Water content in solid polymer electrolytes: the lost knowledge

We reproducibly quantify the water content in different SPE systems through various processing/drying conditions and tie the residual amounts of water to heightened ionic conductivities. Moreover, we emphasise on the need to control the sample preparation and isolation as hydration occurs instantly when the dried sample encounters air. As only a few thousand ppm of water can lead to a large overestimation of the ionic conductivity, the systematic quantification of the water content in solid polymer electrolytes appears mandatory.