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A gradient electrode for deposition type flow battery negative electrode and its application

A liquid flow battery and deposition-type technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve problems such as limiting battery performance, improving battery ohmic loss, and increasing battery ion transmission paths, so as to reduce ohmic loss and promote Effect of uniform deposition and shortened ion transport path

Active Publication Date: 2022-07-29
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will increase the ion transmission path in the battery, increase the ohmic loss of the battery, and limit the improvement of battery performance.

Method used

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  • A gradient electrode for deposition type flow battery negative electrode and its application
  • A gradient electrode for deposition type flow battery negative electrode and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, a gradient electrode with a step gradient is used for the negative electrode of a deposition type flow battery. On the diaphragm side, a carbon fiber felt with a porosity of 95%, an average pore diameter of 300 μm, the number of oxygen-containing functional groups accounting for 1.2% of the total number of atoms, and a thickness of 2 mm was selected. The carbon fiber felt with a porosity of 70%, an average pore diameter of 40 μm, the number of oxygen-containing functional groups accounting for 9.5% of the total number of atoms, and a thickness of 2 mm was selected from the bipolar plate side, accounting for 4.5% of the total number of atoms and a thickness of 2 mm. The needle punch density is 200 needles / cm 2 The needle punching machine will needle it into one. A zinc-iodine flow battery with a flow-through structure is assembled under the compression of the end plate, the electrode thickness after compression is 4mm, and the electrode area is 4cm ...

Embodiment 2

[0034] In this embodiment, a gradient electrode with a step gradient is used for the negative electrode of a deposition type flow battery. Three carbon fiber felts with a porosity of 70%, an average pore diameter of 40 μm, a ratio of oxygen-containing functional groups to the total number of atoms of 1.2%, and a thickness of 2 mm were selected as initial electrodes. Use laser etching on the diaphragm side to have 25 through holes with a diameter of 1mm per square centimeter, use laser etching for the intermediate layer to have 12 through holes with a diameter of 1mm per square centimeter, and use heat treatment (air) on the side of the bipolar plate. heating at 500 °C for 8 hours) to increase the proportion of oxygen-containing functional groups to the total number of atoms to 8%, with a needle punching density of 100 needles / cm 2 The needle punching machine will needle it into one. A zinc-bromine flow battery with a permeable structure is assembled under the compression of t...

Embodiment 3

[0036] In this embodiment, a gradient electrode with a step gradient is used for the negative electrode of a deposition type flow battery. The carbon fiber felt with a porosity of 97%, an average pore diameter of 350 μm and a thickness of 2 mm is selected on the diaphragm side, a carbon fiber felt with a porosity of 84%, an average pore size of 70 μm and a thickness of 2 mm is selected for the middle layer, and a porosity of 60% and a thickness of 2 mm are selected from the bipolar plate side. A carbon fiber felt with an average pore diameter of 30 μm and a thickness of 2 mm. 40wt% metal bismuth was electrodeposited on the carbon fiber felt on the bipolar plate side, 15wt% metal bismuth was electrodeposited on the carbon fiber felt in the middle layer, and the diaphragm side was not treated, and the needle punch density was 200 needles / cm 2 The needle punching machine will needle it into one. A tin-iron flow battery with a flow-through structure is assembled under the compres...

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Abstract

The invention relates to the technical field of liquid flow batteries in energy storage technology, in particular to a gradient electrode used for a negative electrode of a deposition type liquid flow battery and its application. Gradient electrodes vary in porosity and / or number of deposition sites along a gradient in a direction perpendicular to the electrode surface, by having electrodes with high porosity and low number of deposition sites on the diaphragm side and low porosity on the bipolar plate side And the high number of deposition sites promotes the uniform deposition of active materials to the bipolar plate side during the charging process of the deposition-type flow battery, inhibits the growth of dendrites, and improves the charging capacity and cycle stability of the battery. The above electrodes can be applied to deposition type flow batteries using zinc, iron, copper, tin, cadmium or lead as active materials. When applied to a zinc-iodine flow battery, the capacity of zinc deposited per unit area on the negative side is as high as 280mAh / cm 2 , which is 6 times that of using traditional electrodes.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries in energy storage technology, in particular to a gradient electrode used for a negative electrode of a deposition type liquid flow battery and its application. Background technique [0002] The development and utilization of renewable energy is an important measure to solve the problems of energy shortage and environmental pollution, and it is also an important part of my country's energy strategy. In recent years, renewable energy represented by wind and solar energy has been vigorously developed, but at present, there are still serious problems such as abandoning wind and solar energy worldwide. The reason for this problem is that renewable energy often has the characteristics of intermittent, fluctuating and time-varying, and the direct grid connection of the generated electricity will have a great impact on the safe and stable operation of the power grid. To solve this problem, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M8/18
CPCH01M4/861H01M4/8636H01M8/188Y02E60/50
Inventor 赵天寿蒋浩然范新庄
Owner THE HONG KONG UNIV OF SCI & TECH
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