Characterisation of ion transport in sulfonate based ionomer systems containing lithium and quaternary ammonium cations
2015; Elsevier BV; Volume: 175; Linguagem: Inglês
10.1016/j.electacta.2015.03.218
ISSN1873-3859
AutoresYogita V. Oza, Douglas R. MacFarlane, Maria Forsyth, Luke A. O’Dell,
Tópico(s)Advanced Battery Materials and Technologies
ResumoTwo sulfonated ionomers based on poly(triethylmethyl ammonium 2-acrylamido-2-methyl-1-propane sulfonic acid) (PAMPS) and containing mixtures of Li+ and quaternary ammonium cations are characterised. The first system contains Li+ and the methyltriethyl ammonium cation (N1222) in a 1:9 molar ratio, and the 7Li NMR line widths showed that the Li+ ions are mobile in this system below the glass transition temperature (105 °C) and are therefore decoupled from the polymer segmental motion. The conductivity in this system was measured as 10−5 S cm−1 at 130 °C. A second PAMPS system containing Li+ and the dimethylbutylmethoxyethyl ammonium cation (N114(2O1)) in a 2:8 molar ratio showed much lower conductivities despite a significantly lower Tg (60 °C), possibly due to associations between the Li+ and the ether group on the ammonium cation, or between the latter cations and the sulfonate groups.
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