Preparation and electrochemical properties of nanocable-like Nb2O5/surface-modified carbon nanotubes composites for anode materials in lithium ion batteries

摘要

Uniform nanocable-like Nb2O5/surface-modified carbon nanotubes (SMCNTs) composites for anode materials in lithium ion batteries were synthesized by hydrothermal method. It was indicated that Nb2O5 nanoparticles were tightly and uniformly cultivated on carbon nanotubes when CNTs were pretreated with concentrated H2SO4. As a result, Nb2O5/SMCNTs composite materials showed remarkable electrochemical performance as anode materials for lithium-ion batteries. It delivered a high reversible capacity of 441 mA h g(-1) cycled at the current density of 40 mA g(-1) after 100 cycles and an excellent rate capacity of 185 mA h g(-1) at the high current density of 5000 mA g(-1) after 200 cycles. (C) 2017 Elsevier Ltd. All rights reserved.