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Electrolyte used for vanadium cells and preparation method of electrolyte

An electrolyte and vanadium battery technology, applied in the electrolyte and preparation field of high-concentration redox all-vanadium redox flow batteries, can solve problems such as precipitation, and achieve high discharge voltage, electrochemical reversible improvement, stability and electrochemical performance. Activity enhancing effect

Inactive Publication Date: 2018-04-03
青岛九洲千和机械有限公司
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  • Abstract
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Problems solved by technology

[0004] The core of the vanadium redox flow battery is that the concentration of the electrolyte determines the energy density. A high-concentration electrolyte can achieve a high specific energy of the battery. However, in actual use, high-valence vanadium species will precipitate due to the increase in concentration and temperature. phenomenon, so that the concentration of the vanadium battery electrolyte can only be maintained at about 1.8mol / L, and its energy density can only reach 25Wh / kg

Method used

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Embodiment Construction

[0019] A method for preparing an electrolyte for a vanadium battery, comprising the preparation of positive and negative electrolytes, comprising the following steps:

[0020] 1), prepare the mother liquor of vanadium battery anode electrolyte: put the mixture of vanadium pentoxide and sulfuric acid into the cathode chamber of two-chamber electrolyzer, add sulfuric acid to electrolyze in the anode chamber of electrolyzer, make tetravalent vanadium ion electrolyte, namely It is the mother liquor of the vanadium battery anode electrolyte;

[0021] 2), preparation of vanadium battery negative electrode electrolyte mother solution: continue to electrolyze the electrolytic system in step 1) to obtain the mother solution of trivalent vanadium ion electrolyte; or place the obtained tetravalent vanadium ion electrolyte on the positive and negative electrodes of the vanadium battery respectively The two chambers are charged, and after being fully charged, the negative electrode chamber...

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Abstract

The invention provides an electrolyte used for vanadium cells and a preparation method of the electrolyte. The electrolyte is made by adding methanesulfonic acid into an electrolyte containing quadrivalent and trivalent vanadium ions and obtained through electrolysis. The provided electrolyte is obviously improved in the electrode reaction activity and charge-discharge energy efficiency of vanadium cells.

Description

technical field [0001] The invention relates to the field of liquid flow batteries, and more specifically relates to an electrolyte solution of a highly stable and high-concentration redox all-vanadium redox flow battery and a preparation method thereof. Background technique [0002] The all-vanadium redox flow battery realizes the storage and release of electrical energy through the mutual conversion between vanadium ions in different valence states. It is the only battery system that uses the same element in chemical power sources. The cross-contamination caused by the interpenetration of different types of active materials between batteries, and vanadium ions in different valence states are used as the positive and negative active materials of the battery, and the positive and negative electrolytes are stored separately, which eliminates self-discharge during battery storage and is suitable for large-scale applications. secondary energy storage. [0003] More specificall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/186H01M8/188Y02E60/50
Inventor 李辉
Owner 青岛九洲千和机械有限公司
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