Unlock instant, AI-driven research and patent intelligence for your innovation.

Modification method of diaphragms for all vanadium flow batteries

An all-vanadium redox flow battery and diaphragm technology, which is applied to fuel cell parts, battery pack parts, circuits, etc., can solve the problems of low physical and chemical stability, restrict the development of vanadium batteries, and high production costs, and achieve High physical and chemical stability, good electrical conductivity, and the effect of reducing the overall cost

Active Publication Date: 2014-07-16
SICHUAN DAZHOU IRON & STEEL GROUP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing separators have poor selective permeability, low physical and chemical stability, poor electrical conductivity, high production costs, complex processes, and relatively long membrane processing time. Therefore, it has always restricted the development of vanadium batteries. ,

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modification method of diaphragms for all vanadium flow batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for modifying the diaphragm for an all-vanadium redox flow battery provided in this embodiment comprises the following steps:

[0023] (1) Polymethyl methacrylate, polyvinylidene fluoride, polyvinyl alcohol, nano-SiO 2 Added according to the mass ratio of 30%, 30%, 10%, and 5%, respectively, and finally added the solvent dimethylamide with a total mass of 25% of the solute, and mixed the various substances uniformly by ultrasonic vibration for 3 hours.

[0024] (2) After vacuum degassing the homogeneous mixture for 4 hours, a diaphragm is formed on a mold, and the temperature of the mold is controlled at 30°C.

[0025] (3) Under the protection of nitrogen, the diaphragm is treated with water vapor at a temperature of 70°C for 0.5h, then washed twice with deionized water, and the polyvinyl alcohol (PVA) and dimethylamide (DMF) in the diaphragm are dissolved by water vapor. ), not only makes the diaphragm a microporous diaphragm, but also saves the dissolution...

Embodiment 2

[0030] The method for modifying the diaphragm for an all-vanadium redox flow battery provided in this embodiment comprises the following steps:

[0031] (1) Polymethyl methacrylate, polyvinylidene fluoride, polyvinyl alcohol, nano-SiO 2 They were added in mass ratios of 50%, 15%, 5%, and 2%, respectively, and finally dimethylamide, a solvent with a total mass of solute of 28%, was added, and various substances were mixed evenly by ultrasonic vibration for 5 hours.

[0032] (2) After vacuum degassing the homogeneous mixture for 6 hours, a diaphragm is made on a mold, and the temperature of the mold is controlled at 70°C.

[0033] (3) Under the protection of nitrogen, the diaphragm is treated with water vapor at a temperature of 90°C for 1 hour, then washed 5 times with deionized water, and the polyvinyl alcohol (PVA) and dimethylamide (DMF) in the diaphragm are dissolved by water vapor , not only makes the diaphragm a microporous diaphragm, but also saves the dissolution time....

Embodiment 3

[0038] The method for modifying the diaphragm for an all-vanadium redox flow battery provided in this embodiment comprises the following steps:

[0039] (1) Polymethyl methacrylate, polyvinylidene fluoride, polyvinyl alcohol, nano-SiO 2 40%, 40%, 5%, and 5% were added in mass ratios, and finally dimethylamide, a solvent with a total mass of solute of 10%, was added, and various substances were mixed evenly by ultrasonic vibration for 4 hours.

[0040] (2) After vacuum degassing the homogeneous mixture for 5 hours, a diaphragm is formed on a mold, and the temperature of the mold is controlled at 50°C.

[0041] (3) Under the protection of nitrogen, the diaphragm was treated with water vapor at a temperature of 80°C for 0.8h, then washed with deionized water three times, and the polyvinyl alcohol (PVA) and dimethylamide (DMF) in the diaphragm were dissolved by water vapor. ), not only makes the diaphragm a microporous diaphragm, but also saves the dissolution time.

[0042] (4)...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a modification method of diaphragms for all vanadium flow batteries, which comprises steps of adding respectively polymethyl methacrylate, polyvinylidene fluoride, polyvinyl alcohol and nano silicon tetroxide according to the mass ratio of 30%-50%, 15%-40%, 5%-10% and 2%-5%, then adding a solvent of dimethylformamide with solute total quality of 10%-30%, and mixing the mixture evenly; subjecting the even mixture to vacuum defoamation to form a diaphragm on a mould; washing the diaphragm with deionized water after subjecting the diaphragm to steam treatment for 0.5-1 hour at the temperature ranging from 70 DEG C to 90 DEG C under the protection of nitrogen; soaking the diaphragm in a modifying agent for 5-10 hours; subjecting the diaphragm to reduction for 2-5 hours in a mixture liquid of 2-6mol / L of sodium bisulphate and 1-2 mol of sulfuric acid; and subjecting the diaphragm to sulfonation treatment for 5-10 hours in 70%-98% of concentrated sulfuric acid. Compared with the prior art, the modification method of diaphragms for all vanadium flow batteries is simple in modifying technology, short in diaphragm processing time, good in permselectivity of produced diaphragms, high in physical and chemical stability, good in conductivity, and capable of reducing production cost.

Description

technical field [0001] The invention relates to the field of battery production, in particular to a method for modifying a diaphragm used in an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery has become one of the most effective energy storage options due to its advantages of low cost, long cycle life, deep discharge, safety, environmental protection, and capacity can be adjusted according to user needs. [0003] The diaphragm is very important to the vanadium battery and is one of the most important components of the vanadium battery system. The diaphragm is the key to determine the performance of the vanadium battery. It separates the electrolyte while allowing the charge carriers (H + , SO 4 2- ) to pass freely to ensure the charge balance of the positive and negative poles. At present, the existing separators have poor selective permeability, low physical and chemical stability, poor electrical conductivity, high product...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M2/16
CPCY02E60/50Y02P70/50
Inventor 张琦宋龙江王皎月杨海波喻春亮
Owner SICHUAN DAZHOU IRON & STEEL GROUP