کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1298223 | 1498329 | 2012 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The mechanism of ionic transport in PAN-based solid polymer electrolytes The mechanism of ionic transport in PAN-based solid polymer electrolytes](/preview/png/1298223.png)
The mechanism of ionic transport in PAN based polymer electrolytes with LiBF4 as the Li salt and Al2O3 as ceramic filler is investigated employing a range of advanced solid state NMR methodologies with a special focus on the role of the DMSO employed as a solvent. The residual amount of DMSO present in the samples was found to be virtually independent of the PAN:LiBF4 ratio, but solely dependent on the amount of Li salt ( 1–2 DMSO molecules per equivalent of Li salt). Only a marginal fraction of Li cations seems to be associated with the PAN polymer, identified from a considerable strong 7Li–1H dipolar coupling as exemplified by 7Li–{1H}–CPMAS-REDOR NMR spectroscopy. The majority of Li cations however is involved in a Li(DMSO)1–2 complex and exhibits a rather high mobility which persists down to temperatures of T = 220 K, the same temperature, at which the DMSO and BF4− mobility freezes.
► Mechanism of ion conduction in PAN based electrolytes.
► PAN matrix immobile irrespective of salt and DMSO content.
► Li(DMSO)n as mobile Li species.
Journal: Solid State Ionics - Volume 208, 2 February 2012, Pages 8–16