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Combined electrode for flow battery and flow energy storage battery

A liquid flow energy storage battery and composite electrode technology, which is applied to battery electrodes, regenerative fuel cells, circuits, etc., can solve the problems of limited improvement in voltage efficiency and energy efficiency, and achieve lower ohmic internal resistance, lower body resistance, The effect of simple electrode structure

Active Publication Date: 2014-03-12
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

However, the ohmic internal resistance of the all-vanadium redox flow energy storage battery mainly includes the bulk resistance of the electrode, bipolar plate, electrolyte and separator, and the contact resistance between the electrode and the bipolar plate.
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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  • Combined electrode for flow battery and flow energy storage battery
  • Combined electrode for flow battery and flow energy storage battery
  • Combined electrode for flow battery and flow energy storage battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The conductive layer of the electrode is a non-porous graphite plate with a thickness of 2mm and a bulk density of 2.0gcm -3 ; The catalytic layer is made of carbon felt with a thickness of 3mm and a bulk density of 0.14gcm -3 ; The electrode adopts a non-integrated method, that is, the conductive layer and the catalytic layer are used independently.

[0034] When assembling the battery, according to the end plate, sealing gasket, current collector plate (bipolar plate), sealing gasket, electrode frame, sealing gasket, conductive layer, catalytic layer, membrane, catalytic layer, conductive layer, sealing gasket, The electrode frame, sealing gasket, current collector plate (bipolar plate), sealing gasket, and end plate are assembled together in sequence, and then assembled into an all-vanadium redox flow single cell under the compression of the end plate. Wherein, in the electrode frame, the side of the bipolar plate is a conductive layer, and the side of the membrane ...

Embodiment 2

[0041] The conductive layer of the electrode is a flexible graphite plate with a thickness of 3mm and a bulk density of 1.0gcm -3 , the porosity is 50%; the catalytic layer is carbon felt, 3mm thick, and the bulk density is 0.14gcm -3 ; The electrode adopts a non-integrated method, that is, the conductive layer and the catalytic layer are used independently.

[0042] When assembling the battery, according to the end plate, sealing gasket, current collector plate (bipolar plate), sealing gasket, electrode frame, sealing gasket, conductive layer, catalytic layer, membrane, catalytic layer, conductive layer, sealing gasket, Electrode frame, sealing gasket, current collecting plate (bipolar plate), sealing gasket, electrode frame, sealing gasket…the sequence of current collecting plate (bipolar plate), sealing gasket and end plate assembles each component in Together, and then assembled into an all-vanadium redox flow battery pack under the compression of the end plates. Wherein...

Embodiment 3

[0045] The conductive layer of the electrode is graphite felt with a thickness of 3mm and a bulk density of 0.4gcm -3 ; The catalytic layer is made of carbon felt with a thickness of 2mm and a bulk density of 0.14gcm -3 ; The electrode adopts a non-integrated method, that is, the conductive layer and the catalytic layer are used independently.

[0046] When assembling the battery, according to the end plate, sealing gasket, current collector plate (bipolar plate), sealing gasket, electrode frame, sealing gasket, conductive layer, catalytic layer, membrane, catalytic layer, conductive layer, sealing gasket, The electrode frame, sealing gasket, current collector plate (bipolar plate), sealing gasket, and end plate are assembled together in sequence, and then assembled into an all-vanadium redox flow single cell under the compression of the end plate. Wherein, in the electrode frame, the side of the bipolar plate is a conductive layer, and the side of the membrane is a catalytic...

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Abstract

The invention relates to a combined electrode for a flow energy storage battery and a flow energy storage battery containing the combined electrode. The combined electrode comprises a conducting layer and a catalyst layer which are superimposed mutually. The thickness of the conducting layer is 10-90% of the total thickness of the electrode. The conducting layer is made of carbon materials with good conductivity and low porosity. The catalyst layer is made of carbon materials with high electrocatalytic activity and high porosity. The self resistance of the electrode and the contact resistance between bipolar plates of the electrode are decreased, and finally the Ohm internal resistance of the flow energy storage battery is decreased. The energy efficiency and the voltage efficiency of the flow energy storage battery are raised, and therefore the working current density is raised, thus, the weight, the volume and the cost of the battery with the same output power are all decreased greatly.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to an electrode of an all-vanadium flow energy storage battery. Background technique [0002] All-vanadium redox flow energy storage battery has independent output power and capacity, flexible system design; high energy efficiency, long life, high operation stability and reliability, low self-discharge; large degree of freedom in site selection, no pollution, easy maintenance It has the advantages of simplicity, 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 generation systems such as solar energy and wind energy. There are significant demands in renewable energy power generation and smart grid construction. [0003] Different from the function of ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/86H01M8/18
CPCY02E60/528H01M4/8605H01M4/8673H01M8/18Y02E60/50
Inventor 张华民刘涛姚川
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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