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A kind of preparation method of asymmetric speek/pp/fcb composite diaphragm for battery

An asymmetric, composite membrane technology, used in fuel cells, battery pack components, circuits, etc., can solve the problems of low proton conductivity, poor vanadium resistance, and high price of proton exchange membranes, and reduce self-discharge. Phenomenon, low raw material cost, low price effect

Active Publication Date: 2016-10-12
刘奇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, break through the shackles of traditional ion exchange membranes, provide a method for preparing a novel asymmetric SPEEK / PP / FCB composite diaphragm suitable for vanadium batteries, and solve the problems existing in the prior art Proton exchange membranes have problems such as low proton conductivity, poor stability, poor vanadium resistance, complicated process, and high price.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation of SPEEK solution: add 16.0 g of polyether ether ketone that has been vacuum dried at 80°C for 16 hours into 200ml of concentrated sulfuric acid with a concentration of 95-98wt%, and perform sulfonation reaction in a water bath at 30-70°C for 18 hours The product is added to the ice-water bath with a separatory funnel at a speed of 10-25ml / min and stirred vigorously. The product is filtered under reduced pressure and washed repeatedly until it is neutral; the product is dried at room temperature for 12-24 hours, and then dried in vacuum at 60°C for 10 Hours to obtain sulfonated polyether ether ketone (SPEEK). The SPEEK obtained is dissolved in DMSO at a mass volume of 1 / 5-1 / 100g / ml to prepare a SPEEK solution.

[0034] 2. Preparation of functionalized carbon material: 1.5g of carbon material, here XC-72 is used, vacuum-dried at 50°C for 5 hours, and then added to a flask containing 200ml of deionized water, ultrasonicated for 30min, and then stirred for 2h; ...

Embodiment 2

[0044] The difference from Example 1 is:

[0045] 1. Take 10 ml of the prepared SPEEK solution, and use the remaining steps in Example 1 to prepare a SPEEK composite diaphragm.

[0046] 2. The FCB diaphragm was compounded using the same steps after Example 1 to prepare an asymmetric PSFA / PP / SPEEK compound diaphragm.

[0047] In this embodiment, the thickness of the obtained SPEEK / PP / FCB composite diaphragm is 170 μm, and the composite diaphragm uses the PP diaphragm as the reinforced membrane, and the SPEEK diaphragm and the FCB layer are respectively composited. The thickness of the SPEEK is 10 to 90 μm, and the thickness of the SPEEK diaphragm is 15 to 80 microns. The interfaces in the composite diaphragm are in good contact, and there is no separation of the layers. The FCB layer has a uniform and dense texture.

[0048] The relevant performance data of this embodiment is as follows:

[0049] The surface resistance of the diaphragm in the all-vanadium redox flow battery measured a...

Embodiment 3

[0051] The difference from Example 1 is:

[0052] 1. Take 30 ml of the prepared SPEEK solution, and use the remaining steps in Example 1 to prepare a SPEEK composite diaphragm.

[0053] 2. The FCB diaphragm was compounded using the same steps after Example 1 to prepare an asymmetric SPEEK / PP / FCB compound diaphragm.

[0054] In this embodiment, the thickness of the obtained SPEEK / PP / FCB composite membrane is 300 μm, and the composite membrane uses the PP membrane as the reinforced membrane to compound the SPEEK membrane and FCB layer respectively. The thickness of SPEEK is 50-220 μm, and the thickness of SPEEK membrane is 15 to 80 microns. The interfaces in the composite diaphragm are in good contact, and there is no separation of the layers. The FCB layer has a uniform and dense texture.

[0055] The relevant performance data of this embodiment is as follows:

[0056] The surface resistance of the diaphragm in the all-vanadium redox flow battery measured at room temperature is 1.41Ω / ...

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Abstract

The invention relates to the field of membranes for all-vanadium redox flow batteries, in particular to a method for preparing an asymmetric SPEEK / PP / FCB composite membrane suitable for all-vanadium redox flow batteries, which solves the problems existing in the prior art Proton exchange membranes have problems such as poor stability, poor proton conductivity, poor vanadium resistance, and high price. The invention uses low-cost polyether ether copper (PEEK) as a raw material to prepare sulfonated polyether ether copper (SPEEK) through a sulfonation reaction; utilizes carbon materials to prepare functionalized carbon tubes (FCB), and the polypropylene nickel-hydrogen battery The polypropylene (PP) diaphragm was used as the reinforced film, and the SPEEK / PP / FCB composite diaphragm was prepared by film-forming methods such as step-by-step casting, slurry coating, and dipping. The invention breaks through the traditional proton exchange membrane concept, and the prepared composite diaphragm has the advantages of good proton conductivity, vanadium resistance, mechanical properties, chemical stability and excellent VRB battery performance, and is a commercial diaphragm for all-vanadium redox flow battery. opened up new avenues.

Description

Technical field [0001] The invention relates to the field of diaphragms for all-vanadium redox flow batteries (VRFB), in particular to a method for preparing an asymmetric SPEEK / PP / FCB composite diaphragm for batteries. Background technique [0002] Vanadium batteries are the most feasible battery technology for large-scale energy storage used in new clean energy (wind energy, solar power generation, etc.). The diaphragm material is one of the key materials that restrict the commercial development of vanadium batteries. A good diaphragm material should have good proton conductivity, mechanical properties, chemical stability, low vanadium ion permeability, etc. At this stage, there are basically no diaphragms that meet this condition. [0003] At this stage, the main diaphragm material used in the domestic and international demonstration projects is the Nafion series membrane of DuPont, but Nafion has poor vanadium resistance, serious battery self-discharge, and high price, which re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCH01M8/0221H01M8/0228H01M8/188Y02E60/50
Inventor 贾传坤刘奇贺浩韦铭泽刘亚栋
Owner 刘奇
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