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Positive electrode active material for zinc-bromine single-flow battery and preparation and application thereof

A positive electrode active material and liquid flow battery technology, applied in battery electrodes, regenerative fuel cells, circuits, etc., can solve the problems of aggravated positive electrode corrosion and high concentration of bromine

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also brings the problem that the concentration of bromine in the positive electrode is extremely high, and the corrosion of the positive electrode is aggravated.

Method used

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  • Positive electrode active material for zinc-bromine single-flow battery and preparation and application thereof
  • Positive electrode active material for zinc-bromine single-flow battery and preparation and application thereof
  • Positive electrode active material for zinc-bromine single-flow battery and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Potassium bromide and cuprous chloride were blended with deionized water at 50 degrees Celsius at a molar ratio of 2:1, and the concentration of bromide ions was 4M. Stir evenly, and the reaction time is 4 hours; after the reaction, centrifuge and dry at 80 degrees Celsius, see figure 1 , the material is spherical with a uniform particle size of 500-600nm.

[0032] The prepared cuprous bromide and glucose were blended in a molar ratio of 1:0.5, stirred at 5000 rpm by a high-speed ball mill for 1 hour, and then taken out.

[0033] The above materials are sintered in an inert atmosphere of argon, the sintering temperature is 1000 degrees Celsius, the heating rate is 10 degrees Celsius / min, the sintering temperature time is 1h, and then the carbon-coated cuprous bromide material is obtained, see figure 2 . It can be seen that there is a uniform carbon coating layer on the surface of the material, and the BET and pore size distribution of the carbon coating layer are sho...

Embodiment 2

[0040] Sodium bromide and cuprous sulfate are blended with deionized water at 30 degrees Celsius at a molar ratio of 4:1, and the concentration of bromide ions is 8M. Stir evenly, and the reaction time is 10 hours; after the reaction, centrifuge and dry at 80 degrees Celsius. The material is spherical with a uniform particle size of 500-600nm.

[0041] The prepared cuprous bromide and glucose were blended according to the molar ratio of 1:1, stirred at 10,000 rpm by a high-speed ball mill for 4 hours, and then taken out.

[0042] Place the above material in an inert atmosphere of nitrogen for sintering, the sintering temperature is 500°C, the heating rate is 1°C / min, and the sintering temperature time is 4h, then take out the carbon-coated cuprous bromide material, see Figure 4 , it can be seen that unlike Example 1, the material prepared in Example 2 is a regular and compact spherical shape.

Embodiment 3

[0044] Blend 1:1 potassium bromide and sodium bromide with 1:1 cuprous sulfate and cuprous chloride at a molar ratio of 3:1 with deionized water at 40 degrees Celsius, with a bromide ion concentration of 6M. Stir evenly, and the reaction time is 5 hours; after the reaction, centrifuge and dry at 80°C. The material is in the shape of a rod with a uniform particle size of 900-1000nm.

[0045] The prepared cuprous bromide and glucose were blended in a molar ratio of 1:0.75, stirred at 7500 rpm by a high-speed ball mill for 2 hours, and then taken out.

[0046] The above materials are sintered in an inert atmosphere of argon, the sintering temperature is 700 degrees Celsius, the heating rate is 5 degrees Celsius / minute, the sintering temperature time is 2h, and then the carbon-coated cuprous bromide material is obtained, see Figure 5 , it can be seen that the material synthesized in Example 3 is rod-shaped.

[0047] As can be seen from the above examples, the structure and morpho...

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Abstract

The invention relates to a positive electrode active material for a zinc-bromine single-flow battery. The positive electrode material is carbon-coated cuprous bromide, and the mass ratio of carbon tocuprous bromide is 1:10 to 1:20. The positive active material is used as an active material in the positive electrode of the zinc-bromine single-flow battery. The problem of serious corrosion of the positive electrode of the zinc-bromine single-flow battery is solved.

Description

technical field [0001] The invention relates to the technical field of electrodes for zinc-bromine single-flow batteries, in particular to positive electrode materials and preparation techniques for zinc-bromine single-flow batteries. Background technique [0002] Zinc-bromine flow batteries have the advantages of high energy density and low cost compared with all-vanadium flow batteries. 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 solution on both sides is 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, and the electrode react...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M8/18
CPCY02E60/50
Inventor 赖勤志李先锋张华民许鹏程苑辰光刘新运郑建伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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