Research progress of modification of Ti_(3)C_(2)T_(x) in sodium-ion batteries

改性Ti_(3)C_(2)T_(x)材料在钠离子电池中的研究进展

As a new two-dimensional layered structural material,Ti_(3)C_(2)T_(x)has excellent electrical conductivity,mechanical properties,hydrophilicity and rich functional groups,showing a wide application prospect in the field of energy storage.However,when Ti_(3)C_(2)T_(x)is used as the electrode material of energy storage device,it is easy to stack due to the van der Waals forces between the layers,which hinders the reaction between the surface active site and electrolyte ions,lengthens the path of ion diffusion,and affects its specific capacity and rate performance.To address the above problems,this paper summarizes the research progress of Ti_(3)C_(2)T_(x)surface modification including designing three-dimensional nanostructures,constructing intercalated structural composites(composite with monomers,oxides,sulfides,and selenides),and doping with heteroatoms in sodium-ion batteries,and describes in detail the strategies or mechanisms of battery performance enhancement in conjunction with its preparation methods.Finally,its future research direction and development prospects are envisioned.

Ti_(3)C_(2)T_(x)作为一种新型二维层状结构材料,具有优异的导电性、力学性能、亲水性和丰富的官能团,在储能领域展现出广泛的应用前景。但是Ti_(3)C_(2)T_(x)作为储能器件的电极材料时,由于层间的范德华力使其片层易发生堆叠,从而阻碍了表面活性位点与电解质离子的反应,加长了离子扩散的路径,影响了其比容量和倍率性能。针对上述问题,本文综述了Ti_(3)C_(2)T_(x)表面改性包括设计三维纳米结构、构筑插层结构复合材料(与单质、氧化物、硫化物和硒化物复合)、杂原子掺杂等,在钠离子电池中的研究进展,并结合其制备方法,详细介绍了电池性能提升策略或机制。最后,展望其未来的研究方向和发展前景。