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Positive electrode electrolyte of high-concentration all-vanadium redox flow battery

A technology of all-vanadium redox flow battery and positive electrode electrolyte, which is applied in battery electrodes, electrolytes, fuel cells, etc., can solve the problems of unstable positive electrode electrolyte and limited effect, and achieve high-efficiency, long-term stable operation, low cost, and stability sex enhancing effect

Inactive Publication Date: 2020-05-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of existing additives is limited, and the positive electrode electrolyte is still unstable at high temperatures

Method used

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  • Positive electrode electrolyte of high-concentration all-vanadium redox flow battery
  • Positive electrode electrolyte of high-concentration all-vanadium redox flow battery
  • Positive electrode electrolyte of high-concentration all-vanadium redox flow battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The high-concentration all-vanadium redox flow battery cathode electrolyte of this embodiment includes vanadium ions, sulfuric acid, water and additives, wherein the additives are selected from boric acid, tributyl phosphate, phytic acid, potassium hexafluorophosphate, sodium monofluorophosphate, all One or more of fluorobutanesulfonic acid and pyridinium propanesulfonate (the kind of additive is shown in Table 1 below).

[0023] Prepare V(V) electrolyte (2.0M VO 2 + / 4.6M H 2 SO 4 ), add 2% (relative to the molar amount of vanadium ions in the electrolyte) of additives to 40mLV (V) electrolyte, ultrasonically mix, and place at 50°C with the blank V (V) electrolyte sample without any addition In the constant temperature water bath, the effect of 2% additives on the thermal stability of the V(V) electrolyte was investigated, and the results are shown in Table 1 below.

[0024] Table 1: Effect of different additives on the stability of V(V) electrolyte

[0025]

Embodiment 2

[0027] The high-concentration all-vanadium redox flow battery cathode electrolyte of this embodiment includes vanadium ions, sulfuric acid, water and additives, wherein the additive is ammonium hexafluorophosphate.

[0028] Prepare V(V) electrolyte (2.0M VO 2 + / 4.6M H 2 SO 4 ), add 3% (relative to the molar amount of vanadium ions in the electrolyte) additive to 40mLV (V) electrolyte, ultrasonically mix, and place it at 40 / In a constant temperature water bath at 50 / 60°C, the influence of 3% additives on the thermal stability of the V(V) electrolyte was investigated, and the results are shown in Table 2 below.

[0029] Table 2: Effect of Additives on V(V) Electrolyte Stability at Different Temperatures

[0030]

[0031]

Embodiment 3

[0033] The high-concentration all-vanadium redox flow battery cathode electrolyte of this embodiment includes vanadium ions, sulfuric acid, water and additives, wherein the additive is pyridinium propanesulfonate (PPS).

[0034] By dissolving VOSO 4 The method for preparing V(IV) electrolyte (2.0M V(IV)+4.6M H 2 SO 4 ), respectively add 0%, 1% (relative to the molar weight of vanadium ions in the electrolyte) of the PPS additive in the 30mLV (IV) electrolyte, ultrasonically mix, and use for cyclic voltammetry test (CV). CV adopts CHI660c electrochemical workstation for cyclic voltammetry performance test. During the test, a three-electrode system is used. The working electrode is a polished and cleaned graphite rod, the counter electrode is a platinum electrode, and the reference electrode is a saturated calomel electrode. 2mol / LV 4+ +4.6mol / L H 2 SO 4 , the scan rate is 20mV / s.

[0035] The above test results are as figure 1 shown by figure 1 It can be seen that the e...

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Abstract

The invention discloses a positive electrode electrolyte of a high-concentration all-vanadium redox flow battery. The electrolyte comprises vanadium ions, sulfuric acid and additives, and the additives comprise one or more of boric acid, borate, phytic acid, phytate, tributyl phosphate, perfluorobutyl sulfonic acid, perfluorobutyl sulfonate, hexafluorophosphoric acid, hexafluorophosphate, monofluorophosphoric acid, monofluorophosphate, difluorophosphoric acid, difluorophosphate and pyridinium propanesulfonate. The concentration of V(V) and / or V(IV) in the positive electrode electrolyte of theall-vanadium redox flow battery is within a relatively wide concentration range, the stability of the positive electrode electrolyte is obviously improved, and the all-vanadium redox flow battery canadopt an electrolyte with higher V(V) and / or V(IV) concentration and is suitable for a higher temperature range, so that the energy density and the performance of the all-vanadium redox flow battery are obviously improved.

Description

technical field [0001] The invention belongs to the field of energy storage devices, in particular to an electrolyte solution for an all-vanadium redox flow battery. Background technique [0002] In order to solve the two major worldwide problems of energy crisis and environmental pollution, people are committed to developing and utilizing renewable energy, including wind energy, solar energy, biomass energy, ocean energy, etc., and converting them into electrical energy for people to use. However, these renewable energy power generation is affected by geographical, meteorological and other conditions, and has obvious instability and intermittent characteristics. Therefore, it is particularly important to develop efficient energy storage technology to facilitate the smooth and stable output of renewable energy generation, improve power quality and grid reliability. All-vanadium redox flow battery has many outstanding advantages such as system capacity and power independent ...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2004/8689H01M2300/0091Y02E60/50
Inventor 刘素琴韦贤丽赵匡民杨玉良黄容姣
Owner CENT SOUTH UNIV
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