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Negative electrode electrolyte for zinc-iron flow battery

An anode electrolyte, flow battery technology, applied in fuel cells, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of short cycle life, low battery performance, etc., to improve performance and cycle life, improve battery performance and cycle Longevity and the effect of reducing the generation of by-products

Pending Publication Date: 2022-05-27
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

[0005] The object of the present invention is to provide a negative electrode electrolyte solution for zinc-iron redox flow batteries, which solves the problems of low battery performance and short cycle life caused by the growth of zinc dendrites and the generation of by-products caused by hydrogen evolution side reactions

Method used

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  • Negative electrode electrolyte for zinc-iron flow battery
  • Negative electrode electrolyte for zinc-iron flow battery
  • Negative electrode electrolyte for zinc-iron flow battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] In this embodiment, the negative electrode electrolyte of the zinc-iron flow battery includes: zinc chloride, nicotinamide as an additive, potassium chloride as a supporting electrolyte, and deionized water as a solvent. Among them, the concentrations of zinc chloride, nicotinamide and potassium chloride were 0.5, 0.05, and 3 mol / L, respectively, and the areas of the positive and negative electrodes and the proton exchange membrane were both 4 × 7 cm. 2 .

[0035]The specific configuration steps of the negative electrolyte are as follows: Weigh 3.4g of zinc chloride particles in a beaker to dissolve in deionized water, then weigh 11.1g of potassium chloride to dissolve in deionized water, and then weigh 0.305g of nicotinamide to dissolve in deionized water Dissolve; pour the above solution into a 50mL volumetric flask, dilute to 50mL with deionized water and mix well.

[0036] Positive Electrolyte K 4 Fe(CN) 6 ·3H 2 The O concentration is 0.5mol / L, the supporting el...

Embodiment 2

[0042] In this example, the conditions were the same as those in Example 1.

[0043] like Figure 4 (a), at 20mA cm -2 Under the conditions of current density, charging for 45min and then discharging to 0.5V for 15h, when nicotinamide is not added to the zinc chloride system flow battery, the coulombic efficiency of the flow battery is seriously attenuated, and the capacity retention rate is 63.9%. After adding nicotinamide to the zinc chloride system flow battery, such as Figure 4 As shown in (b), the coulombic efficiency of the flow battery at this time is almost not attenuated, and the capacity retention rate is 98.9%. In general, the addition of nicotinamide inhibits the side reaction of hydrogen evolution, reduces the generation of by-products, and ensures that the battery does not fail.

Embodiment 3

[0045] In this example, a constant temperature water bath was used to keep the temperature of the positive and negative electrolytes of the flow battery at 33°C, and other conditions were the same as those in Example 2. The result is as Figure 5 (a), at 20mA cm -2 When no nicotinamide is added to the zinc chloride system flow battery under the conditions of current density and charging for 10 minutes, the life of the flow battery is 200 cycles, and the battery cycle stability is poor and cannot guarantee long-term cycling. After adding nicotinamide to the zinc chloride system flow battery, such as Figure 5 As shown in (b), the cycle life of the battery is improved to 300 cycles while maintaining an energy efficiency of 85%. And the Coulomb efficiency is 100% without fluctuation, and the cycle stability and reversibility of the flow battery are significantly improved.

[0046] The results of the examples show that the negative electrode electrolyte used in the present inve...

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Abstract

The invention is applied to the field of zinc-iron flow batteries, and particularly relates to a negative electrode electrolyte for a zinc-iron flow battery. An electrolyte in a negative electrode electrolyte of the zinc-iron flow battery comprises a zinc salt, an additive and a supporting electrolyte, the zinc salt is one or two of zinc chloride, zinc bromide, zinc sulfate and zinc iodide, the additive is nicotinamide, and the supporting electrolyte is potassium ions or sodium ions. According to the invention, by selecting the additive and utilizing the complexing structure of divalent zinc ions and the additive and the adsorption effect of a zinc deposition layer and the additive, the growth of zinc dendrites and the generation of byproducts are inhibited, the zinc deposition morphology is improved, the zinc deposition is compact and uniform, 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, low price and the like.

Description

technical field [0001] The invention is applied in the field of zinc-iron liquid flow batteries, and particularly relates to a negative electrode electrolyte for zinc-iron liquid flow batteries. Background technique [0002] Energy is an important foundation for the sustainable development of the national economy and national security. With the development of the economy, the demand for energy is increasing day by day, and the environmental pressure caused by the massive consumption of fossil energy is becoming more and more prominent. Large-scale utilization of renewable energy to achieve energy diversification has become an important strategy for energy security and sustainable development in all countries in the world. However, the large-scale integration of renewable energy into the power grid will have a serious impact on the safe and stable operation of the power grid. Energy technology is the key bottleneck technology to solve the discontinuous and unstable renewable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0025Y02E60/50
Inventor 唐奡杨静李瑛
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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