×10<sup>−11</sup> m<sup>2</sup> s<sup>−1</sup>; 1H: 1.8×10<sup>−11</sup> m<sup>2</sup> s<sup>−1</sup>; <sup>7</sup>Li: 1.1×10<sup>−11</sup> m<sup>2</sup> s<sup>−1</sup>) in the ternary compound, with enhanced conductivity (2.7×10<sup>−5</sup> S cm<sup>−1</sup> at 310 K) just below the melt.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Royal Society of Chemistry |
Relação |
http://dro.deakin.edu.au/eserv/DU:30030105/forsyth-solidstateion-2003.pdf http://dx.doi.org/10.1039/B306412N |
Direitos |
2003, Owner Societies |
Tipo |
Journal Article |