Investigation of the use of electrolyte viscosity for online state-of-charge monitoring design in vanadium redox flow battery

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	Investigation of the use of electrolyte viscosity for online state-of-charge monitoring design in vanadium redox flow battery
	Li, XR; Xiong, J; Tang, A; Qin, Y; Liu, JG; Yan, CW; Tang, A (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang, Liaoning, Peoples R China.
刊名	APPLIED ENERGY
	2018-02-01
卷号	211 页码:1050-1059
关键词	Model
ISSN号	0306-2619
英文摘要	In vanadium redox flow batteries, an accumulated imbalance of the states-of-charge between the two half-cell electrolytes caused by vanadium ion crossover and gassing side reactions can result in only one half-cell achieving 100% state-of-charge, which is referred to as capacity loss that needs to be corrected online. In order to implement rebalancing control, online states-of-charge have to be monitored. In this paper, the electrolyte viscosity and its use for online state-of-charge monitoring design are investigated. The study firstly measures the viscosities of both V2+/V3+ and VO2+/VO2+ redox couples in sulfuric acid as the negative and positive half-cell electrolytes at different states-of-charge and temperatures, followed by establishing an empirical neural network model that correlates the state-of-charge to viscosity and temperature. To overcome the limitation in online viscosity measurements, Darcy's law describing the flow of a fluid through a porous medium is further introduced to link the electrolyte viscosity to the pressure drop across a porous medium where the electrolyte solutions flow through. Together with the neural network model, the state-of-charge can be eventually represented as a function of pressure, temperature and flow rate that are readily measurable online, and accordingly an online state-of-charge monitoring design is developed, which could be readily integrated into the online battery control system for automated electrolyte rebalance. Experimental validation is performed on a 15 cell stack system and the results demonstrate the feasibility of the proposed method.; In vanadium redox flow batteries, an accumulated imbalance of the states-of-charge between the two half-cell electrolytes caused by vanadium ion crossover and gassing side reactions can result in only one half-cell achieving 100% state-of-charge, which is referred to as capacity loss that needs to be corrected online. In order to implement rebalancing control, online states-of-charge have to be monitored. In this paper, the electrolyte viscosity and its use for online state-of-charge monitoring design are investigated. The study firstly measures the viscosities of both V2+/V3+ and VO2+/VO2+ redox couples in sulfuric acid as the negative and positive half-cell electrolytes at different states-of-charge and temperatures, followed by establishing an empirical neural network model that correlates the state-of-charge to viscosity and temperature. To overcome the limitation in online viscosity measurements, Darcy's law describing the flow of a fluid through a porous medium is further introduced to link the electrolyte viscosity to the pressure drop across a porous medium where the electrolyte solutions flow through. Together with the neural network model, the state-of-charge can be eventually represented as a function of pressure, temperature and flow rate that are readily measurable online, and accordingly an online state-of-charge monitoring design is developed, which could be readily integrated into the online battery control system for automated electrolyte rebalance. Experimental validation is performed on a 15 cell stack system and the results demonstrate the feasibility of the proposed method.
学科主题	Energy & Fuels ; Engineering, Chemical
语种	英语
资助机构	National Nature Science Foundation of China [21373009, 21403254, 21706266]; Institute of Metal Research, Chinese Academy of Sciences [Y6F1A111A1]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79544]
专题	金属研究所_中国科学院金属研究所
通讯作者	Tang, A (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Li, XR,Xiong, J,Tang, A,et al. Investigation of the use of electrolyte viscosity for online state-of-charge monitoring design in vanadium redox flow battery[J]. APPLIED ENERGY,2018,211:1050-1059.
APA	Li, XR.,Xiong, J.,Tang, A.,Qin, Y.,Liu, JG.,...&Tang, A .(2018).Investigation of the use of electrolyte viscosity for online state-of-charge monitoring design in vanadium redox flow battery.APPLIED ENERGY,211,1050-1059.
MLA	Li, XR,et al."Investigation of the use of electrolyte viscosity for online state-of-charge monitoring design in vanadium redox flow battery".APPLIED ENERGY 211(2018):1050-1059.