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A preparation method for a SPEEK separator applied to a zinc iron flow battery

A liquid flow battery and diaphragm technology, which is applied in the field of preparation of sulfonated polyetheretherketone diaphragm, can solve the problems of high cost and ion permeation price, and achieve the effects of low internal resistance, high ion selectivity, and reduced voltage drop

Inactive Publication Date: 2019-04-05
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

[0004] In order to overcome the deficiencies of the existing technology and break through the shackles of traditional ion exchange membranes, the purpose of the present invention is to provide a preparation method for SPEEK diaphragms used in zinc-iron redox flow batteries, which solves the serious ion permeation and low cost of existing commercial diaphragms. Expensive and other issues

Method used

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  • A preparation method for a SPEEK separator applied to a zinc iron flow battery
  • A preparation method for a SPEEK separator applied to a zinc iron flow battery
  • A preparation method for a SPEEK separator applied to a zinc iron flow battery

Examples

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Effect test

Embodiment 1

[0031] In this example, the preparation method of the SPEEK diaphragm applied to the zinc-iron redox flow battery is as follows:

[0032] 1. Preparation of SPEEK: The mass volume ratio of PEEK and 98wt% concentrated sulfuric acid for sulfonation reaction is 7 / 100 (g / mL). React at 45°C and 300r / min stirring speed for 3h. After the reaction, the reaction product was washed with deionized water until neutral, and dried in an oven for 24 hours to obtain a dry SPEEK solid powder with a sulfonation degree of 66.7%.

[0033] 2. Preparation of SPEEK solution: Take 2.2g of dry SPEEK and add it to 50mL of N,N-dimethylformamide solution, and heat it at 100℃ for 5h to prepare SPEEK solution;

[0034] 3. The preparation method of SPEEK diaphragm, comprises the following steps:

[0035] (1) Stir the solution obtained in step (2) for 30 min at a stirring speed of 600 r / min, and ultrasonically treat it for 30 min to obtain a uniformly dispersed SPEEK solution.

[0036] (2) Add the solution...

Embodiment 2

[0043] The difference from Example 1 is:

[0044] Weigh 1.6 g of dried SPEEK solid and add it to 50 mL of N,N-dimethylformamide solution, and heat it at 100°C for 5 h with stirring to prepare a SPEEK solution. In this example, the thickness of the obtained SPEEK diaphragm is 70 μm, the texture of the diaphragm is uniform and dense, there is no phenomenon of solid dissolution, and it has good flexibility and mechanical properties.

[0045] The relevant performance data of the present embodiment are as follows:

[0046] The battery test using the separator at room temperature shows that the performance of the separator vanadium battery prepared at this ratio is good, but the capacity retention is worse than that of the separator prepared in Example 1, which is not conducive to the long-term cycle of ZFB. Compared with the preparation of the separator in Example 1, it is not conducive to the commercial application of vanadium batteries.

[0047] Such as image 3 It can be seen...

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Abstract

The invention relates to the field of separators for zinc iron redox flow batteries (ZFB), in particular to a preparation method for a zinc iron flow battery SPEEK separator, which solves the problemsof serious ion permeation and high price of ion exchange membranes existing in the existing commercial separators. The low-cost polyetheretherketone (PEEK) is used as the raw material; the SPEEK of asuitable sulfonation degree is used as the raw material for synthesizing the separator; and the SPEEK separator is prepared by membrane formation methods such as step dispersion and solution castingThe separator prepared by the invention has the advantages of good ion selectivity, excellent ionic conductivity, good mechanical properties and chemical stability, and excellent single ZFB battery performance, and is widely used in the field of zinc iron and other flow batteries.

Description

Technical field: [0001] The invention relates to the field of diaphragms used in redox flow batteries (abbreviated as ZFB), in particular to a method for preparing a sulfonated polyether ether ketone (SPEEK) diaphragm applied to large-scale zinc-iron flow battery energy storage. Background technique: [0002] With the increasing depletion of non-renewable energy such as fossil fuels and the environmental pollution it brings, the utilization of clean energy has attracted widespread attention. However, because natural resources such as wind energy and solar energy are affected by the environment, they are unstable and discontinuous, which limits the use of renewable energy. Liquid flow battery technology is the most feasible electrochemical energy storage technology for large-scale energy storage supporting new clean energy, and has great advantages in large-scale energy storage. At present, the main problem restricting the commercialization of flow batteries is the high cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0239H01M8/18
CPCH01M8/0239H01M8/188Y02E60/50
Inventor 丁美常顺利叶家业吴春秦伟贾传坤
Owner 山东奥德储能科技有限公司
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