Abstract
? 2022 Elsevier B.V.To improve the electrochemical performance of thin films based on Zn0.4Ni0.6O (ZNO) solid solution compound (SSC), Li-decorated ZNO [(Zn0.4Ni0.6)0.95Li0.05O, ZNLO] SSC was designed in this work. ZNO and ZNLO nanostructured thin films were prepared by RF magnetron sputtering with related lab-made ceramic targets. Phase composition, element valences, microstructure, electrochemical properties and electrochemically-induced phase evolution of the thin films were investigated. The cells assembled with ZNLO thin films as electrode deliver high reversible specific capacity of 773 mAh g?1 at 200 mA g?1 after 200 cycles, which is extremely superior to that of the ZNO thin film (363 mAh g?1). ZNLO thin film shows a high rate performance with specific capacity of 511 mAh g?1 at 1000 mA g?1 even after 750 cycles. The electrochemically induced phase evolution was studied by transmission electron microscopy, and the results revealed that nearly complete redox conversions of Zn-Ni-O ? Ni/Zn and ZnO ? Zn took place in ZNLO thin films electrode. The high electrochemical performance owes to the enhanced electrical conductivity of thin film doped with Li-ion and nanostructured characteristics of thin film that provide high specific surface and redox conversion processes.
NSTL
Elsevier