利用磁场诱导实现二维Ti3C2基电极材料的有序化及其储钠性能研究

钠离子电池是一种较为理想的大规模储能用锂离子电池的替代技术，但缺乏兼具快速钠离子嵌脱行为和充放电过程中结构稳定的负极材料是限制其快速发展的瓶颈之一。本项目鉴于二维MXene具有优良的导电特性、突出的体积比容量、层间距可调等优势，旨在利用磁场诱导自组装技术构筑具有有序化结构的MXene（Ti3C2Tx）钠电负极材料，以提升其在充放电过程中钠离子传输速率和改善其结构稳定性。项目将系统考察磁场诱导自组装技术-有序化阵列结构-电化学性能三者之间的构效关系；借助铁磁性Fe3O4纳米颗粒作为增强磁场响应的主体材料，系统考察Fe3O4对Ti3C2Tx有序性的增强作用，深入研究有序化结构和电化学性能的作用关系以及剥离Ti3C2Tx和Fe3O4之间的储钠协同作用。优化工艺参数，成功制备出具有优异储能特性的钠电负极材料，为利用磁场诱导自组装技术构筑具有有序化阵列结构的电极材料提供可靠的理论依据和技术支撑。

Sodium-ion batteries are an ideal alternative to lithium-ion batteries for large-scale energy storage. However, the lack of anode materials with fast sodium-ion intercalation and deintercalation and maintaining the stable structure during charge and discharge process restricts the development of sodium-ion batteries. Considering that two-dimensional MXene has many advantages, such as excellent conductivity, high volume capacity and the adjustment of interlayer, MXene (Ti3C2Tx) anode with out-of-plane aligned architecture has been constructed by magnetic alignment approach in order to accelerate the sodium ion transfer rate and improve the structure stability. In this work, we investigate the dependence of the aligned architecture on the magnetically aligned condition and the electrochemical performance. Meanwhile, the Ti3C2/ Fe3O4 anodes with an out-of-plane aligned architecture are prepared by inducing the ferromagnetic Fe3O4 as reinforcing magnetic field response. The enhancement effect of Fe3O4 on the array-ordering have been investigated. We propose the relationship between the order and the electrochemical properties of the composites, and further explored the synergistic effect of Ti3C2 and Fe3O4 nanoparticles. Based on the experimental efforts, we expect to propose great guidance to produce the high performance anode material for sodium-ion batteries which is possess of high volume specific capacity, superior rate capability and excellent cycling stability.