Batteries have become an essential component of our daily life. They power our smartphones, laptops, tablets, and many of the cars around us. They are also key to the renewable energy transition. Building better batteries requires the design of materials whose chemical composition and structure evolve drastically on charge and discharge, yet those changes must be perfectly reversible for the device to sustain hundreds or thousands of charge-discharge cycles. Raphaële Clément, Associate Professor of Materials Department at UC Santa Barbara, explains why this is a challenging task that necessitates an atomic-level understanding of the inner workings of battery materials. Clément is working to establish materials design rules and optimize materials processing approaches to advance electrochemical energy storage. (#41031)