Gradient electrode for negative electrode of deposition type flow battery, and application thereof

A flow battery, deposition-type technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve problems such as limiting battery performance, increasing battery ohmic loss, and increasing battery ion transmission paths, reducing ohmic loss, promoting The effect of uniform deposition and shortened ion transmission path

Active Publication Date: 2020-08-07
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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  • Gradient electrode for negative electrode of deposition type flow battery, and application thereof
  • Gradient electrode for negative electrode of deposition type flow battery, and application thereof

Examples

Experimental program
Comparison scheme
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. A carbon fiber mat with a porosity of 95%, an average pore diameter of 300 μm, a ratio of oxygen-containing functional groups to the total number of atoms of 1.2%, and a thickness of 2 mm is selected for the diaphragm side, and a porosity of 86%, an average pore diameter of 80 μm, and the number of oxygen-containing functional groups are selected for the middle layer. The carbon fiber felt with a ratio of 4.5% to the total number of atoms and a thickness of 2 mm is selected from the side of the bipolar plate with a porosity of 70%, an average pore diameter of 40 μm, and a carbon fiber felt with a ratio of 9.5% of the number of oxygen-containing functional groups to the total number of atoms and a thickness of 2 mm. With a needle punching density of 200 needles / cm 2 Acupuncture machine will needle them into one piece. Under the compression ...

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 mats 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. Laser etching is used on the side of the diaphragm to have 25 through holes with a diameter of 1mm per square centimeter, and the middle layer is laser etched to have 12 through holes with a diameter of 1mm per square centimeter. Heat treatment (air heating at 500°C for 8 hours) to increase the number of oxygen-containing functional groups to 8% of the total number of atoms, and use a needle punching density of 100 needles / cm 2 Acupuncture machine will needle them into one piece. Under the compression of the end plate, it is assembled into a zinc-bromine flow battery with a flow-through structure. After compression...

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. A carbon fiber mat 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 diameter 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 on the bipolar plate side. Carbon fiber felt with an average pore size of 30 μm and a thickness of 2 mm. Electrodeposit 40wt% metal bismuth on the carbon fiber felt on the side of the bipolar plate, and 15wt% metal bismuth on the carbon fiber felt on the middle layer, without treatment on the side of the diaphragm, and use a needle punching density of 200 needles / cm 2 Acupuncture machine will needle them into one piece. Under the compression of the end plate, it is assembled into a tin-iron flow battery with a f...

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Abstract

The invention relates to the technical field of flow batteries in the energy storage technology, particularly to a gradient electrode for a negative electrode of a deposition type flow battery, and application thereof. According to the invention, the porosity and/or the number of deposition sites of a gradient electrode change along the direction perpendicular to the surface of the electrode in agradient manner, and the electrode has high porosity and low deposition site number at a diaphragm side and has low porosity and high deposition site number at a bipolar plate side, such that the uniform deposition of the active substance to the bipolar plate side during a charging process of a deposition type flow battery is promoted, the dendritic crystal growth is inhibited, and the charging capacity and the cycle stability of the battery are improved; the electrode can be applied to a deposition type flow battery taking zinc, iron, copper, tin, cadmium or lead as an active substance; and when the electrode is applied to a zinc-iodine flow battery, the capacity of zinc capable of being deposited in unit area on the negative electrode side reaches up to 280 mAh/cm<2> and is 6 times thatof a traditional electrode.

Description

technical field [0001] The invention relates to the technical field of flow batteries in energy storage technology, in particular to a gradient electrode used for the negative electrode of a deposition type 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 energy and solar energy has been vigorously developed, but it is still facing serious problems such as wind and solar abandonment in the world. The reason for this problem is that renewable energy often has the characteristics of intermittent, fluctuating, and strong time-varying, and the electricity generated by it directly connected to the grid will have a great impact on the safe and stable operation of the grid. In order to solve this problem,...

Claims

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Application Information

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Patent Type & Authority Applications(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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