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Vanadium battery capacity attenuation reducing method

A capacity decay, vanadium battery technology, applied in the field of vanadium batteries, can solve the problems of the repeatability and stability of diaphragm production, reduce the voltage efficiency and energy efficiency of vanadium batteries, etc., to reduce vanadium ion penetration, reduce water The effect of migration and improving coulomb efficiency

Inactive Publication Date: 2015-09-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method, although feasible, reduces the voltage efficiency and energy efficiency of the vanadium battery
In addition, there are reports of using high-performance separators to block vanadium to slow down battery capacity fading, but the production repeatability and stability of these separators are still facing challenges

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] use as figure 1 The schematic diagram of the device is shown to assemble a vanadium battery, in which the battery separator A is a cation exchange membrane. The vanadium battery without additives has a current density of 30mAcm -2 After 30 cycles, the charging capacity is reduced by 74.4%, and the osmotic pressure of the negative electrode electrolyte of the vanadium battery is reduced. Reassemble the vanadium battery, add 2-methylimidazole with a mass fraction of 1.0% in the negative electrode electrolyte, and keep other operating conditions unchanged. After 30 charge-discharge cycles at the same current density, the charge capacity of the vanadium battery only decays by 19.8%. , see the relationship diagram of capacity decay before and after the addition of additives figure 2 . image 3 It is a comparison chart of vanadium battery coulombic efficiency after 60 charge-discharge cycles before and after adding additives. It can be seen that the performance of vanadiu...

Embodiment 2

[0021] use as figure 1 The schematic diagram of the device is shown to assemble a vanadium battery, in which the battery diaphragm A is an anion exchange membrane, and the vanadium battery without additives has a current density of 30mAcm -2 After 30 cycles, the charging capacity is reduced by 58.6%, and the osmotic pressure of the positive electrode electrolyte of the vanadium battery is reduced. The vanadium battery was reassembled, and 5.0% EDTA disodium salt was added to the positive electrolyte. Other operating conditions remained unchanged. After 30 charge-discharge cycles at the same current density, the charge capacity of the vanadium battery only decayed by 22.4%. The coulombic efficiency of the vanadium battery after 60 charge-discharge cycles before and after adding the additives was compared. The coulombic efficiency was 93% before the additives were added, and 94% after the additives were added. The addition of additives effectively reduces the capacity fading of...

Embodiment 3

[0023] use as figure 1 The schematic diagram of the device is shown to assemble a vanadium battery, in which the battery diaphragm A is an anion exchange membrane, and the vanadium battery without additives has a current density of 30mAcm -2 After 30 cycles, the charging capacity is reduced by 58.6%, and the osmotic pressure of the positive electrode electrolyte of the vanadium battery is reduced. Reassemble the vanadium battery, add magnesium chloride with a mass fraction of 2.5% in the positive electrolyte, and keep other operating conditions unchanged. After 30 charge-discharge cycles at the same current density, the charge capacity of the vanadium battery only decays by 23.6%. The coulombic efficiency of the vanadium battery after 60 charge-discharge cycles before and after adding the additives was compared. The coulombic efficiency was 93% before the additives were added, and 94% after the additives were added. The addition of additives effectively reduces the capacity f...

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Abstract

The present invention provides a vanadium battery capacity attenuation reducing method, in the process of vanadium battery charge and discharge circulation, a forward osmosis driving fluid additive is added into the electrolyte at the electrolyte osmotic pressure reducing side, the additive may not affect the electrolyte oxidation reduction activity, through the balancing of positive and negative electrode electrolyte osmotic pressure difference, vanadium ion penetration and water migration in a vanadium battery can be inhibited, the vanadium battery capacity attenuation in the circulation process can be effectively reduced, and the coulombic efficiency of the vanadium battery is improved. The method is simple and practical, and the vanadium battery service life is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of vanadium batteries, and in particular relates to a method for reducing capacity attenuation of vanadium batteries. Background technique [0002] All vanadium redox flow battery (referred to as vanadium battery) is a new type of large-scale electrochemical energy storage device, which has the advantages of independently designed capacity, high current deep charge and discharge, and fast response. , solar energy and other renewable energy generation and energy storage, power system peak shaving and valley filling, smart grid construction and other fields have broad application prospects. Since M.Skyllas-Kazacos of the University of New South Wales first proposed in 1985, in recent decades received extensive research and attention. [0003] In the vanadium battery, the electrolyte uses a fluid vanadium ion acidic solution as the medium, the V(Ⅴ) / V(Ⅳ) pair is used as the positive electrode active material, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 景文珩李帅强邢卫红徐南平
Owner NANJING UNIV OF TECH
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