Thermal behaviors and energy conversion efficiency for all-vanadium flow battery based on thermodynamics entropy analysis

被引:7
作者
Wang, Qian [1 ]
Chen, Wei [1 ]
机构
[1] Shanghai Maritime Univ, Sch Merchant Marine, Shanghai 201306, Peoples R China
关键词
Thermodynamics; Power consumption and resistance heat; Numerical analysis; Entropy generation rate; Energy conversion efficiency; MODEL; TEMPERATURE; PERFORMANCE; CAPACITY; POROSITY;
D O I
10.1016/j.jelechem.2022.116455
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
All-vanadium flow battery mainly relies on the conversion of chemical and electric energy to realize power storage and utilization, but there will inevitably be heat loss coming from the power consumption and resistance heat in the process of energy conversion. Herein, from the perspective of the thermodynamics, the impacts of entropy generation rates on the efficiencies of the battery under different porosities, electrolyte flow rates, current densities and electrolyte concentrations are analyzed, in the cases that the larger average rate of entropy generation will lead to lower voltage efficiency and energy efficiency. The power consumption in the negative electrode is higher than that in the positive electrode in discharge, and the Joule heating in the positive electrode is higher than that in the negative electrode. The entropy generation rate affected by the activation overpotential and transfer current density drops with the increase in electrolyte flow rate, ionic concentration and the decrease in current density. In the mode with the electrodes of different electrode porosities, system efficiency can be used to evaluate the energy conversion efficiency of the battery more accurately as the pump work is included, and the maximum system efficiency of 86.01% can be obtained in the battery with the electrode porosity of epsilon = 0.8.
引用
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页数:14
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