Manufacturing process of electrolyte for oxidation reduction cell

Abstract

The invention provides a manufacturing process of electrolyte for an oxidation reduction cell. The process comprises the following steps of: adding vanadic oxide into an alkaline water solution, wherein the added vanadic oxide accounts for 20-50 weight percent of alkaline water solution; adding sulfuric acid so as to react to form vanadyl sulfate until pH reaches 2.0-2.2; removing sodium sulfate with an electrodialysis apparatus and beginning a diaphragm electrolysis working procedure 1 to reduce into the mixed solution of vanadic sulfate and vanadyl sulfate; adding sulfuric acid so as to enter a diaphragm electrolysis 2 so that vanadyl sulfate is obtained at the anode and enter a diaphragm electrolysis working procedure 3 so that anode electrolyte is obtained at the anode; introducing vanadic sulfate acquired at the cathode to the cathode side of the diaphragm electrolysis working procedure 4, introducing the solution acquired at the cathode of the diaphragm electrolysis working procedure 3 into the anode side of the diaphragm electrolysis working procedure 4 so as to acquire cathode electrolyte by electrolysis. The method provided by the invention can be used for manufacturing the electrolyte for the oxidation reduction cell under normal temperature and pressure without generating poisonous waste gas and waste water and degradation operation, and the obtained product can be directly used as electrolyte.

Description

technical field [0001] The invention relates to a method for manufacturing an electrolyte for a redox battery, in particular to a method for preparing an electrolyte for a redox battery by using vanadium pentoxide as a raw material. Background technique [0002] A redox battery is a secondary battery that stores power in an electrolyte, and charges and discharges through the redox reaction of the electrolyte. The electrolyte used in the general redox battery uses a vanadium (IV) sulfate solution as the positive electrode electrolyte, and a vanadium (III) sulfate solution as the negative electrode electrolyte. Among them, the production process of the vanadyl sulfate used in the positive electrode electrolyte is extremely complicated, and high temperature (200-300° C.) and high pressure (5-20 atmospheres) are also required. [0003] In addition, the production process of negative electrode electrolyte vanadium (III) oxide also includes the dissolution in concentrated sulfuri...

AI Technical Summary

Problems solved by technology

Among them, the production process of vanadyl sulfate used in the positive electrode electrolyte is extremely complicated, and high temperature (200-300°C) and high pressure (5-20 atmospheres) are also required.

[0003] In addition, the production process of negative electrode electrolyte vanadium (III) oxide also includes dissolving in concentrated sulfuric acid, so the operation is extremely dangerous, all of which require highly skilled technology and special job qualifications, special machinery and equipment, and safety equipment, environmental requirements, etc., often cannot be manufactured due to many legal restrictions

[0004] In fact, there have been low-cost redox batteries that can stably store a large amount of power since decades ago, but the popularization of redox batteries has been delayed due to the inability to manufacture electrolytes safely and efficiently.

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