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Method for preparing iron-chromium redox battery electrolyte

An electrolyte and battery technology, applied in the field of energy storage, can solve the problem of high cost and achieve the effect of digesting industrial waste and ensuring purity

Active Publication Date: 2021-01-15
中海储能科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies are all directly prepared with iron salts and chromium salts. Although there are advantages such as convenient operation and guaranteed product purity, the cost is still high

Method used

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  • Method for preparing iron-chromium redox battery electrolyte

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Embodiment 1

[0041] see figure 1 , the present embodiment proposes a system for preparing an electrolyte for an iron-chromium redox battery, comprising an electrolytic cell 5, a filter 3, and a reactor 1,

[0042] The electrolytic cell 5 includes a positive electrode chamber and a negative electrode chamber. The positive electrode chamber and the negative electrode chamber are separated by an ion-selective membrane. Both the positive electrode 503 and the negative electrode 502 are iron sheet electrodes, and the distance between the iron sheet electrodes and the bottom is 1 / 3 of the electrolytic cell. high;

[0043] The negative electrode chamber is connected to a filter 3 through a pipeline, and the filter 3 is connected to a buffer tank 4 through a pipeline, and the buffer tank 4 is connected to the reaction kettle 1 . Reactor 1 is connected with electrolyte storage tank 2 .

[0044] There is a slag outlet 501 at the bottom of the negative electrode chamber; the bottom of the negative ...

Embodiment 2

[0055] A method for preparing an electrolyte for an iron-chromium redox battery, using the system of Embodiment 1, including operations:

[0056] 1) The iron-containing material is dissolved in hydrochloric acid, the concentration of the hydrochloric acid is 0.2mol / L, an electrode is inserted in the solution, the electrode is set as the negative pole, and the current is electrolyzed; the iron-containing material is four Ferric oxide and red mud, the mass ratio of ferric oxide and red mud is 5:3, the mass ratio of red mud and ferric oxide total mass to 0.2mol / L hydrochloric acid is about 1:1,

[0057] The positive electrode solution for electrolysis is 0.2mol / L hydrochloric acid and 0.1mol / L sodium chloride;

[0058] The electrodes are iron electrodes. Using constant current electrolysis, set the current density to 0.2A / cm 2 , calculate the energization time according to the formula (1), so that the energization stops when the cell voltage is about -0.4V.

[0059] After the...

Embodiment 3

[0065] This embodiment proposes a method for preparing an electrolyte for an iron-chromium redox battery, using the system of Embodiment 1, including operations:

[0066] 1) The iron-containing material is dissolved in hydrochloric acid, the concentration of the hydrochloric acid is 0.2mol / L, an electrode is inserted in the solution, the electrode is set as the negative pole, and the current is electrolyzed; the iron-containing material is four Ferric oxide, the mass ratio of ferric oxide quality and 0.2mol / L hydrochloric acid is about 30:100,

[0067] The positive electrode solution for electrolysis is 0.2mol / L hydrochloric acid and 0.1mol / L sodium chloride;

[0068] The electrodes are iron electrodes. Using constant current electrolysis, set the current density to 0.2A / cm 2 , calculate the energization time according to the formula (1), so that the energization stops when the cell voltage is about -0.4V.

[0069] 2) Chromium chloride and hydrochloric acid are added in th...

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Abstract

The invention provides a method for preparing an iron-chromium redox battery electrolyte, and the method comprises the following steps: 1) dissolving an iron-containing material into hydrochloric acidwith the concentration of 0.1-0.5 mol / L, inserting an electrode into the solution, setting the electrode as a negative electrode, and introducing current for electrolysis; 2) adding chromium chlorideand hydrochloric acid into the reaction container under the condition of isolating air, and starting stirring in the process of adding chromium chloride; and 3) after the chromium chloride is completely dissolved, mixing the negative electrode solution obtained by electrolysis in the step 1) with the solution obtained in the step 2). According to the preparation method of the iron-chromium redoxbattery electrolyte, provided by the invention, industrial wastes, such as red mud and the like, can be used as electrolysis raw materials, and impurities which cannot be dissolved in the electrolytein the red mud are discarded through constant-current electrolysis, so that the industrial wastes are digested, and the cheap electrolyte is obtained.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a preparation method and a preparation system for an electrolyte solution of a liquid flow battery. Background technique [0002] When the concept of liquid flow energy storage battery was first proposed, it used Cr 3+ / Cr 2+ Cr in electrical pairing 2+ Reduction and Fe 3+ / Fe 2 + Electric pair Fe 3+ Oxidation of the acidic Cr separated by a proton exchange membrane 3+ Electrolyte and acidic Fe 2+ The electrochemical redox reaction takes place in the electrolyte. With the advancement of flow battery technology, researchers realized that the positive electrode Fe 3+ / Fe 2+ Cr for electric pair and negative electrode 3+ / Cr 2+ It is difficult to completely separate the electric pair, the diaphragm cannot completely isolate the penetration of iron ions, and the iron will diffuse to the negative electrode. If ferric iron exists, the deposited catalyst w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0005Y02E60/50
Inventor 不公告发明人
Owner 中海储能科技(北京)有限公司
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