摘要
液流电池是一种新型的电化学储能系统,正负极全使用钒盐溶液的称为全钒液流电池,简称钒电池.其荷电状态100%时电池的开路电压可达1.5 V.用充放电实验研究全钒液流电池的性能时,有必要确定在充放电过程中电池的荷电状态.钒电池中各种价态离子含量的测定方法有电位滴定和分光光度法,确定正负极溶液中各价态离子含量就可知电池荷电状态.本实验提出用开路电压监测荷电状态的方法.在正负极反应达热力学平衡时电池的开路电压等于电池电动势,利用Nernst方程可求得电池的荷电状态,而且这种测量方法简单,不会造成电池的容量损失,具有实用价值.由紫外-可见光谱证实电解液中的V(Ⅴ)主要以单体形式存在.
A redox flow battery （RFB） is a novel electrochemical power supply in which the chemical species participating in the electrode reaction are soluble. The all-vanadium redox flow batteries （V-RFB） employ V（ Ⅱ ）/V（ Ⅲ ） and V（Ⅳ）/V（ Ⅴ ） redox couples for the negative and positive half-cells and give an attainable open circuit voltage （OCV） of approximately 1.5 V at 100% state of charge （SOC）. It is essential to determine the SOC of＇a vanadium redox flow cell during the charge/discharge cycling. The analysis methods include potentiometric titration and spectrophotometry. Knowing the concentration of vanadium ions we can determine the SOC of the cell. In this paper, the open current potential （OCP） is used to evaluate the SOC. When the reaction of anode and cathode is in thermodynamic balance, the OCP is equal to the electromotive force of the cell, and can be used to calculate the SOC by using Nernst-Equation. The method that is easy and leads to no loss of the capability of cells is useful for the study of flow cells. The UV-Vis absorption spectra confirms that the formation of V（ V ） species are monomers.
出处
《浙江工业大学学报》
CAS
2006年第2期119-122,共4页
Journal of Zhejiang University of Technology
基金
国家自然科学基金资助项目(90510001)
关键词
荷电状态
开路电压
全钒氧化还原液流电池
State of charge（SOC）
open current potential（OCP）
vanadium redox flow cell
