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Aqueous positive electrode polymer, preparation method thereof and small molecule flow battery system

A technology for flow batteries and polymers, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of restricting the large-scale application of flow batteries, cross-contamination of porous membranes, and large pore size of porous membranes, and achieve suppression of concentration differences. Polarization phenomenon, meet the needs of large-scale energy storage, the effect of fast charge and discharge rate

Active Publication Date: 2022-05-13
CHINASALT JINTAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most commercial flow batteries use highly toxic and expensive metals as electrode materials, which limits the large-scale application of flow batteries.
For the existing small molecule flow battery system, the porous membrane has a large pore size, and the use of porous membranes between active materials is prone to cross-contamination, while the cost of using other separators is high

Method used

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  • Aqueous positive electrode polymer, preparation method thereof and small molecule flow battery system
  • Aqueous positive electrode polymer, preparation method thereof and small molecule flow battery system
  • Aqueous positive electrode polymer, preparation method thereof and small molecule flow battery system

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preparation example Construction

[0049] The present invention also provides a method for preparing the above-mentioned water-based positive electrode polymer, comprising the following steps: Ester (TEMPMA), monomer 3-sulfonic acid propyl methacrylate potassium salt (SMPS) and monomer 2-methyl-2-propene-1-sulfonic acid sodium (SMAS) as raw materials, adding initiator, through free The method for preparing the water-based positive electrode polymer by base polymerization, the chemical reaction formula is as shown in formula (1):

[0050]

[0051] Specifically, the method for preparing the water-based positive electrode polymer includes the following steps: S11. In a container, sequentially add TEMPMA, SMPS, SMAS and dilute hydrochloric acid. After all the solids are dissolved, the initiator is added, and the 2 Stir and heat to remove oxygen in the environment, react for 18-24h; after the reaction, cool to room temperature; add NaOH dropwise to adjust to alkalinity, and then use a dialysis bag with a molecul...

Embodiment 1

[0081] Preparation of an Aqueous Positive Electrode Polymer by Free Radical Polymerization

[0082] In a 250 mL flask with a branch tube, TEMPMA (5.633 g 25 mmol), SMPS (7.512 g 30.5 mmol), SMAS (1.58 g 10 mmol) and 100 mL 0.75 M dilute hydrochloric acid were added sequentially. After all the solids were dissolved, the initiator 4,4'-azobis(4-cyanovaleric acid) (ABCVA, 0.84 g) was added to obtain a suspension. Pass N 2 After 30min, heat to 80°C. The solution turned from cloudy to clear. Reaction 24h. After the reaction, cool to room temperature. NaOH (20wt%) was added dropwise until the pH was around 8. Carry out dialysis with a dialysis bag with a molecular weight cut-off of 1000, and freeze-dry the solution after the dialysis to obtain a white flocculent polymer;

[0083] Oxidation: Dissolve the polymer in 30 mL deionized water, add Na 2 WO 4 (0.6g), heated to 50°C, added dropwise H within 20h 2 o 2 (30wt%) 22mL, NaOH was added dropwise throughout the process to m...

Embodiment 2

[0085] In a 250 mL flask with a branch tube, TEMPMA (4.50 g 20 mmol), SMPS (4.92 g 20 mmol), SMAS (1.58 g 10 mmol) and 10 mL of 0.75 M dilute hydrochloric acid were sequentially added. After all the solids were dissolved, the initiator 4,4'-azobis(4-cyanovaleric acid) (ABCVA, 0.84 g) was added. Pass N 2 After 30min, heat to 65°C. The solution turned from cloudy to clear. Reaction 24h. After the reaction, cool to room temperature. NaOH (20wt%) was added dropwise until the pH was around 8. Carry out dialysis with a dialysis bag with a molecular weight cut-off of 1000, and freeze-dry the solution after the dialysis to obtain a white flocculent polymer;

[0086] Oxidation: Dissolve the polymer in 50 mL deionized water, add Na 2 WO 4 (0.6g), stirring at room temperature, adding H dropwise within 20h 2 o 2 (30wt%) 22mL, NaOH was added dropwise throughout the process to maintain the pH at 8-9. Reaction at room temperature for 24h. A dialysis bag with a molecular weight cut...

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Abstract

The invention discloses a water-based positive electrode polymer, a preparation method thereof and a small molecule flow battery system, the water-based positive electrode polymer is synthesized by free radical polymerization of 2-methyl-2-acrylic acid-2, 2, 6, 6-tetramethyl-4-piperidine methyl ester (TEMPMA), 3-sulfonic acid propyl potassium methacrylate (SMPS) and 2-methyl-2-propylene-1-sodium sulfonate (SMAS), and the water-based positive electrode polymer is obtained by polymerization of the free radical polymerization of 2-methyl-2-acrylic acid-2, 2, 6, 6-tetramethyl-4-piperidine methyl ester (TEMPMA), 3-sulfonic acid propyl potassium methacrylate (SMPS) and 2-methyl-2-propylene-1-sodium sulfonate (SMAS). The micromolecule flow battery system comprises the aqueous positive electrode polymer and 1, 1-dimethyl-4, 4-dipyridyl dichloride. The polymer is used as an electrode material, on one hand, the increase of molecular weight can effectively reduce cross contamination among active substances, and decrease of battery capacity is reduced; and on the other hand, the porous membrane with lower cost can be directly used, so that the use cost is reduced. By adopting the polymer electrolyte with high concentration and low viscosity, the concentration polarization phenomenon can be inhibited, the stability of the battery is improved, the flow battery with the advantages that the active material is easy to prepare, the capacity is high, the safety performance is high, the charge-discharge performance is stable and the like is obtained, and the large-scale energy storage requirement is met.

Description

technical field [0001] The invention belongs to the field of flow batteries, and in particular relates to a water-based cathode polymer, a preparation method thereof, and a small molecule flow battery system. Background technique [0002] Since the Industrial Revolution, the high-carbon growth model based on non-renewable energy such as fossils is increasingly changing the atmospheric environment on which we live. The development and utilization of renewable energy can effectively deal with energy crisis and environmental problems. Renewable energy represented by wind power and photovoltaics has the characteristics of volatility and intermittency, and large-scale grid connection brings stability and reliability challenges to the power system. Supporting the application of energy storage technology in renewable energy power generation to achieve peak shaving and valley filling is an effective way to solve the problem of renewable energy grid integration. Flow batteries have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/38C08F220/34C08F228/02H01M8/18
CPCC08F220/382H01M8/188C08F220/34C08F228/02Y02E60/50
Inventor 杜滨阳付欢聂晶晶徐俊辉王慧陈留平张成建
Owner CHINASALT JINTAN
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