The future of electric transport begins with the battery. Attendees of the lecture will learn how lithium batteries and hydrogen fuel cells work, why they need ion-conducting polymer membranes, and how scientists are making them more efficient. In the case of electric transport, progress depends on a thin film that is almost invisible. Polymer membranes help batteries withstand loads, operate more stably, and last longer - which means they affect how fast and how far an electric vehicle can go. The lecture will be conducted by Sofia Morozova - a candidate of chemical sciences and head of the ion-exchange membrane technology laboratory at the MIPT Institute of Electrodynamics. She will discuss the challenges that young researchers are currently working on and why so much attention is given to polymers. The host will explain what a lithium battery consists of: the purpose of the cathode and anode, how the electrolyte and separator are arranged, why the casing is important, and where the polymer membrane fits into this scheme. Hydrogen fuel cells will also be covered to clarify how different technologies solve the same problem - converting chemistry into electricity. Additionally, the lecturer will show samples of electrode materials and structural elements that are usually hidden inside batteries. Attendees will be able to hold the parts, examine the texture, and imagine how they work together. Where to go in Moscow on the weekend will be suggested by our website.