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Application of polymer porous separation membrane in liquid flow energy storage battery

A liquid flow energy storage battery and porous separation membrane technology, which is applied to fuel cell parts, fuel cells, battery pack parts, etc., can solve the problem that polyvinylidene fluoride membranes cannot be used as ion exchange membranes and reduce polymer performance and other problems, to avoid the reduction of polymer oxidation stability, to achieve the effect of controllability and excellent mechanical stability

Inactive Publication Date: 2014-03-26
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 problem is that the dense polyvinylidene fluoride membrane cannot be used as an ion exchange membrane, and the corresponding performance of the polymer will be reduced by modification such as grafting or sulfonation

Method used

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  • Application of polymer porous separation membrane in liquid flow energy storage battery
  • Application of polymer porous separation membrane in liquid flow energy storage battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1.8 grams of polyvinylidene fluoride with a molecular weight of 50,000 was dissolved in 10ml of DMAC, stirred for 12 hours, and the resulting polymer solution was spread on a glass plate, then quickly immersed in 5L of water, solidified, and formed a porous separation membrane. The structure of the membrane is a typical asymmetric porous membrane, which consists of a dense skin layer and a macroporous support layer. The pore diameter of the membrane skin is about 50nm, the porosity is 70%, and the thickness is 70 microns.

[0033] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 80mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The assembled flow battery has a current efficien...

Embodiment 2

[0035] 2.1 g of polyvinylidene fluoride was dissolved in 10 ml of DMAC, stirred for 12 hours, and the formed polymer solution was spread on a glass plate, and then quickly immersed in 5 L of water to solidify to form a porous separation membrane. The pore size of the membrane skin is about 40nm, the porosity is 75%, and the thickness is 70 microns.

[0036] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 80mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The assembled flow battery has a current efficiency of 92.1%, a voltage efficiency of 86.2%, and an energy efficiency of 79.4%.

Embodiment 3

[0038] Dissolve 2.3 g of polyvinylidene fluoride in 10 ml of DMAC, stir for 12 hours, spread the resulting polymer solution on a glass plate, then quickly immerse in 5 L of water, solidify, and form a porous separation membrane. The pore size of the membrane skin is about 30nm, the porosity is 80%, and the thickness is 70 microns.

[0039] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 80mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The assembled flow battery has a current efficiency of 96.8%, a voltage efficiency of 74.5%, and an energy efficiency of 72.1%. It can be seen that in Examples 1-3, as the membrane pore size decreases, the coulombic efficiency of the battery increases...

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Abstract

The invention relates to application of a polymer porous separation membrane in a liquid flow energy storage battery. The porous separation membrane is a polyvinylidene fluoride porous separation membrane with controllable pore diameter, wherein the molecular weight of polyvinylidene fluoride is between 10,000 and 100,000, the pore diameter of the porous membrane is distributed in the range of 0.1-500nm, the porosity is 30-90 percent, and the membrane thickness is 30-1,000um. The membrane materials are simple in preparation method, good in chemical stability and controllable in pore diameter, and large-scale production can be easily realized; The prepared membrane material can easily realize separation of ions with different valence states, and keep the ion selectivity of membranes. Furthermore, the membrane materials can transfer ions without introducing any ion exchange groups, so that the selection range of liquid flow energy storage battery membrane materials can be expanded.

Description

technical field [0001] The invention relates to the field of separation membranes for liquid flow energy storage batteries, in particular to the application of a polymer porous separation membrane in liquid flow energy storage batteries. Background technique [0002] All-vanadium redox flow battery (VFB) has the advantages of independent capacity and power, high energy conversion efficiency, high-current non-destructive deep discharge, long service life, easy operation and maintenance, etc., and can be widely used in energy storage equipment for renewable energy , emergency power system, power station energy storage and power system peak load shaving, load leveling, etc. [0003] Membrane is an important part of vanadium battery, it plays a role in blocking positive and negative electrolytes and providing proton transport channels. The proton conductivity, chemical stability and ion selectivity of the membrane directly affect the electrochemical performance and service life...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/18H01M2/16H01M8/18H01M8/0239H01M50/417H01M50/463
CPCY02E60/528H01M8/0239H01M8/18Y02E60/50
Inventor 张华民李先锋魏文平段寅琦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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