All-vanadium redox flow battery electrolyte for inhibiting hydrogen evolution of electrolyte and preparation method of all-vanadium redox flow battery electrolyte

Abstract

The invention belongs to the field of electrolytes, and particularly relates to an all-vanadium redox flow battery electrolyte capable of inhibiting hydrogen evolution of the electrolyte. The electrolyte in a sulfuric acid system, a hydrochloric acid system or a mixed system of the sulfuric acid system and the hydrochloric acid system comprises the following elements: an IA main group, an IIA maingroup, a VA main group, an IVB subgroup, a VIIB subgroup, an IB subgroup, a VIB subgroup and a VIIIB subgroup, wherein the elements of the same group are set to have the same range value, and the electrolyte simultaneously contains the following different groups of elements: an IA group, an IIA group, a VA group, a VIIIB subgroup, an IB subgroup, an IIA main group, an IVB group, a VIIIB group anda VA main group, wherein the IA group, the IIA group and the VA group are set to have different range values, the VIIIB subgroup, the IB subgroup and the IIA main group are set to have different range values, and the IVB group, the VIIIB group and the VA main group are set to have different range values. By controlling the content of the elements, the attenuation speed of the discharge capacity of the system is reduced, and the hydrogen evolution speed is reduced at the same time, so that the possibility of reaching the explosion limit after H2 escapes to the outer space of the battery is greatly reduced, and the operation safety is further improved.

Description

technical field [0001] The invention belongs to the field of electrolytes, and in particular relates to an all-vanadium redox flow battery electrolyte that can suppress hydrogen evolution from the electrolyte. Background technique [0002] At present, the commonly used battery electrolyte is the all-vanadium redox flow battery electrolyte, which requires the content of vanadium in the raw material to be >97%, the total impurity content of the high-purity electrolyte to be <100mg / L, and the requirement for a single element to be <5mg / L, which results in the cost of the electrolyte. stay high. [0003] In order to reduce the cost of the electrolyte, on the basis of not affecting the performance of the solution, some elements are allowed to exist in a certain concentration, including hydrogen-evolving elements. Due to the strong electrochemical catalytic effect of these elements, when they exist in vanadium electrolysis In the liquid, it will catalyze the rapid hydrog...

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Problems solved by technology

In the prior art, there are few studies on such elements in the field of electrolytes, only involving the concentration points of individual hydrogen-evolving elements, and no in-depth and systematic research on the entire hydrogen-evolving elements

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