钾离子嵌入/脱出困难、充放电过程中体积变化大是钾离子电池电极材料设计面临的关键共性问题。本项目从材料的本征特性入手，提出构建ReS2/MXene异质结构作为钾离子电池负极材料。利用ReS2层间距大和层间作用力极弱的特性解决钾离子电池负极材料存在的上述关键问题，利用MXene导电性高、表面极性强、密度高的特性解决ReS2导电性差、多硫化物穿梭效应等问题。构建“三明治型”和“三维阵列型”纳米结构，协同发挥二者的本征特性，获得高体积比容量、高倍率、长循环的钾离子电池负极材料，深入研究其电化学反应机制，阐明ReS2/MXene异质结构促进钾离子嵌入/脱出、抑制体积变化和“穿梭效应”的作用机制，以及对倍率性能、循环稳定性的提升机制，获得该类材料的优化设计原则。基于该类材料构建钾离子全电池，研究其优化组装原理。研究成果将为钾离子电池负极材料设计提供一定的理论依据。

The poor intercalation/deintercalation of large-size potassium ions, as well as the huge volume change of electrode materials is the common and key problem that potassium ion batteries (PIBs) are facing. In this proposal, we will fabricate ReS2/MXene heterostructure as anode materials for PIBs. In these heterostructure materials, the larger interlayer spacing and the extremely weak van der Waals interaction between layers in ReS2 affords new opportunity for solving the massive potassium ions to efficiently diffuse without significant volume expansion, while the MXene support could solve the lack of poor electrical conductivity and polysulfide shuttle for ReS2 due to their high conductivity, strong polar surface and high pristine density. We will try to develop anode materials with high volumetric capacities, high power capability and good cycle stability, study the electrochemical mechanism of the ReS2/MXene heterostructure, and clarify the effect of ReS2/MXene heterostructure on accelerating potassium intercalation/deintercalation, buffering volumetric expanding/shrinking, and elevating rate capability and cycle stability. The principle for optimization design of ReS2/MXene heterostructure will be obtained based on the above research. Finally, we will fabricate the whole PIBs by using ReS2/MXene heterostructure as anode material and Prussian white as cathode material. We think the finding of this research will be much help to the development of anode materials for PIBs.