Increase in capacity retention (IMAGE) Hokkaido University Caption Capacity retention of lithium-iron-oxide cathode is improved from 50% to 90% when doped with abundantly available elements such as aluminum, silicon, phosphorus, and sulfur. (Illustration: Hiroaki Kobayashi) Credit Hiroaki Kobayashi Usage Restrictions This image is copyrighted but may be used to report on this press release as long as the copyright holder is credited. License Original 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.