Using interlaced carbon nanotubes (CNTs) as framework, a novel three-dimensional (3D) networks structured Co(NO3)(2)center dot 6H(2)O@CNTs with superior electrochemical performance is synthesized by an ultrasonic assisted hydrothermal and low-temperature conversion method. In the micro-/nanostructured composite, Co(NO3)(2)center dot 6H(2)O particles, with an average size about 0.7 mu m, are homogeneously embedded in the CNTs 3D networks. The CNT5, with high electronic conductivity and outstanding mechanical flexibility, are effective to keep the stability of Co(NO3)(2)center dot 6H(2)O micro-/nanostructures. Evaluated as anode material for lithium ion batteries, the micro-/nano-structured Co(NO3)(2)center dot 6H(2)0@CNTs exhibits a high reversible capacity of 1460 mAh g at a current density of 50 mA g-(1) after 100 charge/discharge cycles. Even at 1000 mA g-(1,) a superior stable capacity as high as 1089 mAh g(-1) could be maintained after 1000 cycles. The improved reversible capacity, excellent cycling stability, and good rate capability of Co(NO3)(2)center dot 6H(2)O@CNTs can be ascribed to the three dimensional structure and the synergistic effect between Co(NO3)(2)center dot 6H(2)O and CNT5. Therefore, this Co(NO3)(2)center dot 6H(2)O@CNTs micro-/nanocomposite can be considered as an attractive anode candidate in rechargeable lithium ion batteries. (C) 2017 Elsevier B.V. All rights reserved.