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Application of a zinc-bromine redox flow battery cathode electrolyte in batteries

A technology of zinc-bromine flow battery and positive electrode electrolyte, which is applied in the direction of regenerative fuel cells, etc., can solve the problems of affecting battery stability, blocking circulation pipelines, etc., and achieve the effects of inhibiting low-temperature precipitation, ensuring stable existence, and improving solubility

Active Publication Date: 2021-10-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the zinc-bromine flow battery electrolyte is an aqueous solution of zinc bromide and N-ethyl bromide, methylpyrrolidine (MEP), and the electrolyte will have precipitation during the low-temperature operation of the battery, which will block the circulation pipeline. Affect the stability of the battery

Method used

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  • Application of a zinc-bromine redox flow battery cathode electrolyte in batteries
  • Application of a zinc-bromine redox flow battery cathode electrolyte in batteries
  • Application of a zinc-bromine redox flow battery cathode electrolyte in batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Take 4 parts of 30mL anode electrolyte, the concentration of anode electrolyte is 2MZnBr 2 +3MKCl+0.4MMEP. Add 1.38mL of liquid bromine to the positive electrolyte (no additive is used as a blank sample), and then add 0.2moL / L of different additives to three of them. Put it into a constant temperature box and store it at 0°C for 12 hours, and observe the state of the positive electrode electrolyte. The effect of different additives on the low-temperature stability of the positive electrolyte of zinc-bromine flow battery was investigated.

[0016] The experimental results are shown in Table 1. As can be seen from Table 1, when no additives are added, precipitation occurs in the anode electrolyte at 0°C for 12 hours, and N-ethyl bromide, methylmorpholine, 1-ethyl bromide, and 3-methyl morpholine are added respectively. After imidazole, N, N, N-triethyl-N-propylammonium bromide, the state of the electrolyte is normal, which shows that N-ethyl bromide, methylmorpholine, ...

Embodiment 2

[0020] Take 4 parts of 30mL anode electrolyte, the concentration of anode electrolyte is 2MZnBr 2 +3MKCl+0.4MMEP. Add 1.38mL of bromine to each of them, and then add 0.2moL / L of different additives to three of them. Put it into a constant temperature box and store it at -10°C for 12 hours, and observe the state of the positive electrolyte. The effect of different additives on the low-temperature stability of the positive electrolyte of zinc-bromine flow battery was investigated.

[0021] The experimental results are shown in Table 2. As can be seen from Table 2, when no stabilizer was added, the positive electrode electrolyte was placed at -10°C for 12 hours to precipitate, and N-ethyl bromide, methylmorpholine, 1-ethyl bromide, 3 -Methylimidazole, N, N, N-triethyl-N-propylammonium bromide, the state of the positive electrode electrolyte is normal, which shows that N-ethyl bromide, methylmorpholine, 1-ethyl bromide , 3-methylimidazole, N, N, N-triethyl-N-propylammonium bro...

Embodiment 3

[0025] Take 4 parts of 30mL anode electrolyte, the concentration of anode electrolyte is 2MZnBr 2 +3MKCl+0.4MMEP. Add 1.38mL bromine to the anode electrolyte respectively, and then add 0.2moL / L different additives to three of them respectively. Store in a constant temperature box at -30°C for 12 hours, and observe the state of the electrolyte. The effect of different additives on the low-temperature stability of the positive electrolyte of zinc-bromine flow battery was investigated.

[0026] The experimental results are shown in Table 3. As can be seen from Table 3, when no stabilizer was added, the positive electrode electrolyte was placed at minus 30°C for 12 hours to precipitate, and N-ethyl bromide, methylmorpholine, 1-ethyl bromide, 3- Methylimidazole, N, N, N-triethyl-N-propylammonium bromide, the state of the positive electrode electrolyte is normal, which shows that N-ethyl bromide, methylmorpholine, 1-ethyl bromide, 3-Methylimidazole, N, N, N-triethyl-N-propylammo...

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Abstract

The invention relates to the application of a zinc-bromine flow battery cathode electrolyte in the battery. A quaternary ammonium salt additive is added to the zinc-bromine flow battery cathode electrolyte. The quaternary ammonium salt is N-ethyl bromide, methyl bromide One or more of morpholine, 1-ethyl bromide, 3-methylimidazole, N,N,N-triethyl-N-propylammonium bromide. The quaternary ammonium salt used in the present invention is used as a stabilizer of the electrolyte to effectively improve the stability of the electrolyte at low temperatures and realize stable operation of the battery at low temperatures. The preparation process of the electrolyte in the invention is simple, energy-saving, environment-friendly, and low in cost, and ensures the stable operation of the battery under low-temperature operating conditions.

Description

technical field [0001] The invention relates to the application of an electrolyte for a zinc-bromine flow battery. Background technique [0002] With the depletion of fossil energy, the development and utilization of renewable energy such as wind energy and solar energy has become the focus of attention of all countries. Due to the discontinuity and instability of wind energy and solar energy affected by weather and other factors, this will cause an impact on the grid during the grid connection process of renewable energy power generation, affecting the quality of power supply and the stability of the grid. Energy storage technology can solve this problem and ensure the efficient and stable operation of renewable energy power generation grid connection. Energy storage technologies are mainly divided into two categories: physical energy storage and chemical energy storage. Among them, chemical energy storage represented by all-vanadium redox flow battery and zinc-bromine re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 许鹏程李先锋张华民赖勤志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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