Intercalation of CoO in S-Doped Graphite as High-Performance Anodes for Lithium-Ion Batteries

摘要

The intercalation of CoO nanoparticles (NPs) in S-graphite (labeled as CoO@S-graphite) composite is obtained by a one-step doping reaction between graphite and CoSO4 in a fluidized bed reactor. CoO@S-graphite presents increased specific surface area and higher intensity ratio of the D to Gband compared with the pristine graphite owing to the etching effect during the calcination treatment. As an anode material for lithium-ion batteries, the enhanced energy-storage ability of the as-synthesized compound is a result of the S doping and CoO NPs intercalation, which not only contributes to enhancing the rate capability, but also has no impact on the outputs of delithiation capacity and voltage plateau below 0.5 V. The configured CoO@S-graphite/LiFePO4 battery exhibits better rate capability than that based on graphite/LiFePO4 and affords a high reversible capacity of 160 mAhg(-1) at 0.2C and excellent durability.