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Full vanadium ion fluid cell electrolyte and preparing process thereof

A technology for flow batteries and electrolytes, applied in secondary batteries, regenerative fuel cells, secondary battery parts, etc., can solve the problem of undisclosed charge and discharge performance of electrolytes, affecting stability and conductivity, and difficult to adapt to low-temperature environments. and other problems to achieve the effect of reducing viscosity, improving electrical conductivity, improving stability and electrical conductivity

Inactive Publication Date: 2006-01-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of the existing vanadium electrolyte is vanadium sulfate [positive electrode (VO 2 ) 2 SO 4 and VOSO 4 , negative pole V 2 (SO 4 ) 3 and VSO 4 ] and sulfuric acid and water, there are defects of high viscosity, affecting its stability and conductivity, especially difficult to adapt to low temperature environment
Chinese patent (publication number CN 1507103) "high-energy static vanadium battery" adds stabilizers such as alcohols, organic acids, salts or polymer compounds in the vanadium electrolyte, "can make the concentration of pentavalent and divalent vanadium ions exceed the limit concentration It will not precipitate or separate out, and can form a colloid or maintain a solution state." The purpose of the added stabilizer is only to prevent precipitation or precipitation when the concentration of vanadium ions is high, and the application does not disclose the charge and discharge performance of the electrolyte
The article "Improving the Stability of Vanadium Battery Electrolyte" (Power Technology vol.26 No.1Feb.2002) by Xu Qian et al. introduced that the addition of 2% sodium sulfate improves the stability and stability of vanadium electrolyte (sulfuric acid, water system). Conductivity, there is no report on the stability and conductivity of sulfuric acid, water, and ethanol systems, and the performance of low-temperature performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 2000 grams of qualified vanadium liquid (0.349mol / L), add concentrated sulfuric acid until the pH value is 1.0, and feed SO 2 Reaction, add sodium carbonate to pH value 4.5, filter, precipitate is dissolved in sulfuric acid, water (60mL of sulfuric acid, water 200mL), obtain the vanadyl sulfate sulfuric acid aqueous solution of 300mL blue, test: sulfuric acid concentration 2mol / L, the concentration of vanadium is 2mol / L. Above-mentioned vanadium solution is placed in electrolytic cell cathode; Preparation 2mol / L sulfuric acid, 1.2mol / L Na 2 SO 4 Solution, placed on the anode of the electrolytic cell; electrolyzed in a constant current mode, with a current density of 50mA / cm 2 ; Electrolyze until the potential value of the vanadium electrolyte is 200mV, carry out potentiometric titration analysis on the electrolyte, the ratio of the concentration of 4-valence vanadium and the concentration of 3-valence vanadium is 1:1. Take 35mL of the electrolyte prepared by el...

Embodiment 2

[0023] Weigh 2000 grams of qualified vanadium liquid (0.349mol / L), add concentrated sulfuric acid until the pH value is 1.0, and feed SO 2 Reaction, adding sodium carbonate to a pH value of 4.2, filtering, returning the filtrate to qualified vanadium liquid for reuse, and dissolving the precipitate in a solution of sulfuric acid, water and ethanol (sulfuric acid 60mL, water 80mL and ethanol 120mL), adding Na 2 SO 4 6 grams, 4 grams of sodium pyrophosphate, obtain the blue vanadyl sulfate ethanol solution of 300mL, test: sulfuric acid concentration 2mol / L, the concentration of vanadium is 2mol / L. Above-mentioned vanadium solution is placed in electrolytic cell cathode; Preparation 2mol / L sulfuric acid, 1.2mol / L Na 2 SO 4 Solution, placed on the anode of the electrolytic cell; electrolyzed in a constant current mode, with a current density of 50mA / cm 2 ; Electrolyze until the potential value of the vanadium electrolyte is 200mV, carry out potentiometric titration analysis on...

Embodiment 3

[0031] Qualified vanadium liquid (Pangang Panhong Company) has a total vanadium concentration of 0.349mol / L

[0032] h 2 SO 4 : Analytical pure, d=1.84

[0033] Liquid SO 2 : Analytical pure

[0034] Sodium carbonate: analytically pure

[0035] Ethanol: analytically pure

[0036] Na 2 SO 4 : Analytical pure

[0037] Sodium pyrophosphate: analytically pure

[0038] Sodium fluorosilicate: analytically pure

[0039] Hydrogen peroxide: analytically pure, 30%

[0040] Vanadium battery model making: Polyurethane boards are used to make frame plates, Nafion proton exchange membranes after activation treatment are used as conductive diaphragms, cathode pools are 100×100×5mm, anode pools are 100×100×5mm, and self-made graphite electrodes are 100×100×1.5mm.

[0041] Weigh 2000 grams of qualified vanadium liquid, add concentrated sulfuric acid until the pH value is 1.0, and feed SO 2 reaction, adding sodium carbonate to a pH value of 4.2, filtering, and returning the filtrate...

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PUM

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Abstract

This invention relates to an electrolyte of a full-vanadium ionic fluid-flow battery composed of V salt sulfate, H2So4, water, alcohol and additives, which are Na2SO4, Na pyrophosphate, salufer and hydrogen peroxide. This invention also provides a preparation method: pumping qualified V liquid from a V-plant into a reaction tank, regulating the PH value of the solution and inletting liquid SO2 into it to be recovered, then the PH value of the solution is regulated with Na2SO4 to deposit VO2 to be dissolved in the solution containing H2SO4, water and alcohol to be added with the additives to be electrolyzed in the tank to get the V electrolyte with 50% of 3valence and 4 valence V separately and density of 1.0mol / L~4.2mol / L .

Description

technical field [0001] The invention relates to an energy storage type liquid flow battery—all-vanadium ion flow battery, in particular to an electrolyte solution of an all-vanadium ion flow battery. Background technique [0002] Vanadium battery is one of the green storage batteries with strong development momentum at present, and its manufacture, use and disposal process do not produce harmful substances. It has a special battery structure, and its active material is separated from the electric stack, which is similar to a fuel cell. The manufacturing cost is lower than that of a fuel cell, and its production process is relatively simpler than that of a lead-acid battery and a fuel cell. All-vanadium ion flow battery has high relative electrode potential of ions in different valence states, can be deeply discharged at high current density, charged quickly, and has high energy conversion rate. It can prepare megawatt-level battery packs and provide electric energy with high...

Claims

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Application Information

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IPC IPC(8): H01M10/02H01M10/36H01B1/00C01G31/00H01M8/18
CPCY02E60/10Y02E60/50
Inventor 李林德张波潘进黄可龙刘素琴李晓刚陈立泉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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