Performance of sodium-ion batteries (IMAGE) National Korea Maritime and Ocean University Caption Researchers in Korea have developed a "heteroatom-doped" (modified) carbon-based anode that helps sodium-ion batteries to surpass the performance of lithium-ion batteries. Credit Korea Maritime and Ocean University 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.