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Rapid detection method and rapid detection apparatus of all-vanadium flow battery positive electrode side reaction

An all-vanadium redox flow battery and detection device technology, applied in the field of measurement, can solve the problems of cumbersome steps, long time consumption, damage, etc.

Inactive Publication Date: 2015-08-26
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, at present, there is no method that can quickly detect the side reactions of the positive electrode of the vanadium battery, but only after the battery has run some charge-discharge cycles, the changes in the pressure in the positive and negative liquid storage tanks, the results of electrolytic sampling potentiometric titration, or On-line mass spectrometry (Electrochemistry Communications, 2013, 28:58) to estimate the extent of side reactions in vanadium batteries
These methods are cumbersome and time-consuming, which is not conducive to the parameter determination of large-scale vanadium batteries in industrial production.
And after such a long-term charge and discharge test, the side reaction of the positive electrode may have caused irreversible damage to the electrode of the vanadium battery

Method used

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  • Rapid detection method and rapid detection apparatus of all-vanadium flow battery positive electrode side reaction
  • Rapid detection method and rapid detection apparatus of all-vanadium flow battery positive electrode side reaction
  • Rapid detection method and rapid detection apparatus of all-vanadium flow battery positive electrode side reaction

Examples

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no. 1 example

[0100] image 3 is a schematic diagram of the device of the first embodiment of the present invention. It includes a vanadium redox flow battery unit (VRB), an optical detection unit, a signal acquisition and processing unit, and a control unit.

[0101] The all-vanadium redox flow battery unit includes: a positive electrode liquid storage tank 7 storing a positive electrode electrolyte, a negative electrode liquid storage tank 8 storing a negative electrode electrolyte, a battery reaction zone 6, and an absorption pool 2, preferably, a positive and negative electrode liquid storage tank 50ml each of the positive and negative electrolytes with 2mol / L vanadium ions and 4.5mol / L sulfate ions are stored in the battery. The magnetic stirrer stirs the electrolyte inside the liquid storage tank to make it fully mixed.

[0102] The peristaltic pump pumps the positive electrolyte and the negative electrolyte into the battery reaction zone 6 , wherein the positive electrolyte first f...

no. 2 example

[0110] Figure 4 is a schematic flowchart of the method provided by the second embodiment of the present invention.

[0111] The method uses the detection device described in the first embodiment, and includes the steps of:

[0112] Set the default parameters in the detection device;

[0113] Obtaining the first discharge curve of the positive electrode of the all-vanadium redox flow battery under the preset parameters;

[0114] Obtaining a second discharge curve of the positive electrode of the all-vanadium redox flow battery under the preset parameters;

[0115] According to the first discharge curve and the second discharge curve, determine the transmitted light intensity difference corresponding to the positive electrode side reaction of the all-vanadium redox flow battery;

[0116] a) Determine the side reaction of the positive electrode of the all-vanadium redox flow battery under the current parameters;

[0117] b) Judging whether the preset parameters need to be ch...

no. 3 example

[0149] A concrete implementation example is given.

[0150] Figure 8 It is the original data of positive electrode side reaction ratio under different flow rates and charging current densities measured in the present invention. Among them, (a)-(d) are the data measured under the flow rates of 20, 40, 60, and 80 ml, respectively. In each set of data, first fill the positive electrode electrolyte to the maximum transmitted light intensity (100% charging state), and then use 40, 80, 120, 160, 200mA / cm 2 The constant current discharge and constant current charge of 0.03Ah are performed on it with a current density of 0.03Ah. Among them, after charging and discharging, there is a period of shelving to stabilize the light intensity of the electrolyte, and there is a charging process between different current measurements to restore the transmitted light intensity of the electrolyte to the maximum value. After measuring the current density of each group, the battery is left to me...

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Abstract

The present invention relates to a rapid detection method and a rapid detection apparatus of an all-vanadium flow battery positive electrode side reaction. The method comprises: acquiring the first discharging curve of an all-vanadium flow battery positive electrode electrolyte under preset parameters; acquiring the second discharging curve of the all-vanadium flow battery positive electrode electrolyte under preset parameters; according to the first discharging curve and the second discharging curve, determining the transmitted light intensity difference corresponding to the all-vanadium flow battery positive electrode side reaction; and determining the proportion of the all-vanadium flow battery positive electrode side reaction under the current parameter. With the method and the apparatus of the present invention, the proportion of the positive electrode side reaction of the vanadium battery under different parameters can be rapidly measured, the optimal vanadium battery parameter can be determined, and the basis is established for the determination of the parameters of the large-batch vanadium batteries in the industrial production.

Description

Technical field: [0001] The invention belongs to the technical field of measurement, and in particular relates to a method and a device for rapidly detecting the degree of positive electrode side reactions of an all-vanadium redox flow battery based on transmitted light intensity. Background technique: [0002] Vanadium redox flow battery (Vanadium Redox Flow battery, referred to as VRB or vanadium battery) was invented in the 1980s (Journal of The Electrochemical Society, 1986,133:1057), because of its easy scale, use With the advantages of long life, safety and environmental friendliness, it has become one of the best energy storage technologies. [0003] In vanadium batteries, the working substances in the positive and negative electrodes are electrolytes containing vanadium ions (negative electrode +2, +3 valence vanadium ions; positive electrode +4, +5 valence vanadium ions). The energy storage and reaction sites of the vanadium battery are separated, and the positive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/59
Inventor 刘乐武增华席靖宇邱新平
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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