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Polytetrafluoroethylene interlayer protective ion exchange membrane, its preparation method and flow battery

An ion exchange membrane, polytetrafluoroethylene technology, applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve problems such as poor stability, and achieve the effects of stable battery performance, uniform pore size distribution, and simple preparation steps.

Active Publication Date: 2016-08-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor stability of ion exchange membranes with better ion selectivity for existing flow batteries, and to provide a polytetrafluoroethylene interlayer protective film that meets the requirements of high ion selectivity and high stability. Ion-exchange membrane, its preparation method and flow battery using the ion-exchange membrane

Method used

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  • Polytetrafluoroethylene interlayer protective ion exchange membrane, its preparation method and flow battery
  • Polytetrafluoroethylene interlayer protective ion exchange membrane, its preparation method and flow battery
  • Polytetrafluoroethylene interlayer protective ion exchange membrane, its preparation method and flow battery

Examples

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Effect test

Embodiment 1

[0035] (1) The ion exchange capacity of 1.5g is 1.80mmol g -1 , sulfonated polyetheretherketone (SPEEK) with a sulfonation time of 3 hours and a sulfonation degree of 0.61 was added to 10 mL of N,N-dimethylformamide solvent (DMF), fully ultrasonically dispersed at 25°C, and magnetically Stir for 24 hours to make a homogeneous solution of SPEEK.

[0036] (2) Remove bubbles and impurities from the homogeneous solution of SPEEK prepared in step (1), form a film on a horizontal clean glass plate by casting method, dry at 60°C for 12 hours, and vacuum dry at 100°C for 12 hours, and then in Membrane removal in deionized water can prepare sulfonated polyether ether ketone ion exchange membrane base membrane. In this example, the basement membrane thickness of the obtained ion exchange membrane is 70 μm.

[0037] (3) Cut the required polytetrafluoroethylene (PTFE) microporous membrane with a thickness of 30 μm and a pore size of 0.45 μm to the required size, and place a PTFE micropo...

Embodiment 2

[0041] The preparation method of the sulfonated polyether ether ketone-polytetrafluoroethylene interlayer membrane in Example 2 is the same as in Example 1, the thickness of the polytetrafluoroethylene (PTFE) film used is 60 μm, and the pore size is 0.45 μm, and P 60 (0.45)-S3-P 60 (0.45) interlayer film. This interlayer film was used to assemble a single cell of an all-vanadium redox flow battery, and other assembly conditions and test conditions were the same as in Example 1. The current efficiency of a single cell is 98.5%, the voltage efficiency is 85.3%, and the energy efficiency is 84.1% (such as figure 2 shown). In the cycle charge and discharge life experiment, the battery charge and discharge current density is 80mA cm -2 , the current efficiency is very stable and the battery charging capacity decays slowly. After 605 cycles, the charging capacity retention rate is 60% (such as image 3 shown).

Embodiment 3

[0043] The preparation method of the sulfonated polyether ether ketone-polytetrafluoroethylene interlayer membrane in Example 3 is the same as in Example 1, the thickness of the polytetrafluoroethylene (PTFE) film used is 15 μm, and the pore size is 0.45 μm, and P 15 (0.45)-S3-P 15 (0.45) interlayer film. This interlayer film was used to assemble a single cell of an all-vanadium redox flow battery, and other assembly conditions and test conditions were the same as in Example 1. The current efficiency of a single cell is 98.6%, the voltage efficiency is 85.4%, and the energy efficiency is 84.2% (such as figure 2 shown). In the cycle charge and discharge life experiment, the battery charge and discharge current density is 80mA cm -2 , the current efficiency is very stable and the battery charging capacity decays slowly. After 478 cycles, the charging capacity retention rate is 60% (such as image 3 shown).

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Abstract

The invention discloses a polyfluortetraethylene sandwich layer protective ion exchange membrane. The polyfluortetraethylene sandwich layer protective ion exchange membrane comprises a sulfonation polymer ion exchange membrane basic membrane, and also comprises a polyfluortetraethylene microporous membrane(s) which is / are used as a sandwich layer protective membrane and attached to one side or two sides of the basic membrane. The invention also discloses a preparation method of the polyfluortetraethylene sandwich layer protective ion exchange membrane and a liquid flow battery adopting the polyfluortetraethylene sandwich layer protective ion exchange membrane. By adopting the polyfluortetraethylene sandwich layer protective ion exchange membrane, the high ion selectivity and high stability requirements can be simultaneously met, the efficiency of the liquid flow battery is improved, the cycling life is prolonged and especially the all-vanadium redox flow battery can be remarkably improved.

Description

technical field [0001] The invention relates to a liquid flow battery, in particular to a polytetrafluoroethylene interlayer protective ion exchange membrane, a preparation method of the ion exchange membrane and a flow battery using the ion exchange membrane. Background technique [0002] Energy and the environment have always been the key factors for the survival and development of human society. In order to solve the current contradiction between energy consumption and environmental pollution and realize the sustainable development of the national economy, people began to develop and utilize renewable energy, such as solar energy, wind energy, tidal energy, etc. However, the power generation of these renewable energy sources is unstable and unstable. continuity. In order to achieve the stability and continuity of subsequent power generation, it is extremely important to develop efficient and excellent large-scale energy storage technologies. Flow battery (flow battery) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1041H01M8/1069B32B27/08B32B27/30H01M8/18H01M8/1023H01M8/103
CPCB32B27/30B32B27/32H01M4/8807H01M4/94Y02E60/50
Inventor 席靖宇代文静李钊华
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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