Composite graphene ion exchange membrane for flow battery and preparation method thereof

An ion-exchange membrane and graphene composite technology, which is applied in the field of graphene composite ion-exchange membranes for flow batteries and their preparation, can solve problems such as poor ion selectivity or poor stability, and achieve low cost, stable battery performance, and improved stability. sexual effect

Active Publication Date: 2013-07-24
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to break through the problem of poor ion selectivity or stability in the existing ion exchange membranes for flow batteries, and to propose a flow battery with high ion selectivity and high stability at the same time. Graphene composite ion exchange membrane

Method used

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  • Composite graphene ion exchange membrane for flow battery and preparation method thereof
  • Composite graphene ion exchange membrane for flow battery and preparation method thereof
  • Composite graphene ion exchange membrane for flow battery and preparation method thereof

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preparation example Construction

[0035] The preparation method of the above-mentioned graphene composite ion exchange membrane, the method adopts the following steps and process conditions to prepare:

[0036] (1) The above-mentioned sulfonated polymer is added to the organic solvent according to the mass percentage of 1~80 wt%, at 20~100 oUltrasonic dispersion and / or magnetic stirring at C for 0.5-48 hours to prepare a sulfonated polymer solution. The magnetic stirring method can also be replaced by other methods, as long as the polymer can be uniformly dispersed.

[0037] (2) The above-mentioned graphene and / or graphene derivatives are mixed in a mass-volume ratio of 0.001-5 mg mL -1 Added to the organic solvent, at 20~100 o Ultrasonic dispersion and / or magnetic stirring at C for 0.5 to 48 hours to prepare a graphene and / or graphene derivative dispersion.

[0038] (3) Mixing the sulfonated polymer solution obtained in step (1) with the graphene or graphene derivative dispersion obtained in step (2), at 20...

Embodiment 1

[0045] (1) The ion exchange capacity of 1.0 g is 2.10 mmol g -1 Sulfonated polyetheretherketone (SPEEK) was added to 10 mL of N,N-dimethylformamide solvent at 25 o C for ultrasonic dispersion and magnetic stirring for 12 hours to prepare a SPEEK solution.

[0046] (2) Dissolve 1.0 mg of graphene oxide in 5 mL of N,N-dimethylformamide solvent at 25 o C under ultrasonic dispersion, magnetic stirring for 12 hours to prepare a graphene oxide dispersion.

[0047] (3) Mix the SPEEK solution prepared in step (1) with the graphene oxide dispersion prepared in step (2), and o C for ultrasonic dispersion and magnetic stirring for 24 hours to prepare a mixed solution. The mass percentage of graphene oxide in the total solute is 0.1 wt%, and the mass percentage of the total solute in the mixed solution is 6.6 wt%.

[0048] (4) Remove bubbles and impurities from the mixed solution prepared in step (3), and form a film on a horizontal clean glass plate by casting method, successively at...

Embodiment 2

[0051] The preparation method of the sulfonated polyether ether ketone-graphene oxide composite ion-exchange membrane of this embodiment 2 is the same as that of embodiment 1, and the graphene oxide content in the prepared sulfonated polyetheretherketone-graphene oxide composite ion-exchange membrane is 0.5 mg, that is, the mass percentage of graphene oxide in the total solute is 0.05 wt%. The thickness of the composite ion exchange membrane is 52 μm. A single cell of an all-vanadium redox flow battery was assembled with this composite ion-exchange membrane, and other assembly conditions and test conditions were the same as in Example 1 (excluding cycle charge-discharge life test). The Coulombic efficiency of the single cell is 97.8%, the voltage efficiency is 85.8%, and the energy efficiency is 83.9%.

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Abstract

The invention discloses a composite graphene ion exchange membrane for a flow battery and a preparation method thereof. The composite graphene ion exchange membrane comprises a sulfonation polymer which serves as an ion exchange membrane matrix and graphene and / or graphene derivatives doped in the ion exchange membrane matrix. The preparation method is a method for preparing the composite graphene ion exchange membrane. Compared with the prior art, the graphene and / or graphene derivatives are introduced into the sulfonation polymer for modification, and the graphene with a two-dimensional lamellar structure and / or graphene derivatives can improve the stability of the composite ion exchange membrane through the interaction between the graphene and the polymer molecules, and can serve as an obstacle (barrier) of active substance penetration in the ion exchange membrane so as to improve the ion selectivity of the composite ion exchange membrane. The sulfonation polymer-composite graphene ion exchange membrane is applied to the flow battery, particularly an all vanadium redox flow battery, and high battery efficiency and stable battery performance can be obtained.

Description

technical field [0001] The invention relates to a flow battery, in particular to a graphene composite ion exchange membrane for a flow battery and a preparation method thereof. Background technique [0002] Large-scale, high-efficiency energy storage technology is of great significance to ensure the security of the power grid and promote the utilization of renewable energy (solar energy, wind energy, etc.). Among various physical or chemical energy storage technologies, flow batteries have attracted the most attention due to their outstanding features such as easy scale-up, long cycle life, environmental friendliness, safe operation, freedom of site selection, fast response, and deep discharge. , one of the fastest growing and most promising energy storage technologies, is expected to be widely used in large-scale power storage, power grid peak regulation, smart grid, distributed power supply, emergency power supply, etc. Among all kinds of flow batteries, vanadium redox fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M2/16C08J5/22C08K3/04
CPCY02E60/50
Inventor 席靖宇李钊华周海鹏武增华邱新平
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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