Full-vanadium oxidation reduction flow battery

A liquid flow battery, vanadium oxidation technology, applied in the direction of regenerative fuel cells, etc., can solve the problems affecting the electronic exchange rate of active materials, affecting the performance of the vanadium battery system, affecting the working current density and energy efficiency of the vanadium battery, so as to prolong the life, Effects of improving energy efficiency and improving electrocatalytic activity

Inactive Publication Date: 2017-01-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, its performance directly affects the electron exchange rate of the active material, which greatly affects the working curr

Method used

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  • Full-vanadium oxidation reduction flow battery
  • Full-vanadium oxidation reduction flow battery

Examples

Experimental program
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Example Embodiment

[0030] Example 1

[0031] Add stannous pyrophosphate to 250mL vanadium electrolyte with a vanadium ion concentration of 1.6mol / L, a sulfuric acid concentration of 3.0mol / L, and a V(III) / V(IV) ratio of 1:1 to make the Sn 2+ The concentration is 0.2mol / L, and the electrolyte to be tested is prepared after stirring and dissolving.

[0032] Assemble the above-mentioned electrolyte without additives, Nafion-117 diaphragm, and unmodified graphite felt electrode into a single cell, wherein the area of ​​the graphite felt for the positive and negative electrodes is 5*6cm 2 .

Example Embodiment

[0033] Example 2

[0034] Add tin phosphate to 250mL vanadium electrolyte with a vanadium ion concentration of 1.6mol / L, a sulfuric acid concentration of 3.0mol / L, and a V(III) / V(IV) ratio of 1:1 to make the Sn in the solution 4+ The concentration is 0.1mol / L, and the electrolyte to be tested is prepared after stirring and dissolving.

[0035] Assemble the above-mentioned electrolyte without additives, Nafion-117 diaphragm, and unmodified graphite felt electrode into a single cell, wherein the area of ​​the graphite felt for the positive and negative electrodes is 5*6cm 2 .

Example Embodiment

[0036] Example 3

[0037] Add stannous pyrophosphate and stannous phosphate to 250mL vanadium electrolyte with a vanadium ion concentration of 1.6mol / L, a sulfuric acid concentration of 3.0mol / L, and a V(III) / V(IV) ratio of 1:1 to make the solution Medium Sn 2+ The concentration is 0.1mol / L, and the electrolyte to be tested is prepared after stirring and dissolving.

[0038] Assemble the above-mentioned electrolyte without additives, Nafion-117 diaphragm, and unmodified graphite felt electrode into a single cell, wherein the area of ​​the graphite felt for the positive and negative electrodes is 5*6cm 2 .

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Abstract

The invention provides a full-vanadium oxidation reduction flow battery which comprises a positive electrode, a negative electrode, a membrane, a positive electrode electrolyte and a negative electrode electrolyte, wherein the negative electrode comprises a carbon material substrate and a Sn-containing electro-catalyst combining with the carbon material surface; the negative electrode electrolyte comprises 1.0mol/L-1.8mol/L of vanadium ion, 2.0mol/L-5.0mol/L of sulfuric acid, and 0.01mol/L-0.3mol/L of Sn phosphate. According to the invention, the Sn-containing electro-catalyst is combined with the carbon material surface, so that the carbon material surface has higher catalytic activity; the electro-catalytic activity of the electrode material for V(III)/V(II) electron pair reaction is increased; the electrochemical polarization is reduced; the voltage efficiency and the energy efficiency of the battery are increased; according to the invention, Sn ion is introduced into the electrolyte, so that the electrochemical activity of the vanadium battery electrolyte is increased; the capacity fading of the vanadium battery is reduced; the use ratio of the electrolyte is increased when the battery is charged/discharged under a high-current density condition; the energy efficiency of the vanadium battery is increased.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and in particular relates to an all-vanadium redox flow battery. Background technique [0002] Usually, the rapid development of social economy requires more and more energy. At the same time, the problem of environmental degradation caused by the rapid depletion of fossil energy and the burning of fossil energy has become increasingly prominent. In order to reduce the utilization of fossil energy, people pay more and more attention to the development and utilization of renewable energy (such as wind energy, solar energy, etc.). However, renewable energy is affected by geographical and meteorological conditions, and is unstable and discontinuous. In order to make better use of new energy, large-scale energy storage technology must be developed. All-vanadium redox flow battery (referred to as "vanadium battery") has the advantages of large power and capacity, long cycle life, high energy eff...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/18Y02E60/50
Inventor 陈勇
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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