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A kind of cathode material for liquid flow battery and preparation method thereof

A flow battery and composite material technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of unfavorable flow battery cycle performance and insufficient stability of fluid electrodes, and achieve the suppression of shuttle effect, good fluidity and Electrochemical performance, the effect of improving electrical conductivity

Active Publication Date: 2021-01-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fluid electrode is not stable enough during charge and discharge, which is not conducive to improving the cycle performance of the flow battery.

Method used

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  • A kind of cathode material for liquid flow battery and preparation method thereof
  • A kind of cathode material for liquid flow battery and preparation method thereof
  • A kind of cathode material for liquid flow battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The sulfur-Ketjen black-graphene composite material of the present embodiment comprises a graphene layer and sulfur and Ketjen black arranged between the graphene layers; specifically, the multilayer graphene layer and the Ketjen black arranged between the graphene layers Black forms a three-dimensional network structure of carbon, and sulfur is evenly distributed in the three-dimensional network structure of carbon; the mass ratio of sulfur, Ketjen black, and graphene is 0.896:0.05:0.05.

[0053] The preparation method of the sulfur-ketjen black-graphene composite material of the present embodiment comprises the steps:

[0054] 1) Add 0.05g Ketjen Black to 100mL water, ultrasonically disperse for 30min to disperse Ketjen Black evenly in water, then add 3.48g Na 2 S 2 o 3 ·5H 2 O dispersed evenly to Na 2 S 2 o 3 ·5H 2 O was completely dissolved, then slowly added 5.55 g of concentrated hydrochloric acid with a mass fraction of 36%, and then vigorously stirred for...

Embodiment 2

[0060] The sulfur-Ketjen black-graphene composite material of the present embodiment comprises a graphene layer and sulfur and Ketjen black arranged between the graphene layers; specifically, the multilayer graphene layer and the Ketjen black arranged between the graphene layers Black forms a three-dimensional network structure of carbon, and sulfur is evenly distributed in the three-dimensional network structure of carbon; the mass ratio of sulfur, Ketjen black, and graphene is 0.64:0.03:0.02.

[0061] The preparation method of the sulfur-ketjen black-graphene composite material of the present embodiment comprises the steps:

[0062] 1) Add 0.03g Ketjen Black to 100mL water, ultrasonically disperse for 30min to disperse Ketjen Black evenly in water, then add 2.48g Na 2 S 2 o 3 ·5H 2 O dispersed evenly to Na 2 S 2 o 3 ·5H 2 O was completely dissolved, then slowly added 5.55 g of concentrated hydrochloric acid with a mass fraction of 36%, and then vigorously stirred for ...

Embodiment 3

[0068] The sulfur-Ketjen black-graphene composite material of the present embodiment comprises a graphene layer and sulfur and Ketjen black arranged between the graphene layers; specifically, the multilayer graphene layer and the Ketjen black arranged between the graphene layers Black forms a three-dimensional network structure of carbon, and sulfur is evenly distributed in the three-dimensional network structure of carbon; the mass ratio of sulfur, Ketjen black, and graphene is 1.28:0.1:0.1.

[0069] The preparation method of the sulfur-ketjen black-graphene composite material of the present embodiment comprises the steps:

[0070] 1) Add 0.1g Ketjen Black to 150mL water, ultrasonically disperse for 30min to disperse Ketjen Black evenly in water, then add 4.96g Na 2 S 2 o 3 ·5H 2 O dispersed evenly to Na 2 S 2 o 3 ·5H 2 O was completely dissolved, then slowly added 5.55 g of concentrated hydrochloric acid with a mass fraction of 36%, and then vigorously stirred for 6 h...

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Abstract

The present invention relates to sulfur-Ketjenblack-graphene composite material and preparation method thereof, positive electrode material for flow battery and preparation method thereof, flow cell.The invention belongs to the technical field of flow battery. The sulfur-Ketjenblack-graphene composite material provided by the present invention comprises graphene layers and sulfur and Ketjenblackprovided between the graphene layers. The mass ratio of the sulfur and the Ketjenblack and the graphene is 0.4-1.28: 0.02-0.2: 0.016-0.2. The fluid electrode made of the positive electrode material for flow battery has relatively high conductivity and stability, which owe to the continuous 3D conductive network formed from KB and rGO, such that the conductivity of the electrode is improved. Graphene of the outer layer effectively inhibits the shuttle effect of polysulfide.

Description

technical field [0001] The invention relates to a sulfur-ketjen black-graphene composite material and a preparation method thereof, a positive electrode material for a flow battery and a preparation method thereof, and a flow battery, belonging to the technical field of flow batteries. Background technique [0002] Electrochemical energy storage devices are of great interest for the utilization of unstable and intermittent renewable energies, such as solar and wind energy systems. Among different chemical energy storage devices, redox flow batteries have attracted attention due to their operational flexibility and easy scalability. Lithium-sulfur flow battery not only has the advantages of high energy density, clean and environmental protection of lithium-sulfur battery, but also has the characteristics of flow battery, which is a very promising energy storage technology. However, its cathode materials still have certain problems, such as poor conductivity and inevitable po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M8/18
CPCH01M4/8652H01M4/8657H01M8/188Y02E60/50
Inventor 张锁江徐松张兰张香平蔡迎军
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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