Potential/ Capacity (IMAGE) Shinshu University Caption Galvanostatic charge-discharge profiles of the graphite composite electrode at a current density of 7.44 mA g-1 in the potential range of 0−2.65 V vs. Ag/Ag+. The potential of Ag/Ag+ was converted to the potential of ferrocene/ferrocenium (Fc/Fc+). Credit Masahiro Shimizu, Shinshu University Usage Restrictions The image may only be used with appropriate caption or credit. 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.