▎ 摘　　要

A facile and straightforward method was adopted to synthesize ZnCo2O4/graphene nanocomposite anode. In the first step, pure ZnCo2O4 nanoparticles were synthesized using urea-assisted auto-combustion synthesis followed by annealing at a low temperature of 400 degrees C. In the second step, in order to synthesize ZnCo2O4/graphene nanocomposite, the obtained pure ZnCo2O4 nanoparticles were milled with 10 wt% reduced graphene nanosheets using high energy spex mill for 30 s. The ZnCo2O4 nanoparticles, with particle sizes of 25-50 nm, were uniformly dispersed and anchored on the reduced graphene nanosheets. Compared with pure ZnCo2O4 nanoparticles anode, significant improvements in the electrochemical performance of the nanocomposite anode were obtained. The resulting nanocomposite delivered a reversible capacity of 1124.8 mAh g(- 1) at 0.1 C after 90 cycles with 98% Coulombic efficiency and high rate capability of 515.9 mAh g(-1) at 4.5 C, thus exhibiting one of the best lithium storage properties among the reported ZnCo2O4 anodes. The significant enhancement of the electrochemical performance of the nanocomposite anode could be credited to the strong synergy between ZnCo2O4 and graphene nanosheets, which maintain excellent electronic contact and accommodate the large volume changes during the lithiation/delithiation process. (C) 2015 Elsevier Masson SAS. All rights reserved.