Preparing method of electrolyte solution for redox battery, electrolyte solution for redox battery prepared by the method and sealed type redox battery comprising the same

The electrolyte manufacturing method for redox batteries addresses gas generation issues by incorporating an organic solvent and metal extractant to minimize impurities, ensuring stable internal pressure and extended battery life.

KR102999424B1Active Publication Date: 2026-08-03STANDARD ENERGY CO LTD
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Patent Information

Application Number
KR1020240026643
Authority / Receiving Office
KR · KR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-02-23
Publication Date
2026-08-03
Estimated Expiration
2044-02-23

AI Technical Summary

Technical Problem

Gas generation due to side reactions in redox batteries, particularly in sealed vanadium ion batteries, increases internal pressure and reduces lifespan, posing significant structural issues.

Method used

A method for manufacturing an electrolyte for redox batteries involves adding an organic phase solvent and a metal extractant to an aqueous solution containing an active material, followed by phase separation to remove metal impurities, ensuring minimal gas generation by maintaining an internal pressure increase of 1 kPa or less during 100 charge-discharge cycles.

Benefits of technology

Significantly reduces gas generation and internal pressure fluctuations, enhancing the longevity and safety of sealed redox batteries by effectively removing impurities that cause side reactions.

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Abstract

The present invention relates to a method for preparing an electrolyte that functions as a liquid electrode in a redox battery, comprising the steps of: adding an organic phase solvent and a metal extractant to an aqueous solution containing an active material whose acid value changes according to redox; and separating the organic phase containing metal impurities from the aqueous solution to remove the metal impurities, wherein when the internal pressure is measured while performing a charge-discharge test under the battery structure and charge-discharge conditions as described below using the electrolyte, the increase in the final pressure measured after the 100th discharge relative to the reference pressure measured after the 11th discharge is 1 kPa or less. - Battery structure: A sealed structure with 138g of electrolyte and a solid electrode area of ​​99×99mm. - Charging conditions: Charge at constant current at 25 ℃ and 1.6 A (1 C) until 1.53 V or 2 Wh is reached. - Discharge conditions: Discharge at constant current at 25 ℃ and 1.6 A (1 C) until 1.1 V is reached. The present invention has the effect of significantly reducing the gas generated during the charging and discharging process of a redox battery by removing impurities that cause gas generation.
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