Poly(ionic liquid)s represent a promising class of solid-state viscoelastic electrolytes, holding significant potential energy storage applications and advanced materials science. Rather than complexifying their chemical structure to enhance their conductivity, a systematic investigation of simple and model systems by small angle neutron scattering deepens our fundamental understanding of the morphology these materials across a wide range of length scales, paving the way to a broader investigation of their intricate behaviours and properties.