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Activation method for graphite felt electrode material for iron-chromium flow cell

A liquid flow battery and electrode material technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of poor performance and poor kinetic performance of iron-chromium batteries, and achieve improved electrochemical performance, enhanced stability, The effect of improving electrochemical activity

Active Publication Date: 2019-07-19
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the kinetic performance of the graphite felt electrode for the redox reaction of iron-chromium ions is poor, resulting in poor performance of the iron-chromium battery

Method used

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  • Activation method for graphite felt electrode material for iron-chromium flow cell
  • Activation method for graphite felt electrode material for iron-chromium flow cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The amount of silica sol added is 25% of the mass of graphite felt. Add deionized water to the silica sol to 50mL, and disperse it with ultrasonic waves for 30min; impregnate the cleaned and pretreated graphite felt (5mm thick, 30mm×30mm) to the diluted In the silica sol, use an ultrasonic cleaner to ultrasonically disperse at a frequency of 10kHz for 30min; dry the impregnated graphite felt in a blast drying oven at 80°C for 24h, and then place it in a muffle furnace at a rate of 5°C / min Heating at a heating rate of 500° C. and maintaining the temperature for 5 hours to obtain a 25 wt % silica sol activated graphite felt electrode. Use the above-mentioned treated graphite felt as the electrode of the iron-chromium redox flow battery to assemble a single cell, and the 2 The charge and discharge test is carried out at a current density of 60mA / cm 2 The charging capacity reaches 1240.9mAh, which is 9.55% higher than that of single cells assembled with untreated graphite ...

Embodiment 2

[0032] The amount of silica sol added is 50% of the mass of graphite felt. Add deionized water to the silica sol to 50mL, and disperse it with ultrasonic waves for 30min; impregnate the cleaned and pretreated graphite felt (5mm thick, 30mm×30mm) to the diluted In the silica sol, use an ultrasonic cleaner to ultrasonically disperse at a frequency of 10kHz for 30min; dry the impregnated graphite felt in a blast drying oven at 80°C for 24h, and then place it in a muffle furnace at a rate of 5°C / min The heating rate is heated to 500° C. and kept for 5 hours to obtain a 50 wt % silica sol activated graphite felt electrode. Use the above-mentioned treated graphite felt as the electrode of the iron-chromium redox flow battery to assemble a single cell, and the 2 Charge and discharge tests were performed at a current density of 60mA / cm compared to a single cell assembled with untreated graphite felt 2 The hourly Coulomb efficiency increased by 3.78%, the voltage efficiency increased ...

Embodiment 3

[0034] The amount of silica sol added is 75% of the mass of graphite felt. Add deionized water to the silica sol to 50mL, and disperse it with ultrasonic waves for 30min; impregnate the cleaned and pretreated graphite felt (5mm thick, 30mm×30mm) to the diluted In the silica sol, use an ultrasonic cleaner to ultrasonically disperse at a frequency of 10kHz for 30min; dry the impregnated graphite felt in a blast drying oven at 80°C for 24h, and then place it in a muffle furnace at a rate of 5°C / min The heating rate is heated to 500° C. and kept for 5 hours to obtain a 75wt% silica sol activated graphite felt electrode. Use the above-mentioned treated graphite felt as the electrode of the iron-chromium redox flow battery to assemble a single cell, and the 2 The charge-discharge test was carried out at a certain current density. After 20 charge-discharge cycles, the capacity retention rate was 31.37% higher than that of a single battery assembled with untreated graphite felt.

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Abstract

The invention discloses an activation method for a graphite felt electrode material for an iron-chromium flow cell. According to the method, graphite felt is dipped in silica sol, and the surface of graphite is etched through the thermal reduction method to obtain a graphite felt electrode for a modified iron-chromium redox flow cell. The preparation method comprises the following specific steps:1) preparing silica sol: dropwise adding hydrochloric acid into sodium silicate, performing continuous stirring, adjusting the pH value of the solution to be 2-4, and placing the solution silently for1-2 hours to obtain uniform transparent sol with viscosity; 2) fixing the volume of the silica sol by using deionized water, and performing ultrasonic dispersing for 30-50 minutes; 3) performing activation of the graphite felt: dipping the graphite felt subjected to cleaning pretreatment into the prepared silica sol, and performing ultrasonic dispersing for 30-50 minutes at the frequency of 1-100kHz by using an ultrasonic cleaner, and carrying out heat treatment in a muffle furnace at 400-550 DEG C for 5-15 hours to prepare the activated graphite felt. Compared with the prior art, the invention has the beneficial effect that the electrochemical activity of the graphite felt electrode of the iron-chromium redox flow cell is improved.

Description

technical field [0001] The invention relates to the field of redox flow batteries, in particular to an activation method for graphite felt electrode materials used in iron-chromium flow batteries. Background technique [0002] In recent years, wind energy and solar energy have been widely developed and utilized, but both wind energy and solar energy cannot be efficiently utilized due to the lack of large-scale energy storage batteries with excellent performance. Iron-chromium redox flow batteries have the advantages of energy and power separation, high energy efficiency, good safety, fast reaction speed, and long cycle time, which provide a more promising option for large-scale energy storage. [0003] The electrode, as a key component of FeCr redox flow batteries, plays an important role in determining the battery performance because it not only provides active sites for redox reactions but also affects ion / proton transport within the porous structure. Due to its good elec...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M4/88H01M4/8846H01M4/8882H01M4/96H01M8/188Y02E60/50
Inventor 张欢陈娜罗旭东肖涵谛黄忍
Owner UNIV OF SCI & TECH LIAONING