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A method for restoring the capacity of an all-vanadium redox flow battery

An all-vanadium redox flow battery and capacity recovery technology, which is used in regenerative fuel cells, secondary battery repair/maintenance, secondary battery charging/discharging, etc. problem, to achieve the effect of easy operation, solving capacity attenuation, and low price

Active Publication Date: 2020-08-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the cross-linking of vanadium ions and the continuous occurrence of side reactions, after a long-term operation of the battery, the vanadium ions in the positive electrolyte may be mainly VO 2 + , the vanadium ions in the negative electrode electrolyte are mainly V 3+ , resulting in an imbalance of effective vanadium ions in the positive and negative electrolytes, and the electrolyte cannot be used normally

Method used

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  • A method for restoring the capacity of an all-vanadium redox flow battery
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Embodiment 1

[0019] After long-term use and discharge of the battery, the battery capacity decays by more than 50%, the coulombic efficiency of the battery is 94.5%, the voltage efficiency is 87.2%, and the energy efficiency is 82.3%. The ion is 0.9mol / L, the tetravalent vanadium ion is 0.7mol / L, the sulfuric acid concentration is 3mol / L, and the electrolyte volume is 100mL; the divalent vanadium ion in the negative electrode electrolyte is 0.04mol / L, and the trivalent vanadium ion is 0.04mol / L. is 1.56mol / L, the sulfuric acid concentration is 3mol / L, and the electrolyte volume is 100mL. During the electrolyte flow process, add 2.5 grams of ferrous ammonium sulfate to the positive storage tank, the concentration of ferrous ammonium sulfate is 0.06mol / L, resume the battery charge and discharge test, the battery capacity returns to 63% of the initial capacity, and the coulombic efficiency is 94.3 %, the voltage efficiency is 87.5%, and the energy efficiency is 82.5%.

Embodiment 2

[0021] After long-term use and discharge of the battery, the battery capacity decays by more than 50%, the coulombic efficiency of the battery is 94.5%, the voltage efficiency is 87.2%, and the energy efficiency is 82.3%. The ion is 0.9mol / L, the tetravalent vanadium ion is 0.7mol / L, the sulfuric acid concentration is 3mol / L, and the electrolyte volume is 100mL; the divalent vanadium ion in the negative electrode electrolyte is 0.04mol / L, and the trivalent vanadium ion is 0.04mol / L. is 1.56mol / L, the sulfuric acid concentration is 3mol / L, and the electrolyte volume is 100mL. During the flow of the electrolyte, add 7.5 grams of ferrous ammonium sulfate to the positive storage tank, the concentration of ferrous ammonium sulfate is 0.2mol / L, resume the battery charge and discharge test, the battery capacity returns to 76% of the initial capacity, and the coulombic efficiency is 94.6 %, the voltage efficiency is 87.2%, and the energy efficiency is 82.5%.

Embodiment 3

[0023] After long-term use and discharge of the battery, the battery capacity decays by more than 50%, the coulombic efficiency of the battery is 94.5%, the voltage efficiency is 87.2%, and the energy efficiency is 82.3%. The ion is 0.9mol / L, the tetravalent vanadium ion is 0.7mol / L, the sulfuric acid concentration is 3mol / L, and the electrolyte volume is 100mL; the divalent vanadium ion in the negative electrode electrolyte is 0.04mol / L, and the trivalent vanadium ion is 0.04mol / L. is 1.56mol / L, the sulfuric acid concentration is 3mol / L, and the electrolyte volume is 100mL. During the flow of the electrolyte, add 10 grams of ferrous ammonium sulfate to the positive storage tank, the concentration of ferrous ammonium sulfate is 0.26mol / L, resume the battery charge and discharge test, the battery capacity returns to 80.7% of the initial capacity, and the coulombic efficiency is 94.7 %, the voltage efficiency is 87%, and the energy efficiency is 82.4%.

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Abstract

The invention relates to a method for restoring the capacity of an all-vanadium redox flow battery, in particular to solve the problem of battery capacity attenuation due to the accumulation of pentavalent vanadium at the positive electrode during the long-term operation of the all-vanadium redox flow battery. This method can add an appropriate amount of ammonium ferrous sulfate to the positive electrode electrolyte in any process of charging and discharging the battery. Tetravalent vanadium ions restore battery capacity. The invention solves the problem of accumulation of pentavalent vanadium during long-term operation of the battery by adding an appropriate amount of ammonium ferrous sulfate as a reducing agent in the positive electrolyte, so as to finally solve the problem of capacity fading, and realize long-term stable operation of the battery and high efficiency of the electrolyte use. The invention has the advantages of simple process, convenient operation, simple and easy-to-obtain raw materials, low cost and remarkable effect.

Description

technical field [0001] The invention relates to the application field of a capacity recovery method for an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery is a new type of energy storage system. Compared with traditional energy storage methods, it has the characteristics of fast charge and discharge response, large and adjustable charging capacity, high battery efficiency, and simple battery structure. In particular, stationary storage of renewable energy has outstanding advantages. The positive and negative electrolyte solutions of all-vanadium redox flow batteries contain solutions of V(Ⅴ) / V(Ⅳ) and V(Ⅲ) / V(II) vanadium compounds respectively. It is not only an active material for energy storage, but also a complete The core of vanadium redox flow battery energy storage and energy conversion. The following reactions occur in the all-vanadium redox flow battery during charging and discharging: [0003] Positive electrode: VO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M8/18
CPCH01M8/18H01M10/44Y02E60/10Y02E60/50
Inventor 史丁秦张华民李先锋孙佳伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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