A kind of daramic composite ion-conducting membrane and its preparation and application

A composite ion-conducting membrane technology, applied in Daramic composite ion-conducting membrane and its preparation and application fields, can solve the problems of low Coulombic efficiency and capacity retention, poor cycle stability, poor pore size uniformity, etc., and achieve good ion conductivity and stability Good performance and low cost

Active Publication Date: 2022-05-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Daramic membrane itself has good ion conductivity, but when the Daramic membrane is applied to a bromine-based flow battery, its selectivity is low, the pore size uniformity is poor, the Coulombic efficiency and capacity retention are low, resulting in poor cycle stability and cannot meet Directly used in bromine-based flow batteries

Method used

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  • A kind of daramic composite ion-conducting membrane and its preparation and application
  • A kind of daramic composite ion-conducting membrane and its preparation and application
  • A kind of daramic composite ion-conducting membrane and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First dissolve polyvinylidene fluoride (PVDF) in the organic solvent DMAc, and stir thoroughly at 25°C for 48 hours to form a uniform blend solution; the mass concentration of PVDF is 10%; then the prepared PVDF solution is evenly coated On the Daramic membrane substrate, immersed in non-solvent (water) at 50°C for 2h, the prepared Daramic membrane substrate (thickness: 200 μm, porosity: 60%, pore size distribution range: 0.1-100nm, the following examples and comparative examples The Daramic membranes used in this paper all adopt this parameter) One side is coated with a Daramic composite ion-conducting membrane with a porous PVDF coating, and the thickness of the porous PVDF coating is 5 μm.

[0032] The performance of the Daramic composite ion-conducting membrane is tested and compared with the performance of the Daramic membrane substrate. The present invention takes a zinc-bromine flow battery as an example. The surface resistance of the prepared Daramic composite i...

Embodiment 2

[0035] The polymer solution was prepared according to the method described in Example 1 above to prepare a Daramic composite ion-conducting membrane, except that the mass concentration of PVDF was 20% (Table 1).

[0036] The performance of the prepared Daramic composite ion-conducting membrane was tested, and compared with the performance of the Daramic composite ion-conducting membrane prepared in Example 1 and the performance of the Daramic membrane substrate. The present invention takes a zinc-bromine flow battery as an example. The surface resistance of the prepared Daramic composite ion-conducting membrane is as shown in table 1, and it is higher than the surface resistance of the prepared Daramic composite ion-conducting membrane and the Daramic membrane substrate of embodiment 1, shows that the raising of PVDF mass concentration makes the prepared Daramic The impedance of the composite ion-conducting membrane increased and the ion conductivity decreased (Table 6). This ...

Embodiment 3

[0039] The polymer solution was prepared according to the method described in Example 1 above to prepare a Daramic composite ion-conducting membrane, except that the thickness of the porous PVDF coating was 40 μm (Table 1).

[0040] The performance of the prepared Daramic composite ion-conducting membrane was tested, and compared with the performance of the Daramic composite ion-conducting membrane prepared in Example 1 and the performance of the Daramic membrane substrate. The present invention takes a zinc-bromine flow battery as an example. The surface resistance of the prepared Daramic composite ion-conducting membrane is as shown in Table 1, which is higher than the surface resistance of the prepared Daramic composite ion-conducting membrane and the Daramic membrane substrate in Example 1, showing that the improvement of the thickness of the porous PVDF coating makes the prepared The impedance of the Daramic composite ion-conducting membrane increases because the greater t...

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Abstract

The invention discloses a Daramic composite ion-conducting membrane applied in a liquid flow battery, and is specially designed to include the application of this type of membrane in a zinc-bromine flow battery. This type of membrane is prepared by coating a porous polymer coating on the surface of a commercial Daramic membrane. The Daramic composite ion-conducting membrane of the present invention has high stability and low cost; the ion selectivity and ion conductivity of the Daramic composite ion-conducting membrane can be regulated and controlled by adjusting the pore structure and thickness of the porous polymer coating; the prepared Daramic composite ion-conducting membrane The membrane has the advantages of high mechanical strength, good chemical stability, high efficiency, and low cost; in addition, the preparation process of the Daramic composite ion-conducting membrane is simple and controllable, and is suitable for large-scale production; A range of options for conductive membrane materials.

Description

technical field [0001] The invention provides the preparation and application of a Daramic composite ion-conducting membrane, and particularly relates to its application in the field of liquid flow batteries. Background technique [0002] In recent years, the use of renewable and clean energy has become more and more popular. However, the power generation of renewable energy such as wind energy and solar energy is affected by seasons, weather and geographical conditions, and has obvious discontinuity and instability. The generated electric power fluctuates greatly, and the adjustability is poor. In turn, it may have a greater impact on the power grid. Therefore, with the rapid rise of renewable energy such as wind energy and solar energy and the smart grid industry, energy storage technology has become the focus of much attention. Large-scale energy storage technology is considered as a strategic technology to support the popularization of renewable energy, and has receive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0243H01M8/18
CPCH01M8/188H01M8/0243Y02E60/50
Inventor 鲁文静李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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