Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1612260 | Journal of Alloys and Compounds | 2014 | 5 Pages |
•Onion-like carbon–coated CuO nanocapsules have been synthesized.•Onion-like carbon leads to the improved stability and electric conductivity.•CuO/C nanocapsules maintain a reversible capacity of 628.7 mA h g−1 after 50 cycles.
The synthesis and characterization of CuO/C nanocapsules for application as anode material in lithium ion batteries are reported. Introduction of onion-like carbon shell on the CuO nanoparticles leads to the improved stability, electric conductivity and electrochemical performance. When evaluated as potential anode materials for lithium-ion batteries, the novel CuO/C nanocapsules deliver an initial discharge capacity of 1043.9 mA h g−1 at 100 mA g−1 and maintain a high reversible capacity of 628.7 mA h g−1 after 50 charge–discharge cycles, much higher than those of the CuO nanoparticles. A postmortem analysis of the CuO and CuO/C anodes subjected to prolonged cycling reveals the existence of a lower degree of surface cracking and particle breakage in the CuO/C anode than the CuO anode.