Durable high-rate performance of CuO hollow nanoparticles/graphene-nanosheet composite anode material for lithium-ion batteries

摘要

Copper oxide hollow nanoparticles/graphene-nanosheet composites are prepared using the Kirkendall-effect approach. The composites exhibit a durable lifetime cycle at high rates. The reversible capacity of the material attains 640 mAhg~(?1) at 50 mAg~(?1) and the capacity retention is ca. 96% when the current density is increased 10 times. At 1 Ag~(?1) (ca. 1.7 C), the reversible capacity reaches 485 mAhg~(?1) and remains at 281 mAhg?1 after 500 cycles, indicating that the capacity fading is less than 0.4 mAhg~(?1) per cycle. This excellent electrochemical performance can be attributed to the hollow interior of CuO nanoparticles as well as synergistic effect between CuO and graphene.