Crystal Power (IMAGE) DOE/Argonne National Laboratory Caption A composite image shows voltage curve on charge of sodium-iridium oxide cathode, microstructures formed at different voltages, and single crystals grown for test cells. Credit Argonne National Laboratory Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.