Gel polymer electrolyte and preparation method thereof

A gel polymer and electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolyte immobilization/gelation, etc., can solve the problem of low conductivity

Inactive Publication Date: 2014-02-12
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing polyacrylonitrile systems do not have high conductivity as electrolytes

Method used

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  • Gel polymer electrolyte and preparation method thereof

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preparation example Construction

[0033] See figure 1 , The preparation method of the above-mentioned gel polymer electrolyte includes the following steps:

[0034] Step S110, preparing the mesoporous molecular sieve SBA-15.

[0035] The preparation of mesoporous molecular sieve SBA-15 includes the following steps:

[0036] Step S111. Dissolve (1,2-ethylene glycol)-propylene glycol-(1,2-ethylene glycol) block copolymer in hydrochloric acid, then add ethyl orthosilicate dropwise, and stir for 24 hours The above forms a homogeneous solution, in which the mass ratio of (1,2-ethylene glycol)-propylene glycol-(1,2-ethylene glycol) block copolymer to ethyl orthosilicate is 1:2.

[0037] Preferably, the molecular weight of the (1,2-ethylene glycol)-propylene glycol-(1,2-ethylene glycol) block copolymer is 2000 to 10000, preferably 5800.

[0038] Preferably, the mass concentration of hydrochloric acid is 0.1%-10%.

[0039] Preferably, the (1,2-ethylene glycol)-propylene glycol-(1,2-ethylene glycol) block copolymer is dissolved...

Embodiment 1

[0058] The preparation method of the gel polymer electrolyte of this embodiment includes the following steps:

[0059] (1) Preparation of mesoporous molecular sieve SBA-15:

[0060] 10g of triblock copolymer P123 (triblock copolymer poly(1,2-ethylene glycol)-block-poly(propylene glycol)-block-poly(1,2-ethylene glycol) , Average molecular weight 2000) was dissolved in deionized water (20mL) and 20% hydrochloric acid solution (60mL) and stirred and mixed well. Slowly add ethyl orthosilicate (20g) dropwise, continue stirring for more than 24h to form a homogeneous solution, add acetic acid (5g), and continue stirring at 40°C for 24h. Finally, the reaction solution was transferred into an autoclave with a polytetrafluoroethylene substrate, and then crystallized at 100°C for 48 hours, cooled, and the resulting crystal product was suction filtered, washed, and dried at 100°C for 24 hours. Then, it is calcined at 550°C for 4-12h to remove the triblock copolymer, and the mesoporous molec...

Embodiment 2

[0064] The preparation method of the gel polymer electrolyte of this embodiment includes the following steps:

[0065] (1) Preparation of mesoporous molecular sieve SBA-15:

[0066] 10g of triblock copolymer P123 (triblock copolymer poly(1,2-ethylene glycol)-block-poly(propylene glycol)-block-poly(1,2-ethylene glycol) , Average molecular weight 5800) was dissolved in deionized water (20mL) and 30% hydrochloric acid solution (60mL) and stirred and mixed well. Slowly add ethyl orthosilicate (20g) dropwise and continue stirring for more than 24h. After a homogeneous solution was formed, acetic acid (5g) was added, and stirring was continued for 24h at 40°C. Finally, the reaction solution was transferred into an autoclave with a polytetrafluoroethylene substrate, and then crystallized at 100°C for 48 hours, cooled, and the resulting crystal product was suction filtered, washed, and dried at 100°C for 24 hours. Then, it is calcined at 550°C for 4-12h to remove the triblock copolymer,...

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Abstract

A gel polymer electrolyte comprises polyacrylonitrile, an ionic liquid, a lithium salt and mesoporous molecular sieve SBA-15; the ionic liquid is at least one selected from 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide; the lithium slat is at least one selected from lithium tetrafluoroborate, lithium hexafluorophosphate, lithium trifluoromethanesulfonate and lithium bis(trifluoromethanesulfonyl)imide; polyacrylonitrile is the base material, the lithium salt, the ionic liquid and mesoporous molecular sieve SBA-15 are dissolved in polyacrylonitrile; and the mass ratio of polyacrylonitrile, the ionic liquid, the lithium salt and mesoporous molecular sieve SBA-15 is 1:(0.8-1.5):(0.1-0.3):(0.04-0.08). The gel polymer electrolyte is relatively high in electrical conductivity. The invention also provides a preparation method of the gel polymer electrolyte.

Description

Technical field [0001] The invention relates to a gel polymer electrolyte and a preparation method thereof. Background technique [0002] Gel polymer electrolyte lithium ion batteries are valued by researchers because of their safety, no leakage, and low leakage current. Gel polymer electrolyte is a new type of functional polymer material, which can be used as a separator and electrolyte material at the same time, which can make the battery thinner and improve the flexibility of battery shape design. [0003] As a gel polymer electrolyte, the polyacrylonitrile system has the characteristics of simple synthesis, high electrochemical stability, and non-flammability, and is suitable as an electrolyte matrix material. However, the existing polyacrylonitrile system does not have high conductivity when used as an electrolyte. Summary of the invention [0004] Based on this, it is necessary to provide a gel polymer electrolyte with higher conductivity and a preparation method thereof. [...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M10/058H01M2300/0085Y02E60/10
Inventor 周明杰刘大喜王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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