A kind of positive electrode material for zinc-bromine flow battery and its preparation and application

A zinc-bromine flow battery, cathode technology, applied in battery electrodes, regenerative fuel cells, circuits, etc., can solve problems such as poor effect

Active Publication Date: 2022-07-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As the main body of the battery, the positive electrode material currently mainly uses carbon materials as the catalytic material of the positive bromine element, and the effect is poor.

Method used

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  • A kind of positive electrode material for zinc-bromine flow battery and its preparation and application
  • A kind of positive electrode material for zinc-bromine flow battery and its preparation and application
  • A kind of positive electrode material for zinc-bromine flow battery and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 2 g of titanium dimethyl dithiocarbamate was placed under nitrogen, and the temperature was increased from room temperature to a sintering temperature of 500 degrees Celsius at a heating rate of 1 degree Celsius per minute. After sintering at 500 degrees Celsius for 1 h, the carbon-coated titanium sulfide was taken out. The material is agglomerated in granular form see figure 1 , the white particles are uncoated titanium sulfide. The prepared carbon-coated titanium disulfide material and the binder nafion were coated on 36cm in a ratio of 9:1. 2 On carbon felt (5mm thickness), the load is 2mg / cm 2 , as the positive electrode;

[0031] The negative electrode is 36cm 2 Carbon felt (5mm thickness) with nafion membrane as the diaphragm. Both positive and negative electrolytes were 60 ml of 2 mol / L zinc bromide solution. Through the circulation pipeline, it circulates between the liquid storage tank and the positive and negative electrodes of the battery. The battery ...

Embodiment 2

[0036] 2 g of titanium diethyldithiocarbamate was placed under nitrogen to heat up from room temperature to a sintering temperature of 700 degrees Celsius, and the heating rate was 10 degrees Celsius / min. After sintering at 700 degrees Celsius for 2 hours, the carbon-coated titanium sulfide was taken out. Material is agglomerated in granular form, see Figure 4 .

Embodiment 3

[0038] 2 g of titanium diethyldithiocarbamate was placed under nitrogen to heat up from room temperature to a sintering temperature of 1000 degrees Celsius, and the heating rate was 5 degrees Celsius / min. After sintering at 1000 degrees Celsius for 4 hours, the carbon-coated titanium sulfide was obtained. The material is agglomerated in granular form see Figure 5 , it can be clearly seen from the figure that the bright white is titanium sulfide, and the titanium sulfide is embedded in the carbon skeleton.

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Abstract

The invention relates to a positive electrode for a zinc-bromine flow battery. The positive electrode uses a conductive current collector as a substrate, and a catalytic material is supported on the substrate. The catalytic material is carbon-coated titanium disulfide, and the conductive current collector is used. For nickel foam or carbon felt. The present invention starts from the electrode. The electrode in the flow battery provides a reaction site for the electrochemical reaction. If the generated bromine element can be completely reacted during the discharge process, the concentration of bromine in the electrolyte solution in the subsequent cycle process will be greatly reduced, reducing the Osmotic contamination of elemental bromine.

Description

technical field [0001] The invention relates to the technical field of electrodes for zinc-bromine liquid flow batteries, in particular to a positive electrode material and a preparation technology for zinc-bromine liquid flow batteries. Background technique [0002] Compared with the all-vanadium flow battery, the zinc-bromine flow battery has the advantages of high energy density and low cost. The theoretical open circuit voltage of the zinc-bromine flow energy storage battery is about 1.80V, and the theoretical energy density is 430Wh / kg. The positive and negative electrodes of the zinc-bromine flow battery are separated by a separator, and the electrolyte solutions on both sides are ZnBr 2 solution. Under the action of the power pump, the electrolyte solution circulates in the closed circuit formed by the liquid storage tank and the battery. The potential difference between the positive and negative electrode pairs is the driving force for the reaction. The electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88H01M8/18
CPCY02E60/50
Inventor 赖勤志李先锋张华民许鹏程宋杨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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