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Speek/modified bentonite composite ion exchange membrane and its preparation method

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

Active Publication Date: 2022-05-20
北京德泰储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 its preparation method

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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 a SPEEK / modified bentonite composite ion exchange membrane and a preparation method thereof, comprising: preparing modified bentonite particles by using a modifying solution; preparing SPEEK / binder solution by using a binder; / binder solution, after stirring and ultrasonication, the SPEEK / modified bentonite mixed solution is obtained; the SPEEK / modified bentonite mixed solution is poured into a glass plate, and the solution casting method is used to prepare a film, and the SPEEK is obtained by circulating temperature and drying. / Modified bentonite composite ion exchange membrane. The SPEEK / modified bentonite composite ion exchange membrane of the present invention and its preparation method can adjust the ion transmission channel, improve the ion conductivity, chemical and mechanical stability of the diaphragm, and the obtained composite ion exchange membrane has excellent ion selectivity, ion conductivity, and good Excellent chemical stability and mechanical properties, good battery performance and low cost.

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 Patents(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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