全钒液流电池电流密度分布特性及其调控机制的研究

项目名称： 全钒液流电池电流密度分布特性及其调控机制的研究

项目编号： No.21506211

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 有机化学

项目作者： 邢枫

作者单位： 中国科学院大连化学物理研究所

项目金额： 21万元

中文摘要： 大规模高效储能是风能、太阳能等可再生能源普及应用的瓶颈技术。全钒液流电池作为大规模高效储能的首选技术之一，大功率电堆开发是一种必然需求。本项目针对电堆在放大过程中电流密度偏离最优值，电流密度分布不均匀加剧所导致的电堆性能下降问题，通过将考虑离子交换膜中离子迁移的三维、瞬态、非等温的全电池结构数学模型和适用于测试全钒液流电池电流密度分布的实验方法相结合，系统的研究电池结构、传质、传热、电化学反应以及多孔电极内流体流动等过程及其耦合作用关系，揭示电流密度的分布特性及影响因素对电流密度分布特性的影响规律,阐明电流密度及其分布均匀性的调控机制，实现对电流密度及其分布均匀性的优化，提出优化设计方法，为电堆放大设计提供理论指导，加快全钒液流电池的产业化进程。

中文关键词： 全钒液流电池；机理模型；优化设计；子电池法

英文摘要： The large-scale efficient energy storage technology is the key technology to solve the problem of unsteady characteristics of renewable energy sources such as wind power and solar energy. Vanadium flow battery(VFB) is one of the preferred techniques for large-scale efficient energy storage. The development of a high-power stack is an inevitable demand. The project will focus on the performance of stacks decline when stacks enlarged, which is due to the deviation from optimal value of current density and uneven distribution of current density. By adopting the combination of a more detailed model and a test method which is suitable for measurement of VFB current density distribution, the project will systematically study the coupling relationship between cell structure, mass-transfer process, heat-transfer process, electrochemical reactions and flow in porous electrode. The effects of different facts on the distribution of current density will be revealed. In order to optimize the value and distribution uniformity of current density, a optimization model will be established based on regulatory mechanism of current density and its distribution uniformity. The method will provide strong theory support for VFB high-powre stack design and accelerate the industrialization process.

英文关键词： vanadium flow battery;mechanism model;optimization design;sub-cell method