Sodium‐Ion Batteries: Probing the Energy Storage Mechanism of Quasi‐Metallic Na in Hard Carbon for Sodium‐Ion Batteries (Adv. Energy Mater. 11/2021)

In article number 2003854, Ying Bai, Hongcai Gao, Chuan Wu and co-workers provide an in-depth understanding of the steady state of sodium in hard carbon. Due to the electron transfer between carbon and Na-ions, sodium stored in hard carbon exhibits metallic properties, which can be verified by the reaction between protic solvents (ethanol) and metallic sodium.