二维纳米MXenes材料因具有独特的结构在锂离子电池等储能领域具有广阔的应用前景，但如何实现其无氟绿色制备及高效复合改性已成为高性能MXenes复合材料亟待突破的瓶颈问题。本项目拟采用水热碱腐蚀剥离MAX合成MXenes，再水热处理MXenes使原位转变成TiO2(NW)/MXenes与Li4Ti5O12/MXenes三维网络结构复合材料。通过研究腐蚀液种类、含量、反应温度、时间等对MXenes、TiO2纳米线、Li4Ti5O12纳米片合成过程中物相组成与结构演变的影响，揭示碱腐蚀剥离合成MXenes及复合物中TiO2纤维及二维Li4Ti5O12低维衍生物的原位生长机制。研究MXenes负载TiO2纤维及Li4Ti5O12对电子及离子传输的影响，阐明对电化学性能的调控机制。项目的实施将为MXenes材料绿色制备及其复合改性提供新思路，为该类材料在电化学储能等领域的应用奠定坚实理论和实验基础。

Two-dimensional (2D) MXenes nanomaterials have broad application prospect in the fields of lithium ion battery and other energy storage devices due to their unique structure, but one urgent bottleneck problem of high performance MXenes-based composites is how to realize the fluorine-free green preparation and high-efficiency composite modification of MXenes. The project proposed to synthesize MXenes by the hydrothermal alkali-etching and exfoliation of MAX, and then in situ transform MXenes into TiO2(NW)/MXenes and Li4Ti5O12/MXenes three-dimensional network structure composites by hydrothermal treatment. By studying the effects of types and concentration of etching solutions, reaction temperature and time on the phase composition and microstructure evolution of MXenes, TiO2 nanowires and Li4Ti5O12 nanosheets, the synthesis mechanism of alkali-etching of MXenes and in-situ growth mechanism low-dimension derivatives such as TiO2 nanowires and two-dimensional Li4Ti5O12 in composites were revealed. The project also studied the effects of TiO2 nanowires and Li4Ti5O12 loaded on MXenes on electron and ion transport, and the regulation mechanism of that on electrochemical properties was clarified. The implementation of the project will provide a new method for the green preparation and composite modification of MXenes, and establish a steady basis in theory and experiment for the application in the field of electrochemical energy storage.