Method for improving performance of ferrovanadium redox flow battery
By adding sulfonates to the non-blend system electrolyte of the ferrovana flow battery, the problems of low efficiency and serious ion interpenetration of the ferrovana flow battery are solved, and higher battery performance and lower capacity attenuation rate are achieved.
CN119674155APending Publication Date: 2025-03-21SHANGHAI ELECTRIC ANHUI ENERGY STORAGE TECH CO LTD +1
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Patent Information
- Application Number
- CN202411688488.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-03-21
AI Technical Summary
Technical Problem
The low efficiency of iron and vanadium flow battery bank is and the serious ion interpenetration phenomenon is caused by capacity attenuation.
Method used
The sulfonate is added as the positive and negative electrode electrolyte additive to the non-blend system iron vanadium electrolyte, thereby improving the stability of the electrolyte.
Benefits of technology
It significantly improves the Coulombic efficiency of the iron-vana flow battery, reduces the capacity attenuation rate, and makes the battery run more stable under high current density.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention discloses a method for improving the performance of a ferrovanadium redox flow battery, and relates to the technical field of redox flow batteries. According to the method, sulfonates are added into a non-blending system ferrovanadium electrolyte system, the method comprises the following steps: taking 500mL of a ferrovanadium electrolyte positive electrode and 500mL of a ferrovanadium electrolyte negative electrode, and adopting the sulfonates as a positive electrode electrolyte additive and a negative electrode electrolyte additive; adding 1-20mmol / L sulfonated substance additive at room temperature, fully stirring until the sulfonated substance additive is completely dissolved, and then respectively taking the sulfonated substance additive as positive and negative electrolyte of the ferrovanadium redox flow battery; after the battery is assembled, the electrolyte is subjected to a charge and discharge test, constant-current charge and discharge are carried out at the current density of 100mA / cm < 2 >, the charge cut-off voltage is 1.3 V, and the discharge cut-off voltage is 0.6 V; and after 150 times of charging and discharging test cycles, the influence of the additive on the battery performance and the electrolyte stability is verified. By adding a proper amount of the sulfonate additive, the battery performance is greatly improved, the coulombic efficiency of the ferrovanadium redox flow battery can be improved to 99%, and meanwhile, the influence on the viscosity and the conductivity of the electrolyte is extremely limited.
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