MoS2 Nanoflowers with Expanded Interlayers as High‐Performance Anodes for Sodium‐Ion Batteries |
| |
Authors: | Zhe Hu Lixiu Wang Dr. Kai Zhang Dr. Jianbin Wang Prof. Fangyi Cheng Prof. Zhanliang Tao Prof. Jun Chen |
| |
Affiliation: | Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University, Tianjin 300071 (China) |
| |
Abstract: | MoS2 nanoflowers with expanded interlayer spacing of the (002) plane were synthesized and used as high‐performance anode in Na‐ion batteries. By controlling the cut‐off voltage to the range of 0.4–3 V, an intercalation mechanism rather than a conversion reaction is taking place. The MoS2 nanoflower electrode shows high discharge capacities of 350 mAh g?1 at 0.05 A g?1, 300 mAh g?1 at 1 A g?1, and 195 mAh g?1 at 10 A g?1. An initial capacity increase with cycling is caused by peeling off MoS2 layers, which produces more active sites for Na+ storage. The stripping of MoS2 layers occurring in charge/discharge cycling contributes to the enhanced kinetics and low energy barrier for the intercalation of Na+ ions. The electrochemical reaction is mainly controlled by the capacitive process, which facilitates the high‐rate capability. Therefore, MoS2 nanoflowers with expanded interlayers hold promise for rechargeable Na‐ion batteries. |
| |
Keywords: | electrochemical exfoliation expanded layers MoS2 pseudocapacitance sodium‐ion batteries |
|
|