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Non-ionized PBI/PVP membrane, preparation method thereof and flow battery

A non-ionized, film-casting liquid technology, used in fuel cells, non-aqueous electrolytes, regenerative fuel cells, etc., can solve the problems of high ionic conductivity, poor ion selectivity, poor ionic conductivity, etc., and achieve high ionic conductivity. , excellent performance, low cost effect

Active Publication Date: 2021-01-15
TAISHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of cation exchange membranes are high ionic conductivity and good chemical stability, but the disadvantages are poor ion selectivity and high cost
The advantages of anion exchange membranes are low cost and good resistance to vanadium, but the disadvantages are poor ion conductivity and poor chemical stability

Method used

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  • Non-ionized PBI/PVP membrane, preparation method thereof and flow battery
  • Non-ionized PBI/PVP membrane, preparation method thereof and flow battery
  • Non-ionized PBI/PVP membrane, preparation method thereof and flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of non-ionization PBI / PVP membrane, its preparation method comprises the following steps:

[0035] Step A: Preparation of PBI / PVP casting solution:

[0036] Add 0.5g PBI / PVP to a 50ml beaker equipped with a stirring device K30 -30% and 20ml N,N-dimethylacetamide, x is 30% refers to PVP K30 quality score;

[0037] Heat and stir at 20°C for 6 hours to dissolve the polymer to form a uniform and transparent PBI / PVP polymer solution;

[0038] After the PBI / PVP polymer solution is cooled to room temperature, air bubbles and insoluble matter are removed after suction filtration to obtain a PBI / PVP casting solution;

[0039] Step B: Film Formation:

[0040] The PBI / PVP film casting solution in step A is formed into a film by casting method, and heated and dried at 60° C. to obtain the PBI / PVP film.

[0041] This embodiment provides a flow battery, including the above-mentioned non-ionized PBI / PVP membrane.

[0042] The following alternative conditions can be used i...

Embodiment 2

[0047] A kind of non-ionization PBI / PVP membrane, its preparation method comprises the following steps:

[0048] Step A: Preparation of PBI / PVP casting solution:

[0049] Add 0.5g of PBI / PVP to a 50ml beaker equipped with a stirring device K18 -40% and 20ml N,N-dimethylacetamide, x is 40% refers to PVP K18 quality score;

[0050] Heat and stir at 40°C for 6 hours to dissolve the polymer to form a uniform and transparent PBI / PVP polymer solution;

[0051] After the PBI / PVP polymer solution is cooled to room temperature, air bubbles and insoluble matter are removed after suction filtration to obtain a PBI / PVP casting solution;

[0052] Step B: Film Formation:

[0053] The PBI / PVP film casting solution in step A is formed into a film by casting method, and heated and dried at 60° C. to obtain the PBI / PVP film.

[0054] This embodiment provides a flow battery, including the above-mentioned non-ionized PBI / PVP membrane.

[0055] The following alternative conditions can be used ...

Embodiment 3

[0060] A kind of non-ionization PBI / PVP membrane, its preparation method comprises the following steps:

[0061] Step A: Preparation of PBI / PVP casting solution:

[0062] Add 0.5g of PBI / PVP to a 50ml beaker equipped with a stirring device K23 -60% and 20ml N,N-dimethylacetamide polymer, x is 60% refers to PVP K23 quality score;

[0063] Heat and stir at 50°C for 6 hours to dissolve the polymer to form a uniform and transparent PBI / PVP polymer solution;

[0064] After the PBI / PVP polymer solution is cooled to room temperature, air bubbles and insoluble matter are removed after suction filtration to obtain a PBI / PVP casting solution;

[0065] Step B: Film Formation:

[0066] The PBI / PVP film casting solution in step A is formed into a film by casting method, and heated and dried at 60° C. to obtain the PBI / PVP film.

[0067] This embodiment provides a flow battery, including the above-mentioned non-ionized PBI / PVP membrane.

[0068] The following alternative conditions ca...

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Abstract

The invention discloses a non-ionized PBI / PVP membrane, a preparation method thereof and a flow battery. The preparation method comprises the following steps: step A: preparation of a PBI / PVP membranecasting solution: adding PBI / PVPKn-x and 10-1000ml of an organic solvent into a container provided with a stirring device, and heating and stirring at 20-60 DEG C until a polymer is dissolved to forma uniform and transparent PBI / PVP solution; after the polymer solution is cooled to the room temperature, removing bubbles and insoluble substances, and obtaining the PBI / PVP membrane casting solution, wherein n is equal to 16, 18, 23 or 30, and x is the mass fraction of PVPKn; and step B, forming a membrane, namely forming the membrane from the PBI / PVP membrane casting solution in the step A, heating and drying to obtain the PBI / PVP membrane. Hydrophilic PVPKn with different mass fractions and different average molecular weights is doped into PBI which is excellent in mechanical property anddoes not contain ether bonds in a main chain to prepare the non-ionized PBI / PVP membrane, and PBI is excellent in mechanical property, high in vanadium resistance and excellent in chemical stability;PVP has a weak base group capable of being protonated, and the conductivity is high. The prepared PBI / PVPKn-x membrane has excellent ionic conductivity, vanadium resistance and battery performance.

Description

technical field [0001] The invention relates to a membrane material for a flow battery, in particular to a non-ionized polymer ion-conducting membrane, a preparation method thereof and a flow battery comprising the non-ionized polymer ion-conducting membrane. Background technique [0002] Vanadium redox flow batteries (VRFBs) are regarded as the most promising ideal energy storage devices due to their advantages such as independent design of power and capacity, deep charging and discharging, green environmental protection, and simple maintenance. [0003] VRFBs use vanadium ions of different valences dissolved in sulfuric acid as the active species for the reaction between the positive and negative electrodes of the battery, and store and release energy through the change of the valence of the reactive species. As the core component of VRFBs, the ion-conducting membrane directly determines the battery life. output performance, cost and life. [0004] Currently existing comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L79/04C08L39/06H01M8/18
CPCC08J5/2275H01M8/188H01M2300/0082C08J2379/04C08J2439/06Y02E60/50
Inventor 谭青龙韩银锋李群贾聪何国芳王昌安程学礼禚林海左健
Owner TAISHAN UNIV
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