All-vanadium redox flow battery capacity recovery method

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

Active Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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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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Effect test

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 an all-vanadium redox flow battery capacity recovery method and particularly aims at solving the problem that battery capacity is faded due to accumulation of positive pentavalent vanadium when an all-vanadium redox flow battery operates for a long time. According to the method, appropriate amount of ammonium ferrous sulfate can be added to a positive electrolyte in a battery charge and discharge random process, so the ammonium ferrous sulfate reacts with pentavalent vanadium ions in the positive electrolyte, the pentavalent vanadium ions are restored into tetravalent vanadium ions and a battery capacity is recovered. According to the method, the appropriate amount of ammonium ferrous sulfate is added to the positive electrolyte as reductant, the pentavalent vanadium accumulation problem when the battery operates for a long time, the capacity fading problem is finally solved, so the battery can operates stably for a long time and the electrolyte is efficiently utilized. The method is simple in technology, simple and convenient in operation, low in cost and remarkable in effect; and raw materials are simple and easy to get.

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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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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