Method of preparing vanadium electrolyte solution and battery including vanadium electrolyte solution
OwnerJong Wook HA, Deok Hyeon HWANGinventors
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Abstract
The present invention relates to a method of preparing a vanadium electrolyte solution and a battery including the vanadium electrolyte solution. According to the present invention, the present invention has an effect of providing a method of preparing a vanadium electrolyte solution that allows control of the reduction reaction rate of a vanadium compound, provides an effect of omitting separation and recovery processes by not generating by-products, and provides reproducibility of a single manufacturing process and a battery including the vanadium electrolyte solution.
Claims23
A method of preparing a vanadium electrolyte solution, comprising:
- a first step of adding a pentavalent vanadium compound and water and then sequentially adding a nitrogen-based reducing agent and an acid to reduce the pentavalent vanadium compound to a tetravalent vanadium compound;
- and
- a second step of reducing the tetravalent vanadium compound to a 3.3- to 3.7-valent vanadium compound,
- wherein reaction rates of one or more reduction reactions selected from the reduction reaction of the first step and the reduction reaction of the second step are reduced.
A method of preparing a vanadium electrolyte solution, comprising:
- step (A) of preparing a reaction mixture by adding a pentavalent vanadium compound to a solvent and then adding a nitrogen-based reducing agent thereto;
- step (B) of reducing the pentavalent vanadium compound to a tetravalent vanadium compound while performing a dehydration reaction by adding an acid and a redox additive to the reaction mixture;
- step (C) in which the dehydration reactant oxidizes the nitrogen-based reducing agent to generate nitrogen gas and a self-reduced product;
- and
- step (D) in which the self-reduced product is oxidized by heating the reactant and the tetravalent vanadium compound is reduced to a 3.3- to 3.7-valent vanadium compound,
- wherein an entire amount of the nitrogen-based reducing agent is added in step (A), or the nitrogen-based reducing agent is added in steps (A) and (D) in a split manner.
A method of preparing a vanadium electrolyte solution, comprising:
- a first step of obtaining a reduced vanadium compound by reacting a vanadium compound, a reducing agent, and an acid at 100° C. or higher in 5 to 15 mol of a pre-solvent per 1 mol of the vanadium compound;
- a second step of cooling the reduced vanadium compound to −25 to 20° C. after the reaction is complete;
- and
- a third step of performing circulation filtration of the cooled vanadium electrolyte solution at −25 to 40° C.
Dependencies are inferred from the claim text.