Porous membrane for flow battery and its preparation and application

A liquid flow battery and porous membrane technology, which is applied in the field of porous membrane and its preparation and application, can solve the problems of difficult balance between selectivity and proton conductivity, and achieve improved selectivity and proton conductivity, adjustable pore structure, and low cost. cheap effect

Active Publication Date: 2017-05-03
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

However, it is difficult to balance the selectivity and proton conductivity of porous membranes for hydrogen ions and vanadium ions, so it is of great significance to improve the selectivity and ion conductivity of porous membranes, and then realize their large-scale application.

Method used

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  • Porous membrane for flow battery and its preparation and application
  • Porous membrane for flow battery and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 8 grams of polyethersulfone and 4 grams of polyvinylpyrrolidone in 20 mL of DMAC, stir for 8 hours, spread the polymer solution on a glass plate, and then quickly put it into a constant temperature with a water vapor humidity of 100% and a temperature of 50 °C. In a constant humidity chamber, cure for 10 minutes to form a porous film with a film thickness of 130 μm. Soak the prepared membrane in 3M sulfuric acid solution of 1.5M pentavalent vanadium for 48 hours. From figure 1 It can be seen that a porous separation membrane with a hierarchical pore structure was obtained.

[0032] The all-vanadium redox flow battery is assembled by using the prepared porous composite membrane, wherein the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective area of ​​the membrane is 6cm -2 , the positive and negative electrolyte volumes are 30mL, and the vanadium ion concentration is 1.50mol L -1 , H 2 SO 4 The concentration is ...

Embodiment 2

[0034] Similar to Example 1, the porous composite membrane was prepared by replacing polyethersulfone with polyacrylonitrile. The assembled flow battery has a current efficiency of 89% and an energy efficiency of 76%.

Embodiment 3

[0036] Similar to Example 1, the polyvinylpyrrolidone was replaced by silicon oxide to prepare a porous composite membrane. The assembled flow battery has a current efficiency of 91% and an energy efficiency of 78.5%.

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Abstract

The invention relates to a porous membrane for a liquid flow battery and its preparation and application. The porous membrane is composed of one or more organic polymer resins and one or two organic or inorganic components degradable in electrolyte The above is prepared from raw materials; the content of degradable components is 5-40wt% of the mass of the organic polymer resin; and it is prepared under constant temperature and humidity conditions during the preparation process. This type of membrane has a multi-level porous structure, which can effectively realize the separation of ions in different valence states and maintain the ion permeation selectivity of the ion membrane of the membrane. This type of composite membrane has simple process, environmentally friendly process, controllable pore structure, low cost and easy mass production.

Description

technical field [0001] The invention relates to a porous membrane for a liquid flow battery, in particular to a porous membrane with a hierarchical pore structure and its preparation and application. Background technique [0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free site selection, deep discharge, safety and environmental protection, and low maintenance costs. It can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Vanadium flow battery (Vanadium flow battery, VFB) is considered to have good application prospects due to its advantages of high safety, good stability, high efficiency, long life (life > 15 years), and low cost. [0003] The battery sepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1046H01M8/1069H01M8/18H01M8/023H01M8/0239H01M8/0241
CPCH01M8/0293H01M8/188Y02E60/50Y02P70/50
Inventor 李先锋张华民段寅琦徐万兴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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