Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6613086 | Electrochimica Acta | 2014 | 7 Pages |
Abstract
Amorphous MoOx (a-MoOx, 2 < x < 3) thin films were deposited by a reactive magnetron sputtering method. As the Li-ion storage electrodes, the a-MoOx thin films exhibit a high capacity of 338 μAh·cmâ2 (about 845 mAh·gâ1) at a current density of 90 μA cmâ2 even after 100 electrochemical cycles, and have a rate capacity of 158 μAh cmâ2 at a high current density of 2000 μA cmâ2. The phase analysis revealed that all the a-MoOx thin films maintained an amorphous characteristic after having been charged-discharged at various stages. In-situ electron-beam irradiation (EBI) induced crystallization of the a-MoOx thin films was performed by using a transmission electron microscopy. By analyzing the EBI induced crystalline phases of the a-MoOx thin films, the possible electrochemical reactions during the charge-discharge processes were discussed. According to the developed investigation method, the possible electrochemical mechanism in the a-MoOx thin films were proposed to undergo a conversion reaction such as MoOx + 2xLi+ + 2xeâ â Mo + xLi2O during the electrochemical processes.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Wenhao Chen, Hong Zhang, Ying Wang, Zhiyuan Ma, Zhicheng Li,