Application of additive in negative electrode electrolyte of alkaline zinc-nickel flow battery

A negative electrode electrolyte and flow battery technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve problems such as hydrogen evolution side reactions, achieve improved battery performance, poor short-term high-efficiency cycle stability, and improve Coulombic efficiency.

Inactive Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of hydrogen evolution side reaction at the negative electrode during battery charging

Method used

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  • Application of additive in negative electrode electrolyte of alkaline zinc-nickel flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add the lead nitrate that final concentration is 0.03mol / L with the negative electrode electrolyte of comparative example 1, battery 40mA / cm 2 See Table 1 for running performance indicators.

[0020] As shown in Table 1, after the introduction of divalent lead ions into the negative electrode electrolyte of the battery, the coulombic efficiency of the battery increases, and the coulombic efficiency of the battery decreases after the battery runs to 400 cycles.

[0021] The additive has higher hydrogen evolution overpotential and deposition potential higher than zinc ion deposition potential. During the charging process of the battery, a small amount of side reaction of hydrogen evolution will occur at the negative electrode, which will affect the performance of the battery. After adding this additive, at the initial stage of charging, the divalent lead ions in the solution will preferentially obtain electrons and become lead simple substance and deposit on the negative ...

Embodiment 2

[0025] The difference from Comparative Example 1 is that: tin nitrate with a final concentration of 0.03mol / L is added to the negative electrode electrolyte, and the battery is 40mA / cm 2 See Table 2 for running performance indicators.

[0026] As shown in Table 2, after introducing divalent tin ions into the negative electrode electrolyte of the battery, the coulombic efficiency of the battery is significantly improved.

[0027] The additive has stable properties in alkaline solution, high hydrogen evolution overpotential and deposition potential higher than zinc ion deposition potential. During the charging process of the battery, a small amount of side reaction of hydrogen evolution will occur at the negative electrode, which will affect the performance of the battery. After adding this additive, at the initial stage of charging, the divalent tin ions in the solution will preferentially obtain electrons and become simple tin to deposit on the negative electrode. It is very ...

Embodiment 3

[0031] The difference from Comparative Example 1 is that: lead nitrate with a final concentration of 0.015mol / L and tin nitrate with a final concentration of 0.015mol / L are added to the negative electrode electrolyte, and the battery is 40mA / cm 2 The operating performance indicators are shown in Table 3.

[0032] As shown in Table 3, after introducing divalent lead ions and divalent tin ions into the battery negative electrolyte, the coulombic efficiency of the battery is higher than when no other ions are introduced, lead ions and tin ions are introduced alone.

[0033] The additive has stable properties in alkaline solution, high hydrogen evolution overpotential and deposition potential higher than zinc ion deposition potential. During the charging process of the battery, a small amount of side reaction of hydrogen evolution will occur at the negative electrode, which will affect the performance of the battery. After adding this additive, at the initial stage of charging, th...

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Abstract

The invention relates to application of a metal ion additive which is stable in an alkaline solution and has high hydrogen evolution overpotential in a zinc-nickel flow battery, which belongs to the field of flow batteries. The additive is one or more of divalent soluble lead salt and divalent soluble tin salt. The additive is stable in property in an alkaline solution and has high hydrogen evolution overpotential, and the deposition potential is higher than that of zinc ions. In the battery charging process, the negative electrode generates a small amount of hydrogen evolution side reaction,battery performance is influenced, after the additive is added, in the initial stage of charging, divalent lead ions and divalent tin ions in a solution can preferentially obtain electrons to become elemental lead to be deposited on a negative electrode, hydrogen evolution side reaction during zinc deposition is inhibited due to high hydrogen evolution overpotential of the elemental lead and the elemental tin, and when the two ions are introduced together, the effect is optimal, so that the coulombic efficiency of the battery is improved by the method.

Description

technical field [0001] The invention relates to the technical field of zinc-nickel flow batteries, and specifically designs the electrolyte technology of alkaline zinc-nickel flow batteries. [0002] technical background [0003] Alkaline zinc-nickel flow battery is a new type of low-cost, high-efficiency, and environment-friendly flow energy storage battery, which has the advantages of high energy density and current efficiency, simple and easy-to-operate device, long service life, and low cost. It is mainly used in power grid peak shaving, renewable energy power generation such as wind energy and solar energy, electric vehicles and other fields. [0004] For alkaline zinc-nickel flow batteries, the poor stability of the zinc anode has been an important factor restricting the development of this type of battery. The anode material of nickel flow battery is generally carbon felt or nickel foam. The hydrogen evolution overpotential of this kind of anode is very low, and hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 宋杨李先锋张华民赖勤志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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