纳微结构MXene（Ti2C/Ti3C2）材料的可控制备与储锂性能基础研究

MXenes（M为过渡金属元素Ti、V、 Cr、 Ta、Nb、Zr、 Mo、 Hf，X为C或N）是一类新型二维纳米层状结构材料，结构与石墨烯类似，且具有优异的电子和离子传输性能，在锂离子电池中表现出巨大的应用前景。本项目以质量较轻的Ti2C和Ti3C2为研究对象，提出设计兼具微米和纳米粒子特性的“纳微结构”，以Ti2AlC和Ti3AlC2为基体，通过“化学刻蚀-机械剥离-水热自组装”合成出由Ti2C或Ti3C2纳米片构成微米球的“纳微结构”材料。重点研究制备过程反应机理，建立制备过程对微观结构的作用机制；解明材料的复杂结构特点，剖析电化学性能，得到材料结构与性能的“构效关系”。通过研究电极过程动力学及带电粒子传输性能，阐明新型纳微结构材料Ti2C和Ti3C2的储锂机理，为研究新型锂离子电池负极材料提供相关技术原型和理论参考。

The layered ternary carbides and nitrides named “MXenes”(M=Ti, V, Cr, Ta, Nb, Zr, Mo, Hf, X=C, N) are kinds of two dimensional materials. The novel structure is similar with graphene material. It has exhibited great potential in a variety of applications especially in electrode materials due to their unique combination of metallic and ceramic properties. Ti2C and Ti3C2 with a special nano-micro structure is designed, and it is synthesized through a “chemical etching-mechanical exfoliation-hydrothermal self-assembly” method by using Ti2AlC and Ti3AlC2 as raw material. The reaction mechanism, structure characteristics, microstructure control, electrochemical performance and Li+ storage mechanism are going to be studied. This research will clarify the reaction mechanism, the relationship between structure properties and the electrochemical performance, and to acquire the Li+ storage performances and the mechanism of kinetics of Li+ extraction/insertion process.