The design of functional and soft ionotronic devices has gained a considerable interest over the last decade, with applications ranging from sensing and energy harvesting to drug delivery. The coupled electrochemical and mechanical response of soft ionic polymers plays a pivotal role in the operation of many such devices and presents a significant challenge for design evaluation. In our new publication in the Journal of the Mechanics and Physics of Solids, we report on a multiphysics model and a finite element approach for solving electro-chemo-mechanical problems. This computational study led by Nikola Bosnjak and Max Tepermeister investigates the mechanisms underlying the operation of ionotronic devices, and paves the way for reliable development of novel devices through finite element analysis.