A method for controlling electrolyte migration of positive and negative electrodes of a flow battery
A liquid flow battery and control method technology, which is applied in the direction of fuel cells, electrolyte flow processing, fuel cell additives, etc., can solve the problems of increasing labor costs, time-consuming and laborious, etc., and achieve low cost, easy operation and maintenance, and simple operation methods Effect
Active Publication Date: 2022-04-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
At present, the commonly used liquid flow batteries still use the remixing method to reduce the volume migration of positive and negative electrodes in engineering, but the remixing method is time-consuming and laborious, which increases labor costs.
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Embodiment 1
[0045] In this embodiment, the all-vanadium redox flow battery system uses 1.7 mol / L vanadyl sulfate plus 3.0 mol / L sulfuric acid as the positive and negative electrolytes. First, add 1.7mol / L vanadyl sulfate to 3.0mol / L sulfuric acid, stir evenly, and prepare the original electrolyte; then, electrolyze the electrolyte to obtain positive and negative electrolyte samples corresponding to different SOCs; determine When the battery SOC operating range is 30% to 70%, the viscosity of the positive and negative electrolyte corresponding to 50% SOC is required, and the viscosity of the negative electrolyte is μ - =4.98mPa·s, the viscosity of the positive electrode electrolyte μ + = 4.08 mPa·s. Therefore, the viscosity ratio of the positive and negative electrolytes is 4 / 5, and the volume flow ratio of the positive and negative electrolytes can be set to 5 / 4. If the positive and negative electrolyte volume flow is 50mL min -1 , then the negative electrode electrolyte volume flow rat...
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Abstract
The invention relates to the field of flow batteries, in particular to a method for controlling the migration of positive and negative electrolytes of a flow battery. First, Darcy's law was used to construct the relationship between the volume transfer rate of the positive and negative electrolytes on both sides of the membrane and the pressure difference on both sides of the membrane, and further based on Darcy's law to obtain the relationship between the pressure difference of the positive and negative porous media and the volume flow rate and viscosity of the electrolyte. The relationship between positive and negative electrolyte volume flow, positive and negative electrolyte viscosity, and electrolyte volume migration rate on both sides of the membrane can be effectively established. Based on this, the volume flow ratio of the positive and negative electrolytes is regulated through the viscosity values of the positive and negative electrolytes to achieve effective control of the migration of the electrolytes on both sides of the membrane. The invention makes full use of the physical and chemical properties of the positive and negative electrolytes and the laws of porous media, effectively reduces the migration rate of the electrolyte on both sides of the membrane without introducing complex designs or equipment, and realizes effective control of the capacity decay of the flow battery. Reduce the operation and maintenance cost of the liquid flow battery system.
Description
technical field [0001] The invention relates to the field of flow batteries, in particular to a method for controlling the migration of positive and negative electrolytes of a flow battery. Background technique [0002] Flow battery is one of the preferred technologies for large-scale grid-level energy storage. The capacity fading caused by the volume migration between the positive and negative electrolytes cannot be ignored. Reducing the volume migration between the positive and negative electrodes can effectively Improve the operating life of the flow battery and reduce the cycle cost. At present, the commonly used liquid flow batteries still use the remixing method to reduce the volume migration of positive and negative electrodes in engineering, but the remixing method is time-consuming and labor-intensive, which increases labor costs. [0003] The present invention firstly measures the change law of the viscosity of positive and negative electrolytes with a certain con...
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IPC IPC(8): H01M8/04276H01M8/04746H01M8/04992
CPCH01M8/04276H01M8/04992H01M8/04746Y02E60/50
Inventor 唐奡宋玉玺李享容严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI