SnO_2-based composite coaxial nanocables with multi-walled carbon nanotube and polypyrrole as anode materials for lithium-ion batteries

摘要

SnO_2-based composite coaxial nanocables with multi-walled carbon nanotube (MWCNT) and polypyrrole (PPy), SnO_2@MWCNT@SnO_2@PPy have been successfully synthesized via a simple one-pot chemical route. Such a novel nanostructure can not only provide a high conductivity, but also effectively suppress mechanical stress and prevent aggregation of SnO_2 nanoparticles, leading to the improvement in the electrochemical utilization and cycling stability of SnO_2 during Li-storage reaction. As anode materials, the as-obtained coaxial nanocables show a reversible capacity as high as 600 mAh g~(?1) and a coulombic efficiency close to 100%, which is potential for practical application in lithium-ion batteries.