Two-Dimensional Titanium Carbonitride Mxene for High-Performance Sodium Ion Batteries

作者：Jingwen Zhu, Ming Wang, Miaoqiang Lyu, Yalong Jiao, Aijun Du, Bin Luo, I. Gentle, Lianzhou Wang · 发表于：ACS Applied Nano Materials · 年份：2018 · DOI：10.1021/acsanm.8b01330 · 被引用次数：135 · 研究领域：MXene and MAX Phase Materials、Advancements in Battery Materials、Ferroelectric and Negative Capacitance Devices

Two-dimensional layered MXenes are attractive materials for energy storage devices due to their superior electrochemical performance and encouraging capacitances as anode materials in sodium ion batteries (SIBs). Herein, we report the use of Ti 3 CN as a new promising anode material in SIBs and the interfacial kinetic properties of Ti 3 CN electrodes. The Ti 3 CN electrode delivered a high specific capacity of 507 and 211.5 mAh g –1 for the first discharge/charge process, respectively, at a current density of 20 mA g –1 . When tested at 500 mA g –1, the discharge specific capacity of the Ti 3 CN electrode was 98.9 mAh g –1, which is 1.65 times as much as that of pristine Ti 3 C 2 . The density functional theory (DFT) calculations demonstrate that the introduction of more electronegative nitrogen into the lattice grid of Ti 3 C increases the electron count of MXenes. The significantly improved capacities and long-term cycling performance of Ti 3 CN compared to those of its counterpart Ti 3 C 2 SIBs indicate that Ti 3 CN can be considered promising anode materials for sodium-based energy storage devices.