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Method for eliminating impurity influence of all-vanadium redox flow battery electrolyte

An all-vanadium redox flow battery and electrolyte technology, applied in the field of flow batteries, can solve the problems of inability to completely remove the influence of impurities, limited quantity and type of impurities, and increased cost of removing impurities, so as to achieve rich raw materials, simple methods, and extended periods of time. effect of life

Inactive Publication Date: 2017-08-01
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 1. The number and types of impurities removed are limited, and the impact of impurities on the electrolyte cannot be completely removed; 2. The impurity removal steps are cumbersome, requiring a large amount of professional equipment and high-purity reagents; The cost of removing impurities in the low electrolyte will increase exponentially; 4. The influence of impurities introduced in the subsequent production, construction, operation and maintenance process still cannot be ruled out

Method used

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  • Method for eliminating impurity influence of all-vanadium redox flow battery electrolyte
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  • Method for eliminating impurity influence of all-vanadium redox flow battery electrolyte

Examples

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Embodiment 1

[0039] Electrolyte state: sulfate radical concentration 2.0mol / L; vanadium ion concentration 1.6mol / L; impurity elements and Ti ion content 600ppm; complexing agent composition: 2g sodium tripolyphosphate, solid; analytically pure; operating process: at ambient temperature Under the condition of 32°C; add 2g of sodium tripolyphosphate to the positive and negative electrolytes respectively, and stir evenly to fully complex the impurity ions with the complexing agent.

[0040] Battery power: 5W, test instrument: Arbin charge-discharge instrument; charge-discharge mode method: constant current charge-discharge mode; electrolyte solution amount: positive and negative electrodes 80mL each; charge-discharge cut-off voltage: 1.0-1.55V; current density: 80mA / cm 2 , after carrying out 200 charge-discharge cycles, (comparative example is the electrolytic solution that does not add complexing agent, other conditions are identical with embodiment)

[0041] The test results are as follow...

Embodiment 2

[0044]Electrolyte solution state: sulfuric acid concentration 1.5mol / L; hydrochloric acid concentration 1.0mol / L; vanadium ion concentration 1.6mol / L; impurity elements and content Cr ions 200ppm; complexing agent composition: 743g triethanolamine, solid; analytically pure; operating process : At an ambient temperature of 45°C; add 743g of triethanolamine into the positive and negative electrolytes respectively, and stir evenly to fully complex the impurity ions with the complexing agent.

[0045] Battery power: 1kW, test instrument: Arbin charge-discharge instrument; charge-discharge mode method: constant current charge-discharge mode; electrolyte solution amount: positive and negative electrodes 35L each; charge-discharge cut-off voltage: 10.0-15.5V; current density: 80mA / cm 2 , after carrying out 100 charge-discharge cycles, (comparative example is the electrolytic solution that does not add complexing agent, other conditions are identical with embodiment)

[0046] The te...

Embodiment 3

[0049] Electrolyte state: sulfuric acid concentration 2.0mol / L; vanadium ion concentration 1.6mol / L; impurity elements and Mn ion content 150ppm; complexing agent composition: 1875g sodium gluconate, solid; analytically pure; operating process: at an ambient temperature of 45 Under the condition of ℃; add 1875g of sodium gluconate to the positive and negative electrolytes respectively, and stir evenly to fully complex the impurity ions with the complexing agent.

[0050] Battery power: 20kW, test instrument: Arbin charge-discharge instrument; charge-discharge mode method: constant current charge-discharge mode; electrolyte solution amount: positive and negative electrodes 300L each; charge-discharge cut-off voltage: 52.0-80.6V; current density: 80mA / cm 2 , after carrying out 80 charge-discharge cycles, (comparative example is the electrolytic solution that does not add complexing agent, other conditions are identical with embodiment)

[0051] The test results are as follows:...

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Abstract

The invention discloses a method for eliminating impurity influence of an all-vanadium redox flow battery electrolyte. The method comprises the steps of adding a complexing agent into the electrolyte, and fully stirring the electrolyte, wherein the complexing agent is phosphoric acid, inorganic phosphate, hydramine, amino carboxylate, hydroxy carboxylate or organic phosphate. By the method, the steps of impurity elimination during the preparation process of the electrolyte is omitted or reduced, the operation process is simple, the product is rich in raw material, complicated impurity elimination equipment is not needed to be matched, the impurity elimination cost is low, and the method is suitable for application on a large scale; by a mode of adding the complexing agent, impurity metal ions form a complexity body, a reaction electrical pair shifts out of a reaction potential section of an active substance of the all-vanadium redox flow battery electrolyte, the hydrogen evolution promotion effect of the metal ions is eliminated, the hydrogen evolution quantity of the redox flow battery is reduced, the capacity attenuation is reduced, and the lifetime of the redox flow battery is prolonged; and impurity ions introduced during the construction, running and maintenance process of the redox flow battery can be rapidly eliminated, and the method is simple and convenient and is suitable for promotion and application.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to a method for eliminating the influence of impurities in an electrolyte of an all-vanadium redox flow battery. Background technique [0002] Large scale, long life, low cost, and environmental friendliness are the main directions for the development of energy storage technology. In the field of energy storage technologies of various scales including pumped water storage, compressed air energy storage, sodium-sulfur batteries, lithium-ion batteries, lead-acid batteries, etc., the all-vanadium redox flow battery energy storage technology is Large energy scale, good battery uniformity, no pollution, fast response speed, and real-time direct monitoring of its charging and discharging status have become one of the preferred technologies for large-scale energy storage technology. [0003] The all-vanadium redox flow battery is mainly composed of an electric stack, electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M8/04H01M8/04276
CPCH01M8/04H01M8/04276H01M8/18Y02E60/50
Inventor 赵叶龙张华民王晓丽高新亮刘若男
Owner DALIAN RONGKE POWER
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