Liu Ming, Zhang Zilu, Xie Yunyun, Guo Zhiwei, Feng Hua, Liu Wenyou, Wang Hai
College of Physics and Technology, Guangxi Normal University, Guilin 541004, China.
College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Dalton Trans. 2022 Aug 30;51(34):12855-12865. doi: 10.1039/d2dt02074b.
The search for new electrode materials for sodium-ion batteries (SIBs), especially for enhancing the specific capacity and cycling stability of anodes, is of great significance for the development of new energy conversion and storage materials. Here, a new type of titanium nitride composite anode (TiN@C) coated with 2D carbon nanosheets was prepared for the first time using a rationally designed topochemical conversion approach of interface-confinement. Subsequently, the electrochemical performance and Na storage mechanism of TiN@C as an anode for SIBs was investigated. The quantum-dot-sized TiN anodes exhibited shorter ionic transport pathways, while the 2D ultrathin carbon nanosheets reinforced the structural stability of the composite and provided a high electron transformation rate. As a result, the TiN/C composite anode can deliver a high reversible capacity of 170 mA h g and 149 mA h g after 5000 cycles at a current density of 0.5 A g and 1 A g, indicating excellent electrochemical properties. This work provides new opportunities to explore the convenient and controllable preparation of metal nitride anodes for other energy conversion and storage applications.
寻找用于钠离子电池（SIB）的新型电极材料，特别是用于提高阳极的比容量和循环稳定性，对于新能源转换和存储材料的发展具有重要意义。在此，首次采用合理设计的界面限域拓扑化学转化方法制备了一种涂覆有二维碳纳米片的新型氮化钛复合阳极（TiN@C）。随后，研究了TiN@C作为SIB阳极的电化学性能和储钠机制。量子点尺寸的TiN阳极表现出较短的离子传输路径，而二维超薄碳纳米片增强了复合材料的结构稳定性并提供了高电子转换率。结果，TiN/C复合阳极在0.5 A g和1 A g的电流密度下经过5000次循环后可分别提供170 mA h g和149 mA h g的高可逆容量，表明其具有优异的电化学性能。这项工作为探索用于其他能量转换和存储应用的金属氮化物阳极的便捷可控制备提供了新的机会。
