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Preparation method of long-life neutral zinc-iron flow battery

A flow battery, long-life technology, used in water-based electrolyte fuel cells, fuel cells, battery electrodes, etc., can solve problems such as low Coulomb efficiency and poor cycle life, achieve good application prospects, low cost, and solve the problem of rapid capacity decline Effect

Pending Publication Date: 2020-12-18
山东奥德储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its large-scale application is also limited by the low Coulombic efficiency and poor cycle life caused by dendrite growth during battery cycling.

Method used

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  • Preparation method of long-life neutral zinc-iron flow battery
  • Preparation method of long-life neutral zinc-iron flow battery
  • Preparation method of long-life neutral zinc-iron flow battery

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preparation example Construction

[0031] In the specific implementation process, the preparation method of the long-life neutral zinc-iron flow battery of the present invention includes the following process and testing steps:

[0032] (1) Preparation of positive electrode electrolyte (ferricyanide solution): use deionized water to prepare a certain concentration of ferricyanide (such as: K 3 Fe(CN) 6 、K 4 Fe(CN) 6 、Na 3 Fe(CN) 6 etc.) solutions and halides (such as: NaBr, KBr, CaBr 2 , MgBr2 , NaCl, KCl, MgCl 2 , CaCl 2 , NaI, KI, AgI, etc.) solution.

[0033] (2) Preparation of negative electrode electrolyte: use deionized water to prepare a series of halides of different concentrations (such as: NaBr, KBr, CaBr 2 , MgBr 2 , NaCl, KCl, MgCl 2 , CaCl 2 , NaI, KI, AgI, etc.) solution.

[0034] (3) Battery assembly: immerse a certain amount of ion-exchange membrane in a certain concentration of KOH (or NaOH) aqueous solution (0.1-5mol / L), cook at a constant temperature of 50-100°C for 1-3 hours to o...

Embodiment 1

[0041] In this embodiment, the preparation method of the long-life neutral zinc-iron flow battery includes the following process and testing steps:

[0042] (1) Preparation of electrolyte:

[0043] Prepare 0.1mol L -1 K 3 [Fe(CN) 6 ] Aqueous solution 15mL is used as the positive electrode electrolyte, and the positive electrode supporting electrolyte is 3mol L -1 10 mL of KBr aqueous solution was placed in the positive electrode storage tank. Negative electrode electrolyte is 1, 2, 3, 4, 4.5mol L -1 KBr aqueous solution, get 60mL respectively and put in respective negative electrode storage tanks.

[0044] (2) Separator material processing and battery assembly

[0045] Put the metal cation exchange membrane in 1mol / L KOH alkaline aqueous solution, keep the temperature at 80°C for 1h, take it out and wash it, soak it in deionized water for later use. Take a zinc sheet with a thickness of 6 μm and cut it to a size of 3×4.5cm 2 The zinc sheet is polished clean, and used a...

Embodiment 2

[0048] In this embodiment, the preparation method of the long-life neutral zinc-iron flow battery includes the following process and testing steps:

[0049] (1) Preparation of electrolyte:

[0050] Prepare 0.1mol L -1 K 3 [Fe(CN) 6 ] Aqueous solution 15mL as positive electrode electrolyte, positive electrode supporting electrolyte is 3.0mol L -1 30 mL of KBr aqueous solution was placed in the positive electrode storage tank. The negative electrode electrolyte is 0.3mol L -1 ZnBr 2 Aqueous solution 20mL, 3.6mol L -1 40mL of KBr aqueous solution is placed in the negative electrode storage tank.

[0051] (2) Separator material processing and battery assembly

[0052] Put the metal cation exchange membrane in 1mol / L KOH alkaline aqueous solution, keep the temperature at 80°C for 1h, take it out and wash it, soak it in deionized water for later use. Take a zinc sheet with a thickness of 4 μm and cut it to a size of 3×4.5cm 2 The zinc flakes are polished clean, used as the...

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Abstract

The invention relates to the field of redox neutral zinc-iron flow batteries, in particular to a preparation method of a long-life neutral zinc-iron flow battery. The method comprises the following steps: (1) preparing a positive electrode electrolyte: preparing a solution of halide and ferricyanide by using deionized water; (2) preparing a negative electrode electrolyte: preparing a series of halide solutions with different concentrations by using deionized water; (3) battery assembly: immersing an ion exchange membrane into an alkaline solution, and keeping the temperature at 50-100 DEG C for 1-3 hours to obtain a metal cation exchange membrane; and cutting and polishing a zinc sheet to serve as a negative electrode reaction active substance of the battery; and (4) assembling the key materials obtained in the steps (1), (2) and (3) into the neutral zinc-iron flow battery. The neutral zinc-iron flow battery using the modified electrolyte can stably circulate for more than 1340 circlesunder the current density of 30mA cm < 2 >, and the capacity retention ratio is more than 80% while the coulombic efficiency is maintained at 100%.

Description

technical field [0001] The invention relates to the field of redox neutral zinc-iron flow batteries, in particular to a preparation method of a long-life neutral zinc-iron flow battery. Background technique [0002] With the depletion of traditional fossil fuels and serious environmental pollution, it is imperative to find new energy and develop new energy technologies. At present, electric energy is mainly provided by thermal power, wind power, hydraulic power and solar power generation methods. However, due to the serious environmental pollution caused by thermal power generation, renewable energy sources such as wind power, hydraulic power and solar power have the characteristics of intermittent and discontinuous, which cannot meet the direct In order to solve this problem, it is necessary to develop efficient and cheap energy storage devices. As a large-scale energy storage device, the liquid flow battery can fully meet the needs of the power grid and life, and has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M8/08
CPCH01M8/188H01M8/08H01M2004/8684H01M2300/0002Y02E60/50
Inventor 丁美杨明辉贾传坤
Owner 山东奥德储能科技有限公司
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