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Composite electrode for flow battery, flow battery and electric pile

A liquid flow battery and composite electrode technology, applied in battery electrodes, fuel cell parts, fuel cells, etc., can solve problems such as inability to operate stacks, improve output power and energy efficiency, and reduce dead zones and channeling Effect

Pending Publication Date: 2021-10-19
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the traditional stack design, it is necessary to balance the thickness, electrochemical activity, porosity and conductivity of the electrode, which is unfavorable to maximize the functions at the same time, so the stack cannot be used at high current density. run under

Method used

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  • Composite electrode for flow battery, flow battery and electric pile
  • Composite electrode for flow battery, flow battery and electric pile
  • Composite electrode for flow battery, flow battery and electric pile

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The structure of the stack 200 composed of the flow battery 100 provided in the first example of this embodiment is shown in image 3 middle. Specifically, a 2mm thick carbon felt is used as the reaction layer 2 of the positive electrode 20 and the negative electrode 30 of the flow battery 100, and a 3mm thick graphite felt is used as the distribution layer 1 of the positive electrode 20 and the negative electrode 30, and the electrode size is 200mm x 200mm. A flat carbon-plastic composite bipolar plate is used as the bipolar plate 110 , an electrode frame 40 with fluid distribution channels, and a seal 60 made of EPDM rubber are used. There are end plates 120 and interfaces 130 on the outside, and the above components are locked by bolts and compression plates. The porosity of the carbon felt in the present embodiment 1 is 90%, the activated carbon felt has a fiber diameter of 10 μm; the porosity of the graphite felt is 86%, the fiber diameter is 15 μm, and the surfac...

Embodiment 2

[0051] The difference between the electric stack 200 provided in this embodiment 2 and the embodiment 1 is that a 1.5 mm thick carbon felt is used as the reaction layer 2 of the positive electrode 20 and the negative electrode 30 of the flow battery 100, and a 3.5 mm thick graphite felt is used as the positive electrode 20 and the distribution layer 1 of the negative electrode 30 .

Embodiment 3

[0053] The difference between the electric stack 200 provided in this embodiment 3 and the embodiment 1 is that a 1 mm thick multi-layer carbon paper is used as the reaction layer 2 of the positive electrode 20 and the negative electrode 30 of the flow battery 100, and a 4 mm thick graphite felt is used as the positive electrode 20 and the distribution layer 1 of the negative electrode 30 . The porosity of the carbon paper in Example 3 is greater than 70%.

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Abstract

The invention relates to the technical field of energy storage, and discloses a composite electrode for a flow battery, the flow battery and an electric pile. The composite electrode comprises a distribution layer used for distributing electrolyte, and a reaction layer used for receiving the electrolyte of the distribution layer and providing an electrochemical reaction place for the electrolyte. An electrochemical reaction field and an electrolyte distribution field of the composite electrode can be effectively separated by arranging the distribution layer and the reaction layer, and the distribution layer can reduce dead zones and channeling caused by uneven flow distribution to a great extent; meanwhile, the distribution layer and the reaction layer can be specially designed (for example, a material with high electrochemical activity is adopted as the reaction layer, and a material with the characteristic of strengthening fluid flow distribution and excellent conductivity is adopted as the distribution layer); therefore, the output power and the energy efficiency of a battery and an electric pile using the composite electrode as a positive electrode and / or a negative electrode are improved.

Description

technical field [0001] The invention relates to the field of energy storage technology, in particular to a composite electrode for a flow battery, a flow battery and an electric stack. Background technique [0002] As a key technology to improve energy utilization, energy storage can improve the utilization rate of renewable energy and improve the stability of the power grid. Among them, flow batteries have become one of the main technologies for large-scale energy storage due to their advantages of long life, safety and reliability, and independent design of power and capacity. [0003] A flow battery is generally composed of a power unit and a capacity unit. As the electrolyte of the capacity unit, the storage and release of energy is realized by the change of the valence state of the active material. When working, the electrolyte flows through the inside of the stack as a power unit to convert electrical energy and chemical energy, thereby realizing power input and outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/023H01M8/0245H01M8/0258H01M4/86H01M8/18H01M8/2455
CPCH01M8/0258H01M8/023H01M8/0245H01M4/8657H01M4/8605H01M8/188H01M8/2455H01M8/18H01M4/86Y02E60/50
Inventor 范永生刘庆华马浩初缪平
Owner CHNA ENERGY INVESTMENT CORP LTD