All-vanadium redox flow battery electrolyte formula and process for inhibiting precipitation of easily precipitated element impurities in electrolyte

An all-vanadium redox flow battery and elemental impurity technology, applied in electrolytes, acidic electrolytes, aqueous electrolytes, etc., can solve the problems of reduced discharge capacity, aggravated self-discharge of the battery system, and unbalanced charge of the negative electrolyte, achieving raw materials and Effect of production cost reduction

Inactive Publication Date: 2020-05-26
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, after the precipitation blocks the flow channel of the pipeline, the difference in the renewal speed of the positive and negative electrode solutions will lead to an imbalance in the charge of the negative electrode electrolyte, which will increase the self-discharge of the battery system and gradually reduce the discharge capacity.
[0003] At the same time, the control and detection methods of some elements are lacking. Once they enter the electrolyte, they are often difficult to get rid of, and their continuous accumulation characteristics make them have a great impact on the system capacity and efficiency. This is why the flow rate of many vanadium battery systems suddenly decreases. One of the main reasons for the rapid decrease in discharge capacity
From the perspective of prac

Method used

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  • All-vanadium redox flow battery electrolyte formula and process for inhibiting precipitation of easily precipitated element impurities in electrolyte
  • All-vanadium redox flow battery electrolyte formula and process for inhibiting precipitation of easily precipitated element impurities in electrolyte
  • All-vanadium redox flow battery electrolyte formula and process for inhibiting precipitation of easily precipitated element impurities in electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The vanadium electrolyte was prepared and operated according to the content of the experimental sample and the control sample in the table below, and the results obtained were as shown in the table below:

[0061]

[0062] The above data and operation results show that after properly amplifying the concentrations of the above 9 types of easy-to-deposit elements, the H 2 SO 4 The system electrolyte, 2kW battery, has experienced more than 190 charge and discharge cycles. The experimental electrolyte system has no significant change in system efficiency compared with the control high-purity vanadium sample battery, indicating that the easy-to-deposit elements are properly released, and the long-term charge and discharge operation of the system. Discharge capacity, Efficiency etc. have no effect.

Embodiment 2

[0064] The vanadium electrolyte was prepared and operated according to the content of the experimental sample and the control sample in the table below, and the results obtained were as shown in the table below:

[0065]

[0066]

[0067] The above data and operation results show that the H 2 SO 4 System electrolyte, 2kW battery, after more than 190 charge and discharge cycles, the experimental electrolyte with the concentration of the above 9 types of easy-to-deposit elements appropriately amplified, the efficiency of the sample electrolyte battery with a higher concentration of deposition elements than the control remains good, and the flow rate is not obvious Changes, the internal resistance of the control electrolyte system has increased significantly, indicating that the elements that are easy to deposit are excessively released, which has a serious impact on the discharge capacity and efficiency of the long-term charging and discharging operation of the system.

Embodiment 3

[0069] The vanadium electrolyte was prepared and operated according to the content of the experimental sample and the control sample in the table below, and the results obtained were as shown in the table below:

[0070]

[0071] The above data and operation results show that after properly amplifying the concentrations of the above group 3 easy-to-deposit elements, the H 2 SO 4 System electrolyte, 10kW battery, after more than 190 charge and discharge cycles, the experimental electrolyte system is 6 points higher than the system efficiency of the control sample battery ( figure 2 ), indicating that the excessive release of easy-to-deposit elements has a serious impact on the discharge capacity and efficiency of the long-term charging and discharging operation of the system.

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Abstract

The invention belongs to the field of inhibition of precipitation of easily precipitated elements in an electrolyte, and discloses an all-vanadium redox flow battery electrolyte formula and process for inhibiting precipitation of easily precipitated element impurities in the electrolyte. According to different precipitation characteristics and precipitation conditions of elements prone to precipitation, the highest limit value which can be borne by electrodes in a vanadium electrolyte and a battery is comprehensively considered, the elements prone to precipitation are controlled according to the concentration upper limit when a certain main group (or subgroup) exists at the same time or exists singly, and a concentration interval for long-time safe operation of the system is given. The content of the easily precipitated elements can be effectively controlled, the stability of the electrolyte is improved, the service life of equipment such as a battery resistor is prolonged, and the cost of the electrolyte is effectively reduced.

Description

technical field [0001] The invention belongs to the field of inhibiting the precipitation of easily precipitated elements in an electrolyte, and in particular relates to a formula and a process for an all-vanadium redox flow battery electrolyte for inhibiting the precipitation of easily precipitated elements and impurities in an electrolyte. Background technique [0002] In the existing all-vanadium redox flow battery electrolyte quality standards, the requirements for impurity metal ions in the electrolyte are single, that is, except for the main element vanadium (V), the content of other elements is kept in a very low range, but its quality There is a lack of understanding and restriction standards for easily precipitated elements in the standard. Some element ions have the characteristics of easy hydrolysis, low solubility, and co-ion precipitation. When they exist in the vanadium electrolyte, they will combine into insoluble substances, oxides or salts under certain cond...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0005H01M2300/0011H01M2300/0091Y02E60/50
Inventor 邹毅高新亮赵叶龙王晓丽陈彦博宋玉波杜新雨王芳王子张华民
Owner DALIAN RONGKE POWER
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