双离子嵌入型电容去离子（DEDI）作为电容去离子技术发展革新的产物，凭借其超高的脱盐容量和电荷效率受到业界广泛关注。但如何在保持DEDI脱盐容量的同时，实现其脱盐速率的提升是该技术面临的重要挑战。经过对现有工作的总结及预研实验分析，我们发现流场引起的传质不足是导致DEDI脱盐速率难以提升的关键科学问题。基于前期研究基础，本项目拟围绕DEDI的流场和传质问题展开研究，通过电极微观结构设计和器件改良，构建新型Flow-through DEDI（FT-DEDI）系统，实现对于体系流场分布的调控，解决传质不足问题，达成提升DEDI脱盐速率的目标；在此基础上，综合考虑FT-DEDI流场和双离子嵌入特征，构建针对性的动力学理论模型，阐明流场-传质-脱盐速率间的作用机制，最终实现其脱盐速率的可控提升。本项目的顺利实施将大幅提升DEDI淡化效率，对电化学脱盐的进一步发展及其在海水淡化中的应用具有重要意义。

Dual-ion electrochemical deionization (DEDI), as the next generation of capacitive deionization, has attracted great attention in the desalination community due to its ultra-high desalination capacity and charge efficiency. Yet it is still a big challenge to improve the desalination rate of DEDI while remaining its high desalination capacity. By summarizing the state of the art research of DEDI and analyzing the results from our pre-set experiments, we can conclude that the origin of the DEDI’s low desalination rate is the poor mass transfer caused by its intrinsic flow-field as well as the unclearness of the relationship between flow-field, mass transfer, and desalination kinetics. Based on our previous work, this project will focus on flow field and mass transfer issue of DEDI and aim to: construct an advanced flow-through DEDI (FT-DEDI) system by designing the micro-structure of the faradic flow-through electrodes as well as the flow-mode of the device, solve the poor mass transfer issue by regulating the internal flow-field of the FT-DEDI, and ultimately improve the desalination rate; establish a dynamical model for FT-DEDI by taking both the flow-character and dual-ion-character into consideration, reveal the influence and possible mechanism of flow-field, mass transfer to the desalination kinetics, and ultimately realized the controlled improvement of the desalination rate. Our project is expected to greatly improve the desalination efficiency of DEDI and is believed to have great significance in the further development of electrochemical desalination and their application in seawater desalination.