摘要
In order to fully excavate Ti 3 C 2 T x 's electrochemical energy storage capability, a combination of cold pressing and annealing treatment is developed to fabricate free-standing Ti 3 C 2 T x MXene films featuring well-defined film structure, planar macropores, in-plane defects and expanded interlayer spacing. The rational construction of microreactors between Ti 3 C 2 T x nanosheets by cold pressing can assist the formation of the planar macropores and in-plane defects of Ti 3 C 2 T x nanosheets under the annealing conditions, whereas the annealing process could regulate the functional groups of Ti 3 C 2 T x nanosheets to significantly expand their interlayer spacing. These structural advantages not only can prevent self-restacking of Ti 3 C 2 T x nanosheets, but also can increase the ion and electrolyte diffusion as well as the utilization of electrochemically active sites. The as-prepared PF-Ti 3 C 2 T x -500, pre-pressed at 6 MPa followed by an annealing treatment at 500 °C in H 2 /Ar, exhibits excellent characteristics as the lithium storage anode, such as an enhanced initial Coulombic efficiency (CE) of 77.3%, a high areal capacity (2.22 mA h cm −2 at 7.52 mg cm −2 for 500 cycles), and stable long cycling performance. This work demonstrates the important role of microstructure manipulation of Ti 3 C 2 T x MXene on their electrochemical performance and can guide future work on designing high-performance MXene-based materials for energy storage applications.
| 源语言 | 英语 |
|---|---|
| 页（从-至） | 11-23 |
| 页数 | 13 |
| 期刊 | Electrochimica Acta |
| 卷 | 305 |
| DOI | |
| 出版状态 | 已出版 - 10 5月 2019 |
