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SPEEK/modified bentonite composite ion exchange membrane and preparation method thereof

A technology of compounding ions and bentonite, applied in the field of ion exchange membrane, can solve the problems of poor ion selectivity, poor single cell performance, low ion conductivity, etc., and achieve the effects of good battery performance, improved water absorption, and simple modification means.

Active Publication Date: 2022-03-22
北京德泰储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems in the prior art, the invention provides a SPEEK / modified bentonite composite ion exchange membrane and a preparation method thereof, utilizing modified bentonite particles with excellent hydrophilicity and layered structure to adjust ion transmission channels, A binder containing ion-exchange groups is added to jointly improve the ion conductivity, chemical and mechanical stability of the diaphragm. The prepared SPEEK / modified bentonite composite ion-exchange membrane has excellent ion selectivity, ion conductivity, and good Excellent chemical stability and mechanical properties, good battery performance and low cost, etc., overcome the problem of single ion transmission, the obtained composite ion exchange membrane can be applied to a variety of flow battery systems, and solve the ion selection problem existing in the existing diaphragm Poor performance, low ionic conductivity, poor single cell performance and high cost

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  • SPEEK/modified bentonite composite ion exchange membrane and preparation method thereof

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preparation example Construction

[0040] The preparation method of SPEEK / modified bentonite composite ion exchange membrane comprises the following steps:

[0041] Step 1, prepare modified bentonite particles:

[0042] Step 11, dry purification: crushing, grinding and sieving the bentonite to obtain sieved bentonite powder. The number of sieve meshes is 100 mesh to 400 mesh.

[0043] Bentonite is a non-metallic mineral, the main mineral composition is montmorillonite Al 2 [Si 4 o 10 ](OH) 2 · n h 2 O, bentonite in this application is derived from common commercial products, and its main mineral composition structure is as follows: figure 1 shown.

[0044] Step 12, modification treatment: place the sieved bentonite powder in the modification solution with a concentration of 2mol / L~3mol / L at a mass volume ratio of 1g:(3mL~5mL), and use 200r / min~2000r / min Stir at a stirring rate of min for 24h~48h to obtain a modified bentonite suspension.

[0045] The purity of the sieved bentonite powder is 85%~98%. ...

Embodiment 1

[0068] The preparation method of SPEEK / modified bentonite composite ion exchange membrane comprises the following steps:

[0069] (1) Preparation of modified bentonite particles:

[0070] (1.1) Dry purification: crush the bentonite, grind it, and pass through a 100-mesh sieve to obtain sieved bentonite powder with a purity of 95%.

[0071] (1.2) Modification treatment: put 100g of sieved bentonite powder in 300mL of H2O with a concentration of 2mol / L 2 SO 4 In the aqueous solution, stir at a stirring rate of 200 r / min for 24 hours to obtain a modified bentonite suspension.

[0072] The modification degree of bentonite in the modified bentonite suspension is 50%.

[0073] (1.3) High-speed centrifugal purification: centrifuge the modified bentonite suspension obtained in (1.2) for 30 min at a speed of 1000 r / min, and centrifuge twice to obtain a modified bentonite paste.

[0074] (1.4) Roasting modification: Transfer the modified bentonite paste obtained in (1.3) to an oven, a...

Embodiment 2

[0086] The preparation method of SPEEK / modified bentonite composite ion exchange membrane comprises the following steps:

[0087] (1) Preparation of modified bentonite particles:

[0088] (1.1) Dry purification: crush the bentonite, grind it, and pass through a 400-mesh sieve to obtain sieved bentonite powder with a purity of 95%.

[0089] (1.2) Modification treatment: Put 100 g of sieved bentonite powder into 500 mL of 3 mol / L NaCl aqueous solution, and stir at a stirring rate of 2000 r / min for 24 hours to obtain a modified bentonite suspension.

[0090] The modification degree of bentonite in the modified bentonite suspension is 40%.

[0091] (1.3) High-speed centrifugal purification: the modified bentonite suspension was centrifuged at a speed of 20000r / min for 2min, and centrifuged 10 times to obtain a modified bentonite paste.

[0092] (1.4) Roasting modification: transfer the modified bentonite paste to a muffle furnace, and roast it at 120°C for 12 hours. The resultin...

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Abstract

The invention discloses an SPEEK / modified bentonite composite ion exchange membrane and a preparation method thereof. The preparation method comprises the following steps: preparing modified bentonite particles by using a modification liquid; preparing an SPEEK / binder solution by using a binder; adding the modified bentonite particles into the SPEEK / binder solution, and carrying out stirring and ultrasonic treatment to obtain an SPEEK / modified bentonite mixed solution; and pouring the SPEEK / modified bentonite mixed solution into a glass plate, preparing a membrane by adopting a solution casting method, and circularly heating and drying to obtain the SPEEK / modified bentonite composite ion exchange membrane. According to the SPEEK / modified bentonite composite ion exchange membrane and the preparation method thereof, an ion transmission channel is adjusted, the ion conduction performance and the chemical and mechanical stability of a diaphragm are improved, and the obtained composite ion exchange membrane has excellent ion selectivity and ion conductivity and good chemical stability and mechanical performance; the battery performance is good; the cost is low, and the like.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes for redox flow batteries, and in particular relates to a SPEEK / modified bentonite composite ion-exchange membrane and a preparation method thereof. Background technique [0002] Renewable energy is intermittent and unstable, and needs to be combined with large-scale energy storage technology. Flow batteries have the advantages of long cycle life, flexible design, safety and reliability, and fast response, and have broad application prospects in the field of large-scale energy storage. The main problem restricting the development of flow batteries at present is the high cost. As one of the important components of the flow battery, the ion exchange membrane is the main determinant of the cost of the flow battery, and its performance is closely related to the performance of the battery. [0003] An ideal ion-exchange membrane needs to have high proton conductivity, low ion permeation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0243H01M8/0202H01M8/18
CPCH01M8/0243H01M8/0202H01M8/188Y02E60/50
Inventor 贾传坤何慕容丁美
Owner 北京德泰储能科技有限公司
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