Catalytic Defect‐Repairing Using Manganese Ions for Hard Carbon Anode with High‐Capacity and High‐Initial‐Coulombic‐Efficiency in Sodium‐Ion Batteries

Abstract Hard carbon (HC) anodes have shown extraordinary promise for sodium‐ion batteries, but are limited to their poor initial coulombic efficiency (ICE) and low practical specific capacity due to the large amount of defects. These defects with oxygen containing groups cause irreversible sites for Na + ions. Highly graphited carbon decreases defects, while potentially blocking diffusion paths of Na + ions. Therefore, molecular‐level control of graphitization of hard carbon with open accessible channels for Na + ions is key to achieve high‐performance hard carbon. Moreover, it is challenging to design a conventional method to obtain HCs with both high ICE and capacity. Herein, a universal strategy is…

• IR
  Innovative Research Group Project of the National Natural Science Foundation of China

  Award: 52171217
• NN
  National Natural Science Foundation of China

  Awards: 52202286, 52101265, 51971124, 52250710680, 52171217
• NS
  Natural Science Foundation of Zhejiang Province

  Award: LZ21E010001