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Positive electrode electrolyte for zinc-manganese flow battery

A positive electrolyte and flow battery technology, which is applied in the field of positive electrolyte for zinc-manganese flow batteries, can solve the problems of short life and low battery performance, achieve low cost, improve performance and cycle life, and eliminate manganese dioxide The generated effect of

Pending Publication Date: 2022-04-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a positive electrode electrolyte for zinc-manganese flow batteries, which solves the problems of low battery performance and short life caused by the disproportionation reaction of trivalent manganese ions

Method used

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  • Positive electrode electrolyte for zinc-manganese flow battery
  • Positive electrode electrolyte for zinc-manganese flow battery
  • Positive electrode electrolyte for zinc-manganese flow battery

Examples

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Effect test

Embodiment 1

[0034] In this embodiment, the positive electrode electrolyte of the zinc-manganese redox flow battery includes: manganese sulfate, sulfosalicylic acid with a pH of 5 as an additive, potassium sulfate as a supporting electrolyte, and deionized water as a solvent. Among them, the concentrations of manganese sulfate, sulfosalicylic acid and potassium sulfate are all 0.5mol / L, and the positive and negative electrodes and the proton exchange membrane area are both 2×2cm 2 .

[0035] The specific configuration steps of the positive electrode electrolyte are: weigh 6.35g of sulfosalicylic acid particles in a beaker and dissolve them with deionized water, continuously add potassium hydroxide until the pH is 5, then weigh 4.225g of manganese sulfate and dissolve them with deionized water; Pour the above solution into a 50mL volumetric flask, dilute to 50mL with deionized water and mix well.

[0036] Negative Electrolyte ZnCl 2 Concentration is 0.5mol / L, supporting electrolyte potass...

Embodiment 2

[0042] In this embodiment, in order to further improve the utilization rate of the electrolyte, the positive and negative electrodes and the proton exchange membrane area are selected to be 4×7cm 2 , other conditions are identical with embodiment 1.

[0043] Such as Figure 4 As shown in (a), at 10mA cm -2 When sulfosalicylic acid is added to the manganese sulfate system flow battery under the conditions of current density and charging for 5 minutes, the flow battery can stably cycle 300 times and ensure no decay in Coulombic efficiency. As shown in Figure 4(b), when the current density increases to 20mA cm -2 , and keep charging for 5 minutes, the cycle life of the flow battery at this time is reduced to more than 150 cycles due to the increase in capacity utilization. In general, flow batteries can still maintain stable operation when capacity utilization is increased.

Embodiment 3

[0045] In this embodiment, in order to further improve the cycle life of the battery, other conditions were kept the same as in Embodiment 2, and a constant temperature water bath was used to keep the temperature of the positive and negative electrolytes of the flow battery at 33°C. The result is as Figure 5 shown at 20mAcm -2 When sulfosalicylic acid is added to the manganese sulfate system flow battery under the condition of current density and charging for 5 minutes, the life of the flow battery is 300 cycles, which is doubled compared with the cycle life of the battery at room temperature, while maintaining the energy efficiency of 70 %above.

[0046] The results of the examples show that the positive electrode electrolyte used in the zinc-manganese redox flow battery of the present invention adopts manganese sulfate as the positive electrode active material, sulfosalicylic acid as the additive, potassium sulfate as the supporting electrolyte, and manganese sulfate as th...

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Abstract

The invention is applied to the field of zinc-manganese flow batteries, and particularly relates to a positive electrode electrolyte for a zinc-manganese flow battery. An electrolyte in a positive electrode electrolyte of the zinc-manganese flow battery comprises a manganese salt, an additive and a supporting electrolyte, the manganese salt is one or two of manganese sulfate, manganese chloride and manganese nitrate, the additive is sulfosalicylic acid, and the supporting electrolyte is potassium ions or sodium ions. By selecting the additive and utilizing the complexing structure of the divalent manganese ions and the additive, the disproportionation reaction of the trivalent manganese ions is changed and inhibited, the generation of manganese dioxide is avoided, the performance of the battery is improved, and the cycle life of the battery is prolonged. The invention has the advantages of outstanding performance, safety, environmental protection and the like.

Description

technical field [0001] The invention is applied in the field of zinc-manganese flow batteries, and in particular relates to a positive electrode electrolyte for zinc-manganese flow batteries. Background technique [0002] At present, the relatively mature flow battery systems mainly include all-vanadium flow batteries, zinc-bromine flow batteries and iron-chromium flow batteries. Among them, the vanadium redox flow battery has increased costs due to the rise in vanadium prices, and at the same time, it uses a higher concentration of sulfuric acid, which is likely to cause corrosion problems in the pipeline; the zinc-bromine redox flow battery has slow reaction kinetics at the bromine positive electrode, and it is difficult to treat the bromine element. ; The hydrolytic interpenetration of iron-chromium flow battery is serious, and the reaction kinetics of chromium cathode is slow. [0003] Zinc-manganese flow batteries have attracted great attention because of their low c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0002Y02E60/50
Inventor 唐奡于潇李瑛
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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