Gradient electrode for flow batteries and application thereof

A flow battery and electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited improvement in voltage efficiency and energy efficiency, achieve volume and cost reduction, easy batch preparation, and reduce electrochemical electrodes. the effect of

Active Publication Date: 2017-04-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only reduces the contact resistance between the electrode bipolar plates, and has no effect on the bulk resistance of the electrodes and electrolyte, which account for a large proportion of the internal resistance of the battery, so the improvement of voltage efficiency and energy efficiency is limited.

Method used

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  • Gradient electrode for flow batteries and application thereof
  • Gradient electrode for flow batteries and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Choose a thickness of 2.5mm and a bulk density of 0.08gcm -3 The graphite fiber felt is used as the diffusion layer, with a thickness of 2mm and a bulk density of 0.16gcm -3 The carbon fiber felt is used as the catalytic layer, and then the two layers of felt are stacked together, and they are needled into one body with a needle punching machine to make gradient electrodes with different densities in the longitudinal direction, and the needle punching density is 100 needles / cm 2 . When the cell is assembled, the gradient electrode has a diffusion layer close to the bipolar plate and a catalytic layer close to the membrane. Under the compression of the end plate, it is assembled into an all-vanadium flow cell. After compression, the thickness of the electrode is about 3mm, and the electrode area is 48cm 2 . The positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4 Solution 60ml, negative electrode electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 60ml. The charge and disc...

Embodiment 2

[0030] Choose a thickness of 4mm and a density of 0.1gcm -3 The carbon fiber felt is used as the diffusion layer, with a thickness of 1mm and a bulk density of 0.2gcm -3 The carbon fiber felt is used as the catalytic layer, and then the two layers of felt are stacked together, and they are needled into one body with a needle punching machine to make gradient electrodes with different densities in the longitudinal direction, and the needle punching density is 200 needles / cm 2 . When the cell is assembled, the gradient electrode has a diffusion layer close to the bipolar plate and a catalytic layer close to the membrane. Under the compression of the end plate, it is assembled into an all-vanadium flow cell. After compression, the thickness of the electrode is about 4mm, and the electrode area is 48cm 2 . The positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4 Solution 60ml, negative electrode electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 60ml. The single cell adopting the g...

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Abstract

The invention relates to a gradient electrode for flow batteries. The gradient electrode is formed by: stacking at least two layers of graphite fiber or carbon fiber felt with different bulk densities in an order from low bulk density to high bulk density, and making the materials into a whole by longitudinal needling perpendicular to an electrode surface. The electrode can effectively reduce the resistance of the electrode body, and lower the flow resistance of an electrolyte solution and provide more reaction sites, thus finally reducing ohmic polarization, electrochemical polarization and concentration polarization of flow batteries. The gradient electrode provided by the invention improves the energy efficiency and voltage efficiency of flow batteries so as to improve the working current density, thus greatly reducing the weight, volume and cost of batteries with similar output power.

Description

technical field [0001] The invention relates to the field of flow batteries in chemical energy storage technology, in particular to electrodes of all-vanadium flow batteries. Background technique [0002] Due to its independent output power and capacity, the all-vanadium redox flow battery has flexible system design; high energy efficiency, long life, high operation stability and reliability, and low self-discharge; large degree of freedom in site selection, no pollution, and simple maintenance. With the advantages of low operating cost and high safety, it has broad development prospects in large-scale energy storage. It is considered to be an effective method to solve the random and intermittent unsteady characteristics of renewable energy power generation systems such as solar energy and wind energy. There are significant demands in power generation and smart grid construction. [0003] Different from the function of ordinary chemical power electrodes, the electrodes of t...

Claims

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Application Information

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IPC IPC(8): H01M4/86
CPCH01M4/8642Y02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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