Nitrogen-doped hierarchical carbon spheres derived from MnO2-templated spherical polypyrrole as excellent high rate anode of Li-ion batteries

作者：Jiang, Chunhai^*; Wang, Jingxia; Chen, Zhonghui; Yu, Zhiyang; Lin, Zhenyu; Zou, Zhimin^*

来源：Electrochimica Acta, 2017, 245: 271-278.

DOI：10.1016/j.electacta.2017.05.157

• Li-ion batteries
• Anode
• Carbon microspheres
• Nitrogen-doping
• Rate performance

Hierarchical nitrogen-doped carbon spheres (NCSs) prepared by annealing the MnO2-templated spherical polypyrrole (PPy) at 450 or 600 degrees C were tested as anode materials of Li-ion batteries. The NCSs annealed at 450 degrees C exhibited higher nitrogen content, more amorphous carbon structure, and lower surface area as compared to the sample annealed at 600 degrees C. The specific capacities and rate performances of both NCSs samples were much higher than that of commercial mesocarbon microbeads (MCMBs). The NCSs annealed at 600 degrees C exhibited higher capacity at low current density (<0.5 A g(-1)) but more rapid capacity decay at elevated current rates referring to the sample annealed at 450 degrees C. The NCSs annealed at higher temperature also possessed inferior cycling stability, possibly due to its lower electronic conductivity and higher degree of graphitization. A high specific capacity of 250.8 mAh g(-1) was achieved on the NCSs annealed at 450 degrees C at 3 A g(-1), demonstrating their high potentiality as anode of high power Li-ion batteries.

• 出版日期2017-8-10
• 单位厦门理工学院; 福州大学