Preparation method for selecting SPEEK/GO/TiO2 composite ion selection membrane in nanometer insertion layer

A composite ion and selective membrane technology, which is applied in the direction of fuel cells, electrochemical generators, electrical components, etc., can solve the problems of high cost and vanadium ion penetration price, achieve low internal resistance, improve mechanical properties and chemical stability, and disperse good performance

Active Publication Date: 2019-10-18
山东奥德储能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the existing technology and break through the shackles of traditional proton exchange membranes, the purpose of the present invention is to provide a nano-intercalation-selective SPEEK / GO / TiO suitable for vanadium batteries. 2 A method for preparing a composite ion-selective membrane, which solves the problems of serious vanadium ion permeation and high price in existing commercial diaphragms

Method used

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  • Preparation method for selecting SPEEK/GO/TiO2 composite ion selection membrane in nanometer insertion layer
  • Preparation method for selecting SPEEK/GO/TiO2 composite ion selection membrane in nanometer insertion layer
  • Preparation method for selecting SPEEK/GO/TiO2 composite ion selection membrane in nanometer insertion layer

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 1. Preparation of SPEEK: The mass-volume ratio of the sulfonation reaction of PEEK powder (with a particle size of 15 μm) and 98 wt % concentrated sulfuric acid 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 at 50° C. for 24 hours to obtain dry SPEEK.

[0038] 2. Preparation of SPEEK solution: Add 3.0 g of dry SPEEK to 50 mL of N,N-dimethylformamide solution, and stir for 5 hours at 100°C to prepare SPEEK solution;

[0039] 3. Select SPEEK / GO / TiO in nano intercalation 2 The preparation method of composite ion selective membrane comprises the following steps:

[0040] (1) Add 300 mg of GO with an oxidation degree of 6% to the SPEEK solution obtained in step 2 to obtain a SPEEK / GO mixed solution with a mass fraction of 6.5%. Among them, the GO content of the SPEEK / GO mixed solution is 0.6wt%.

[0041] (2) Treat 3h of TiO with 300mg concentra...

Embodiment 2

[0049] The difference from Example 1 is:

[0050] In this example, 50 mg of GO with an oxidation degree of 6% was weighed and added to the SPEEK solution to obtain a SPEEK / GO mixed solution with a mass fraction of 6%, and the GO content of the SPEEK / GO mixed solution was 0.1 wt%. The rest of the steps in Example 1 are used to prepare the selected SPEEK / GO / TiO in the nano-intercalation 2 Composite ion selective membrane. Among them, SPEEK / GO / TiO 2 The mass fraction of the mixed solution is 6.6%, SPEEK / GO / TiO 2 Mixed solution of TiO 2 The content is 0.6wt%, SPEEK / GO / TiO 2 GO / TiO with Composite Ion Selective Membrane 2 The content is 10.4wt%.

[0051] In this example, SPEEK / GO / TiO was selected in the obtained nano-intercalation 2 The thickness of the composite ion selective membrane is 50 μm, the texture of the composite separator is uniform and dense, and there is no GO / TiO 2 Dissolution phenomenon, while having good flexibility and mechanical properties.

[0052] The r...

Embodiment 3

[0055] The difference from Example 1 is:

[0056] In this example, 600 mg of GO with an oxidation degree of 6% was weighed and added to the SPEEK solution to obtain a SPEEK / GO mixed solution with a mass fraction of 7.2%, and the GO content of the SPEEK / GO mixed solution was 1.2 wt%. The rest of the steps in Example 1 are used to prepare the selected SPEEK / GO / TiO in the nano-intercalation 2 Composite ion selective membrane. Among them, SPEEK / GO / TiO 2 The mass fraction of the mixed solution is 7.6%, SPEEK / GO / TiO 2 Mixed solution of TiO 2 The content is 0.6wt%, SPEEK / GO / TiO 2 GO / TiO with Composite Ion Selective Membrane 2 The content is 23 wt%.

[0057] In this example, SPEEK / GO / TiO was selected in the obtained nano-intercalation 2 The thickness of the composite ion selective membrane is 70 μm, and the texture of the composite separator is uniform, but the GO / TiO 2 There is agglomeration phenomenon, which is not suitable for application in vanadium batteries.

[0058] Th...

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Abstract

The invention relates to the field of a diaphragm for an all-vanadium oxygen-reduction redox flow battery, in particular to a preparation method for selecting a sulfonated polyetheretherketone / graphene oxide / titanium dioxide nanometer particle composite ion selection membrane in a nanometer insertion layer. By the preparation method, the problems of vanadium ion permeation seriousness, poor ion selectivity and high cost of a proton exchange membrane in an existing commercial diaphragm are solved. The low-cost sulfonated polyetheretherketone (SPEEK) is used as a base film, a graphene oxide / titanium dioxide nanometer particle (GO / TiO2) insertion layer composite material is used for controlling an ion selection conduction passage, and the SPEEK / GO / TiO2 composite ion selection membrane is prepared by a film formation method such as dispersion step by step and solution pouring. The composite ion selection membrane prepared by the invention has the advantages of favorable ion selection conductivity, excellent vanadium ion blocking performance, favorable mechanical property, chemical stability and excellent single VRB battery performance and the like and is widely applied to the field ofthe all-vanadium oxygen-reduction redox flow battery.

Description

Technical field: [0001] The invention relates to the field of diaphragms used in all-vanadium redox flow batteries (abbreviated as vanadium batteries or VRBs), in particular to a GO / TiO-based membrane suitable for all-vanadium redox flow batteries. 2 Select SPEEK / GO / TiO within the nanointercalation 2 Preparation method of composite ion selective membrane. Background technique: [0002] Vanadium battery is the most feasible electrochemical energy storage technology for large-scale energy storage supporting new clean energy (such as wind energy, solar power generation, etc.). At present, the main problem restricting the commercialization of vanadium batteries is the high cost. Among them, the high-cost diaphragm material is the main limiting factor of the cost of the vanadium battery system, so it is the key material that restricts the commercial development of the vanadium battery. A good separator material should have good proton conductivity, good stability, superior van...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1041H01M8/1067H01M8/1069H01M8/18
CPCH01M8/1041H01M8/1067H01M8/1069H01M8/188Y02E60/50
Inventor 丁美贾传坤叶家业吴春秦伟钟芳芳
Owner 山东奥德储能科技有限公司
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