全钒液流电池关键传输参数的实验确定及全电池数值模拟研究

项目名称： 全钒液流电池关键传输参数的实验确定及全电池数值模拟研究

项目编号： No.51306076

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 徐谦

作者单位： 江苏大学

项目金额： 25万元

中文摘要： 目前全钒液流电池的性能和系统效率还未达预期目标，一个主要的原因是电池运行过程中的传质极化过大。电池多孔电极内的传质和电化学反应过程紧密耦合，是个多尺度非线性的复杂问题，迄今对其缺乏广泛深入的研究。针对该情况，本项目拟开展实验和数值模拟的研究。设计并建立一个电化学通用实验平台，用电化学的方法精确确定全钒液流电池多孔电极内的关键传质参数，如有效扩散系数，微孔尺度传质系数，离子淌度等。相比现有的结果，本项目测得的参数将包含更多实际影响因素（如考虑弥散效应对有效扩散系数的影响），具有清晰的物理意义。利用测得的关键传质参数，我们将建立一个完整的包含耦合的传质和电化学反应的数值模型，并模拟全钒液流电池的运行条件、电极材料属性及流场板对电池性能和系统效率的影响。通过分析模拟结果，提出提高性能和改进效率的方案并据此建立一个小型的演示电池。该项目对提高储能系统效率，促进可再生能源利用有重要的意义。

中文关键词： 全钒液流电池；传输参数；实验设计；数值模拟；

英文摘要： Nowadays, the performance and system efficiency of the vanadium redox flow battery (VRFB) are far from the initial anticipation. One of the main reasons is that the mass transport polarization is too large during the practical operating. In fact, the mass transport process is closely coupled with the electrochemical reactions within the porous electrode. These coupled behaviors are multi-scale and strongly nonlinear, such that the comprehensive and in-depth research works on them have not appeared until now. Based on this situation, in this project we plan to carry out both experimental and numerical studies. A versatile electrochemical testing platform will be designed and fabricated, by using which some key transport parameters within the porous electrode of a VRFB, i.e. the effective diffusivity of vanadium ions, pore-scale mass transfer coefficient and ion mobility in the electrolyte, will be accurately determined. Compared with the existing correlations, our results include the influences of the realistic factors (e.g. the dispersion effect is included in the effective diffusivity), showing clear physical meanings. With the aid of the measured key transport parameters, we will then develop a comprehensive numerical model to describe the coupled mass transport and electrochemical processes within the porous

英文关键词： vanadium redox flow battery；transport parameters；experimental designs；numerical modeling；