Question

What makes ionic conduction fast or slow?

Answer 1

Sometimes in certain electric circuits (such as in voltaic cells) ions are moved around as well as electrons.  I have a basic understand of what materials (mostly metals) conduct electrons well but what materials conduct ions well? What makes ionic conduction fast or slow?  I have read that molten salts are good ionic conductors and that seems sensible to me because all particles in a molten salt are charge carriers and there is nothing to get in the way of carrying charge. But I don't know much more than that such as what sorts of molten salts would be the best ionic conductors.