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High-reliability vanadium ion electrolyte

A technology with high stability and electrolyte, which is applied in the direction of regenerative fuel cells, etc., can solve the problems of battery efficiency reduction, ethanol oxidation, and failure to meet the requirements, so as to improve charge and discharge performance and cycle stability, improve stability, and inhibit precipitation Effect

Inactive Publication Date: 2011-06-29
上海林洋储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The analysis shows that although ethanol can reduce the viscosity of the solution, improve the stability and conductivity of the solution, but in the process of charge and discharge, ethanol is easily oxidized by high-valence vanadium, which reduces the efficiency of the battery, so this method needs to be further improved
[0008] In summary, unstable phenomena such as precipitation of V(Ⅴ) and oxidation of V(II) in the vanadium ion electrolyte seriously affect the performance of the vanadium battery and restrict its development and application. The stability methods all have some limitations and cannot meet the requirements

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Potassium dihydrogen phosphate: analytically pure;

[0026] Sodium sulfate: analytically pure.

[0027] Take the total vanadium concentration as 1.4 molL -1 , the concentration of sulfuric acid is 2.8molL -1 V(IV):V(III)=1:1 blank (without additives) vanadium ion electrolyte 80mL, add 0.1g potassium dihydrogen phosphate and 2g sodium sulfate, divide the obtained electrolyte into two parts, respectively Place it in the positive and negative liquid storage tanks of the simulated vanadium battery for charge and discharge experiments. The experimental results are shown in Table 1.

Embodiment 2

[0029] Phosphoric acid: analytically pure;

[0030] Polyethylene glycol: analytically pure.

[0031] Take the total vanadium concentration as 1.4 molL -1 , the concentration of sulfuric acid is 2.8molL -1 V(IV):V(III)=1:1 blank (without additives) vanadium ion electrolyte 40mL, add 0.1mL 1molL -1 h 3 PO 4 solution, placed in the positive storage tank of the simulated vanadium battery, and the total vanadium concentration was 1.4 molL -1 , the concentration of sulfuric acid is 2.8molL -1 V(IV):V(III)=1:1 blank (without additives) vanadium ion electrolyte 40mL, add 0.1g polyethylene glycol, place in the negative electrode storage tank of the simulated vanadium battery, and charge and discharge experiment. The experimental results are shown in Table 1.

Embodiment 3

[0033] Sodium sulfate: analytically pure;

[0034] CTAB: analytically pure;

[0035] Glycerol: analytically pure;

[0036] Sodium hexametaphosphate: analytically pure.

[0037] Take the total vanadium concentration as 1.4 molL -1 , the concentration of sulfuric acid is 2.8molL -1 V(IV):V(III)=1:1 blank (without additives) vanadium ion electrolyte 40mL, add 3g sodium sulfate, 0.01g CTAB, place in the positive electrode storage tank of the simulated vanadium battery, take the total Vanadium concentration is 1.4molL -1 , the concentration of sulfuric acid is 2.8molL -1 V(IV):V(III)=1:1 blank (without additives) vanadium ion electrolyte 40mL, add 0.1g sodium hexametaphosphate, 1g glycerol, place in the negative storage tank of the simulated vanadium battery In, charge and discharge experiments were carried out. The experimental results are shown in Table 1.

[0038] figure 1 , figure 2 and image 3 The relationship curves of discharge capacity, coulombic efficiency, en...

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Abstract

The invention provides a high-reliability vanadium ion electrolyte, which is composed of vanadium sulphate, sulfuric acid, water and an additive, wherein the additive comprises at leas one material selected from the group consisting of an alkali metal salt, a hydroxyl-containing material and a surfactant. The high-reliability vanadium ion electrolyte provided by the invention, the deposition of V (V) and the oxidization of V (II) are effectively controlled by adding a novel additive composition into vanadium ion electrolyte and using the synergistic effects among the components of the additive, the stability of the electrolyte is greatly improved, and the charge and discharge properties and circulation stability of a vanadium battery effectively are improved by applying the vanadium ion electrolyte obtained to the vanadium battery.

Description

technical field [0001] The invention relates to the field of manufacturing liquid flow batteries, in particular to a vanadium ion electrolyte of a liquid flow battery. Background technique [0002] All-vanadium ion flow battery (referred to as vanadium battery) is a flow battery that uses vanadium ion solution as the active material and electrolyte. Vanadium battery has the advantages of deep high-current charge and discharge, high energy conversion rate and long cycle life. It can be used to prepare megawatt-level battery packs and be used in the field of high-power long-term storage and power supply, so it has been widely valued. The vanadium ion electrolyte is the core of the whole battery, and its properties, such as viscosity, conductivity and stability, have a great influence on the performance of the vanadium battery. [0003] Generally, the vanadium ion electrolyte can be divided into a positive electrode electrolyte and a negative electrode electrolyte, wherein the...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50
Inventor 李晓宁汪保国郭静张宗祥周汉涛李佳
Owner 上海林洋储能科技有限公司
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