Evaluation of ZnO nanorod arrays with dandelion-like morphology as negative electrodes for lithium-ion batteries

摘要

In this study, ZnO nanorod arrays have been evaluated for the negative electrodes of lithium-ion batteries. The ZnO nanorod arrays with dandelion-like morphology were directly grown on copper substrates by a hydrothermal synthesis process at 80 ℃. X-ray diffraction, scanning electron microscopy, galvanostatic discharge-charge, and cyclic voltammetry were employed to characterize the structure and electrochemical property of the arrays. The array electrodes showed a stable capacity over 310mAhg{sup} after 40 cycles, and good capacity retention as the anodes of lithium-ion batteries. It was believed that the unique dandelion-like binary-structure played an important role in the electrochemical performance of the array electrodes. The present finding opens the possibility to fabricate microanometer hierarchical ZnO films that might be applied in lithium-ion batteries.