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Lithium silicate modified solid polymer electrolyte material and preparation method thereof

A technology of solid polymer and lithium silicate, which is applied in the direction of solid electrolyte, composite electrolyte, non-aqueous electrolyte, etc., can solve the problem of low ionic conductivity, achieve the goal of improving electrolyte performance, reducing cost, comprehensive performance and application prospect Effect

Pending Publication Date: 2020-02-11
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

Introducing lithium silicate as a modified filler into the PEO polymer electrolyte can solve the problem of low ionic conductivity caused by high crystallinity at room temperature to a certain extent.

Method used

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  • Lithium silicate modified solid polymer electrolyte material and preparation method thereof
  • Lithium silicate modified solid polymer electrolyte material and preparation method thereof
  • Lithium silicate modified solid polymer electrolyte material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1: LiTFSi, PEO (M w =9×10 5 gmol -1 ), the ball-milled lithium silicate was dried in a vacuum oven at 50°C for 24 hours, and placed in a glove box for subsequent use.

[0050] Step 2: Weigh the PEO, LiTFSi and lithium silicate obtained by drying in step 1 in proportion. The quality of lithium silicate is 5%wt of the total mass of the polymer substrate and lithium salt, and 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.

[0051] 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.

[0052] 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 a PEO-based solid polymer electrolyte with lit...

Embodiment 2

[0054] Step 1: LiTFSi, PEO (M w =9×10 5 gmol -1 ), the ball-milled lithium silicate was dried in a vacuum oven at 50°C for 24 hours, and placed in a glove box for subsequent use.

[0055] Step 2: Weigh the PEO, LiTFSi and lithium silicate obtained by drying in step 1 in proportion. The quality of lithium silicate 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.

[0056] 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.

[0057] 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 a PEO-based solid polymer electrolyte with lithiu...

Embodiment 3

[0059] Step 1: LiTFSi, PEO (M w =9×10 5 gmol -1 ), the ball-milled lithium silicate was dried in a vacuum oven at 50°C for 24 hours, and placed in a glove box for subsequent use.

[0060] Step 2: Weigh the PEO, LiTFSi and lithium silicate obtained by drying in step 1 in proportion. The quality of lithium silicate 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.

[0061] 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.

[0062] 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 a PEO-based solid polymer electrolyte with lithiu...

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Abstract

The invention relates to a lithium silicate modified solid polymer electrolyte material and a preparation method thereof. The lithium silicate modified solid polymer electrolyte is prepared by selecting lithium silicate as modified filler of the polymer solid electrolyte, polyepoxyethylene as a matrix and lithium perchlorate or lithium bis(trifluoromethanesulfonyl)imide as a lithium salt through asolution casting method. The introduced lithium silicate is decomposed to form amorphous silicon dioxide and lithium oxide which can be used as the electrolyte modified filler, and thereby great contribution to improvement of performance of the electrolyte is achieved. The modified solid polymer electrolyte prepared by the method has good ionic conductivity, electrochemical stability and thermalstability, is suitable for a lithium ion battery under certain conditions, and can greatly improve safety performance.

Description

technical field [0001] The invention belongs to the field of lithium battery electrolytes, and relates to a lithium silicate modified solid polymer electrolyte and a preparation method. Background technique [0002] Under the dual pressure of energy crisis and environmental pollution, countries all over the world are striving to develop lithium batteries with high energy density and high safety. Due to the use of flammable liquid electrolytes in traditional lithium batteries, safety issues limit the further improvement of its performance, but lithium batteries with high energy density are essential for electronic equipment, electric vehicles and large-scale energy storage systems. In view of safety Due to the advantages of high performance and energy density, all-solid-state batteries have become the only way for the development of lithium batteries in the future, and solid-state electrolytes are an important part of all-solid-state batteries. [0003] Solid polymer electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/052H01M2300/0082H01M2300/0085H01M2300/0088Y02E60/10
Inventor 马越孙长春张敏
Owner 陕西瑞智新能源科技有限公司
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