Current collection plate for all vanadium redox flow battery

A liquid flow battery and current collector technology, which is applied in fuel cells, battery electrodes, electrode carriers/collectors, etc., can solve problems such as easy deformation, poor charge and discharge capacity, and difficult sealing of batteries, and achieve high rigidity and strength. The effect of stable chemical performance and strong charge and discharge ability

Inactive Publication Date: 2006-10-11
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ①The conductive plastic current collecting plate has high resistance and unstable chemical properties, and the all-vanadium redox flow battery using conductive plastic plate as the current collecting plate has poor ability to withstand large current charge and discharge;
[0006] ②The rigidity and strength of the conductive plastic collector plate are not strong and easy to deform, which makes it difficult to seal the all-vanadium redox flow battery and cause serious battery leakage;
[0007] ③Because there is no designed flow field for the collector plate of the all-vanadium redox flow battery, the electrolyte does not flow smoothly inside the battery, and it is easy to form a "dead angle" where no electrolyte flows, and the battery is severely polarized

Method used

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  • Current collection plate for all vanadium redox flow battery
  • Current collection plate for all vanadium redox flow battery
  • Current collection plate for all vanadium redox flow battery

Examples

Experimental program
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Effect test

example 1

[0019] Example 1: A high-density graphite plate impregnated with epoxy resin is used as a collector plate, and a serpentine flow field is engraved on the collector plate. The length of the flow field is 120mm, the width is 120mm, and the width of the outer edge 8 of the flow field is 15mm ; The ratio of ridge width to groove width in flow field is 1:6, and the ratio of groove depth to groove width in flow field is 1:5. The current collector plate, electrode and separator were assembled into an all-vanadium redox flow battery, and the charge and discharge test was carried out. The average coulombic efficiency of the first five charge and discharge was 89.1%.

example 2

[0020] Example 2: A high-density graphite plate impregnated with phenolic resin is used as a collector plate, and eight parallel serpentine flow fields are engraved on the collector plate. The length of the flow field is 120mm, the width is 170mm, and the width of the outer edge 8 of the flow field is 15mm ; The ratio of flow field ridge width to groove width is 1:0.5, and the ratio of flow field groove depth to groove width is 1:1. The current collector plate, electrode and separator were assembled into an all-vanadium redox flow battery, and the charge and discharge test was carried out. The average coulombic efficiency of the first five charge and discharge was 86.5%.

example 3

[0021] Example 3: A high-density graphite plate impregnated with epoxy resin is used as a collector plate, and four parallel serpentine flow fields are engraved on the collector plate. The length of the flow field is 260 mm, and the width is 260 mm. The width of the outer edge 8 of the flow field is 20mm; the ratio of flow field ridge width to groove width is 1:3.3, and the ratio of flow field groove depth to groove width is 1:3.3. The current collecting plate, electrode and diaphragm were assembled into an all-vanadium redox flow battery, and the charge and discharge test was carried out. The average coulombic efficiency of the first five charge and discharge was 95.8%.

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Abstract

The structure of a collecting board for full-vanadium redox fluid cell comprises: the high-density graphite plate dipped by epoxy resin or phenol resin, and a S-shaped flow field with width rate of ridge and channel as 1:0.5~6 and the rate between the channel depth to channel width as 1:1~5. The advantages of this invention include: 1) small resistance, stable chemical property, and strong ability to bear large current charge / discharge; 2) strong rigidity and intensity; 3) smooth flow of the electrolyte, and little polarization on cell.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and more specifically relates to a current collecting plate for an all-vanadium redox flow battery and the structural design of the flow field thereof. Background technique [0002] The all-vanadium redox flow battery uses VO 2+ / VO 2 + and V 2+ / V 3+ As the positive and negative electrode redox couples, the two are respectively prepared as electrolyte in the form of sulfate and stored in two liquid storage tanks. During operation, the electrolyte is transported to the anode chamber and cathode chamber separated by a diaphragm through a circulating pump. Charging and discharging in the battery. [0003] figure 1 It is a schematic diagram of the structure of the all-vanadium redox flow battery reported in the literature [ElectrochimicaActa, 47, 2001]. It consists of a current collector plate 1, an electrode 2 and a diaphragm 3 to form a single battery 4, which is stacked in p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M4/66H01M4/86H01M8/0234
CPCY02E60/10Y02E60/50
Inventor 邱新平吕正中武增华胡嵩麟陈立泉
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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