A gradient electrode for a flow battery and its application

A flow battery and electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited improvement of voltage efficiency and energy efficiency, and achieve volume and cost reduction, good fluidity, and small longitudinal resistance. Effect

Active Publication Date: 2019-11-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A gradient electrode for a flow battery and its application
  • A gradient electrode for a flow battery and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Select 2.5mm thick, bulk density 0.08gcm -3 The graphite fiber felt is used as the diffusion layer, with a thickness of 2 mm and a bulk density of 0.16 gcm. -3 The carbon fiber felt is used as the catalytic layer, and then the two layers of felt are superimposed together, and they are needled into one body with a needle punching machine to obtain gradient electrodes with different densities in the longitudinal direction, and the needle punch density is 100 needles / cm. 2 . When the cell is assembled, the gradient electrode has the diffusion layer close to the bipolar plate and the catalytic layer close to the membrane. It is assembled into an all-vanadium flow single cell under the compression of the end plate. After compression, the electrode thickness 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 electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 60ml. The charge-discharge curves of the ...

Embodiment 2

[0030] Select 4mm thick, bulk density 0.1gcm -3 The carbon fiber felt is used as the diffusion layer, with a thickness of 1 mm and a bulk density of 0.2 gcm. -3 The carbon fiber felt is used as the catalytic layer, and then the two layers of felt are superimposed together, and they are needled into one body with a needle punching machine to obtain gradient electrodes with different densities in the longitudinal direction, and the needle punch density is 200 needles / cm. 2 . When the cell is assembled, the gradient electrode has the diffusion layer close to the bipolar plate and the catalytic layer close to the membrane. It is assembled into an all-vanadium flow single cell under the compression of the end plate. After compression, the electrode thickness 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 electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 60ml. The single cell using the gradient electr...

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Abstract

A gradient electrode for a liquid flow battery The gradient electrode is composed of at least two layers of graphite fibers or carbon fiber mats with different bulk densities stacked in order from low to high bulk densities, and is integrated by longitudinal needle punching perpendicular to the electrode surface. This kind of electrode can effectively reduce the resistance of the electrode body, reduce the flow resistance of the electrolyte and provide more reaction places, and finally reduce the ohmic polarization, electrochemical polarization and concentration polarization of the flow battery. The invention improves the energy efficiency and voltage efficiency of the liquid flow battery, thereby increasing its working current density, so that the weight, volume and cost of the battery with the same output power are greatly reduced.

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] All-vanadium redox flow batteries are flexible in system design due to their independent output power and capacity; high energy efficiency, long life, high operational stability and reliability, and low self-discharge; large degree of freedom in location selection, no pollution, and simple maintenance. It has the advantages of low operating cost and high safety, and has broad development prospects in terms of large-scale energy storage. There is a significant need in power generation and smart grid construction. [0003] Different from the functions of ordinary chemical power electrodes, the electrodes of flow batteries are the places where the chemical energy storage system is charged and discharged. The electrodes of this kind of batteries do not participate in the elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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