Na‐Mn‐O Nanocrystals as a High Capacity and Long Life Anode Material for Li‐Ion Batteries

Searching for a new material to build the next‐generation rechargeable lithium‐ion batteries (LIBs) with high electrochemical performance is urgently required. Owing to the low‐cost, non‐toxicity, and high‐safety, the family of manganese oxide including the Na‐Mn‐O system is regarded as one of the most promising electrode materials for LIBs. Herein, a new strategy is carried out to prepare a highly porous and electrochemically active Na 0.55 Mn 2 O 4 ·1.5H 2 O (SMOH) compound. As an anode material, the Na‐Mn‐O nanocrystal material dispersed within a carbon matrix manifests a high reversible capacity of 1015.5 mA h g −1 at a current density of 0.1 A g −1 . Remarkably, a considerable capability of 546.8 mA h g −1 remains even after 2000 discharge/charge cycles at the higher current density of 4 A g −1 , indicating a splendid cyclability. The exceptional electrochemical properties allow SMOH to be a promising anode material toward LIBs.