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Modification method of proton exchange membrane for all-vanadium redox flow battery

A technology of all-vanadium redox flow battery and proton exchange membrane, which is applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of poor vanadium resistance performance and affect the electrochemical performance of all-vanadium redox flow battery, etc., and achieve good combination , vanadium ion permeability decreased, the effect of improving the overall performance

Inactive Publication Date: 2017-05-31
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Among them, the proton exchange membrane is one of the most important components of the system. DuPont's product Nafion (perfluorinated ion exchange resin) membrane has excellent electrochemical performance and good chemical stability. Therefore, its It is currently the most widely used proton exchange membrane in the field of vanadium redox flow batteries. However, the vanadium resistance of Nafion proton exchange membrane is poor, and the poor performance of vanadium resistance will directly affect the improvement of the comprehensive performance of proton exchange membrane, so as to affect the performance of all vanadium liquid. Electrochemical performance of flow batteries

Method used

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  • Modification method of proton exchange membrane for all-vanadium redox flow battery
  • Modification method of proton exchange membrane for all-vanadium redox flow battery
  • Modification method of proton exchange membrane for all-vanadium redox flow battery

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Embodiment 1

[0041] like figure 1 As shown, embodiment 1 provides a kind of modification method for the proton exchange membrane of all-vanadium redox flow battery, and it comprises the following steps:

[0042] S1. Preparation of submicron ZSM-5 zeolite: first weigh 2.185g of deionized water, add it to 5.463g (the mass ratio of deionized water to tetrapropylammonium hydroxide is 1:2.5) and the concentration is 1.0 mol / L tetrapropylammonium hydroxide (TPAOH) aqueous solution, stirring to form a uniform solution; then weigh 1.093g of silicic acid (that is, the mass ratio of silicic acid to TPAOH is 1:5), and add silicic acid to the above uniform solution; then add 0.044g of sodium metaaluminate (that is, the mass ratio of sodium metaaluminate to silicic acid is 1:25) powder into the above solution, and stir evenly to obtain a milky white solution; then the obtained milky white The solution was stirred for 24 hours to obtain a homogeneous solution, which was transferred to a 100mL Teflon-li...

Embodiment 2

[0051] The difference between the modification method of a proton exchange membrane used in an all-vanadium redox flow battery provided in Example 2 and the modification method described in Example 1 is that the quality of TPAOH in Step S1 of Example 1 is 5.463 g is replaced by: the mass of TPAOH is 6.555g, that is to say, the mass ratio of deionized water to TPAOH is 1:3, and at the same time, according to the mass ratio of silicic acid to TPAOH is 1:5, sodium metaaluminate and silicic acid The mass ratio is 1:25, add 1.311g silicic acid and 0.052g sodium metaaluminate, other content is all the same as embodiment 1, repeats no more here. The composite proton exchange membrane prepared in Example 2 is numbered A2.

Embodiment 3

[0053] The difference between the modification method of a proton exchange membrane used in an all-vanadium redox flow battery provided in Example 3 and the modification method described in Example 1 is that the quality of TPAOH in step S1 of Example 1 is 5.463 g is replaced by: the mass of TPAOH is 7.648g, that is to say, the mass ratio of deionized water to TPAOH is 1:3.5, and at the same time, according to the mass ratio of silicic acid to TPAOH is 1:5, sodium metaaluminate and silicic acid The mass ratio is 1:25, add 1.530g silicic acid and 0.061g sodium metaaluminate, other content is all the same as embodiment 1, repeats no more here. The composite proton exchange membrane prepared in Example 3 is numbered A3.

[0054] Comparing the properties of the composite proton exchange membranes prepared in Examples 1-3, it was found that the performance of the composite proton exchange membrane prepared in Example 2 was the best. In other words, the performance of the composite ...

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Abstract

The invention relates to a modification method of a proton exchange membrane for an all-vanadium redox flow battery, relating to the technical field of batteries. The modification method comprises the following steps: S1, preparation of submicron order ZSM-5 type zeolite: evenly mixing deionized water, tetrapropylammonium hydroxide, silicic acid and sodium metaaluminate, performing a hydrothermal synthesis method to the mixed solution, and then performing centrifugal cleaning and drying, so as to prepare the submicron order ZSM-5 type zeolite; and S2, preparation of a composite proton exchange membrane: preparing the composite proton exchange membrane from the submicron order ZSM-5 type zeolite obtained in the step 1 and a proton exchange membrane solution. The water-absorbing property, ion exchange capacity, proton conductivity and vanadium ion permeability of the composite proton exchange membrane prepared by adopting the modification method are superior to those of an unmodified proton exchange membrane. Compared with the unmodified proton exchange membrane, the vanadium ion permeability of the composite proton exchange membrane is reduced by 11%, and the proton conductivity is improved by 20%.

Description

technical field [0001] The invention relates to a method for modifying a proton exchange membrane used in an all-vanadium redox flow battery, and relates to the technical field of batteries. Background technique [0002] All-vanadium redox flow battery is an electrochemical energy storage system for electric energy storage, which has the advantages of good electrochemical performance, reasonable cost, convenient operation, good safety, and low pollution. The vanadium redox flow battery has a simple structure, mainly composed of positive and negative electrodes, proton exchange membrane, electrolyte storage system and pump system. [0003] Among them, the proton exchange membrane is one of the most important components of the system. DuPont's product Nafion (perfluorinated ion exchange resin) membrane has excellent electrochemical properties and good chemical stability. Therefore, its It is currently the most widely used proton exchange membrane in the field of vanadium redo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0243H01M8/18
CPCH01M8/0243H01M8/188Y02E60/50
Inventor 武俊伟刘彦辰安德鲁·贝克崔传敏崔彦辉
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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