Metal organic framework material modified PEO-based fire safety type solid polymer electrolyte and preparation method thereof

A metal-organic framework and solid polymer technology, applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problem of flammability reduction, fire safety of lithium-ion battery systems, safety cannot be guaranteed, and poor electrochemical stability and other issues, to achieve the effect of improving electrochemical stability and ionic conductivity, improving fire safety, and improving safety performance

Pending Publication Date: 2020-11-06
陕西瑞智新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polyethylene oxide (PEO) has been widely studied due to its good complexation ability with lithium ions, but the high cost of modified fillers, poor electrochemical stability and low ionic conductivity have become a major obstacle to its large-scale application.
On the other hand, PEO is a kind of flammable polymer. When it is used as a polymer substrate in a solid polymer electrolyte, its flammability reduces the fire safety of the lithium-ion battery system, making the safety impossible. Guaranteed

Method used

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  • Metal organic framework material modified PEO-based fire safety type solid polymer electrolyte and preparation method thereof
  • Metal organic framework material modified PEO-based fire safety type solid polymer electrolyte and preparation method thereof
  • Metal organic framework material modified PEO-based fire safety type solid polymer electrolyte and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: LiTFSI, PEO (M w =9×10 5 gmol -1 ), HKUST-1 MOF materials were dried in a vacuum oven at 50°C for 24 hours, and placed in a glove box for later use.

[0036] Step 2: Weigh PEO, LiTFSI and HKUST-1 obtained in step 1 in proportion, the mass of HKUST-1 is 5%wt of the total mass of the polymer substrate and lithium salt, control EO: Li + The molar ratio is 15:1. Put the weighed drug into a beaker, add acetonitrile (the mass is 9 times the total mass of the weighed drug), and stir vigorously at room temperature for 12 hours.

[0037] Step 3: Pour the obtained solution onto a polytetrafluoroethylene plate, let it advect naturally, and evaporate the solvent in a fume hood at room temperature.

[0038] Step 4: Tear off the film and place it in a polytetrafluoroethylene petri dish, and dry it in a vacuum oven at 60°C for 12 hours to further remove the solvent to obtain HKUST-1 as a modified filler PEO-based fire-safe solid polymer electrolyte.

Embodiment 2

[0040] Step 1: LiTFSI, PEO (M w =9×10 5 gmol -1 ), HKUST-1 MOF materials were dried in a vacuum oven at 50°C for 24 hours, and placed in a glove box for later use.

[0041] Step 2: Weigh the PEO, LiTFSI and HKUST-1 obtained in Step 1 in proportion. The mass of HKUST-1 is 10%wt of the total mass of the polymer substrate and lithium salt. Control EO: Li + The molar ratio is 15:1. Put the weighed drug into a beaker, add acetonitrile (the mass is 9 times the total mass of the weighed drug), and stir vigorously at room temperature for 12 hours.

[0042] Step 3: Pour the obtained solution onto a polytetrafluoroethylene plate, let it advect naturally, and evaporate the solvent in a fume hood at room temperature.

[0043] Step 4: Tear off the film and place it in a polytetrafluoroethylene petri dish, and dry it in a vacuum oven at 60°C for 12 hours to further remove the solvent to obtain HKUST-1 as a modified filler PEO-based fire-safe solid polymer electrolyte.

Embodiment 3

[0045] Step 1: LiTFSI, PEO (M w =9×10 5 gmol -1 ), HKUST-1 MOF materials were dried in a vacuum oven at 50°C for 24 hours, and placed in a glove box for later use.

[0046] Step 2: Weigh the PEO, LiTFSI and HKUST-1 obtained in Step 1 in proportion, the mass of HKUST-1 is 15%wt of the total mass of the polymer substrate and lithium salt, control EO: Li + The molar ratio is 15:1. Put the weighed drug into a beaker, add acetonitrile (the mass is 9 times the total mass of the weighed drug), and stir vigorously at room temperature for 12 hours.

[0047] Step 3: Pour the obtained solution onto a polytetrafluoroethylene plate, let it advect naturally, and evaporate the solvent in a fume hood at room temperature.

[0048] Step 4: The membrane was torn off and placed in a polytetrafluoroethylene petri dish, and dried in a vacuum oven at 60°C for 12 hours to further remove the solvent to obtain HKUST-1 as a modified filler based on PEO-based fire-safe solid polymer electrolyte.

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Abstract

The invention relates to a metal organic framework material modified PEO-based fire safety type solid polymer electrolyte and a preparation method thereof. The metal organic framework material is usedas a polymer solid electrolyte, polyepoxyethylene and lithium bis (trifluoromethanesulfonyl) imide, and the metal organic framework material modified fire safety type solid polymer electrolyte is prepared through a solution casting method. And the introduced metal organic framework material further releases more lithium ions capable of being freely conducted, so that a great contribution is madeto the improvement of the electrochemical performance of the electrolyte. Meanwhile, due to the unique catalytic property of the metal organic framework material, the formation of a carbon layer can be catalyzed and protected in the combustion process of the polymer, and further combustion is inhibited, so that the fire safety is improved. The modified solid polymer electrolyte prepared by the method has good ionic conductivity, electrochemical stability and thermal stability, is suitable for a lithium ion battery under certain conditions, and can greatly improve the safety performance.

Description

technical field [0001] The invention belongs to the field of lithium battery electrolytes, and relates to a PEO-based fire-safe solid polymer electrolyte modified by a metal organic framework material and a preparation method thereof. Background technique [0002] Due to its high energy ratio, long cycle life, and clean and pollution-free characteristics, lithium-ion batteries have gradually become the most promising new green energy system in the 21st century. In daily life, due to battery abuse and severe impacts, battery combustion or explosion accidents occasionally occur, causing people to worry about the safety of lithium-ion batteries. Therefore, it is necessary to develop electrolyte materials with fire safety. All-solid-state batteries have become The only way for the development of lithium batteries in the future, among which solid polymer electrolytes are regarded as one of the important development directions in the future. Solid polymer electrolytes composed of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058A62C3/16
CPCH01M10/0565H01M10/058A62C3/16H01M2300/0091H01M2200/00Y02E60/10Y02P70/50
Inventor 马越孙长春
Owner 陕西瑞智新能源科技有限公司
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