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Gel-type polymer electrolyte used for lithium-sulfur secondary battery system and preparation method

A lithium-sulfur secondary battery, gel-type technology, applied in secondary batteries, electrolyte storage battery manufacturing, non-aqueous electrolyte storage batteries, etc., can solve problems such as poor compatibility, achieve low cost, avoid extraction steps, and improve cycle performance Effect

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor compatibility between the electrolyte and the positive and negative electrode materials in the lithium-sulfur battery system, and provide an elastic self-supporting gel with high ionic conductivity, good compatibility with the positive and negative electrodes, and good flexibility Gel-type polymer electrolyte for lithium-sulfur secondary battery system with state electrolyte membrane and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of gel-type polymer electrolyte. Dissolve 1 g of poly(vinylidene fluoride-hexafluoropropylene) in 5 g of a composite organic solvent composed of ethylene carbonate and diethyl carbonate (mass ratio 1:3), and stir until the solution becomes clear. Then add 1 g of 1-methyl-3-butylimidazole tetrafluoroborate, and stir evenly to obtain a mixed solution. Disperse 0.25g of silica particles in 5ml of acetone solution, add 0.1ml of tetraethoxysilane and ultrasonically shake for 2 hours to obtain a pretreated silica dispersion, and mix the dispersion with 0.5g of lithium hexafluorophosphate-bisoxalate borate A mixed salt of lithium (mass ratio 1:1) is simultaneously added to the mixed solution, and stirred until a transparent and uniform gel solution is obtained. Let the gel solution stand at 30° C. for 3 minutes, then coat it with a coater, and dry it in vacuum at 80° C. for 30 hours to obtain a uniform polymer electrolyte membrane with a thickness of 50 μm. Th...

Embodiment 2

[0034] 1. Preparation of gel-type polymer electrolyte. The preparation of the gel-type polymer electrolyte in this embodiment is different from Embodiment 1 in that: 1 g of polyvinylidene fluoride is used, and the composite organic solvent is composed of 5 g of ethylene carbonate, diethyl carbonate and dimethyl carbonate (three The mass ratio is 1:3:1), the ionic liquid used is composed of 0.5g 1-methyl-3-ethylimidazole hexafluorophosphate and 0.5g chloro-1-ethyl-3-methyl-imidazole The 10g lithium compound salt used is composed of lithium tetrafluoroborate, lithium oxalate borate and lithium perchlorate (the mass ratio of the three is 4:3:3); others are the same as in Embodiment 1. The conductivity measured at room temperature is 0.9×10 -3 S / cm.

[0035] 2. Assembly and testing of lithium-sulfur batteries. In order to test the performance of the gel-type electrolyte membrane in the lithium-sulfur battery system in this example, it was assembled into a lithium-sulfur battery...

Embodiment 3

[0037] 1. Preparation of gel-type polymer electrolyte. Dissolve 1 g of polyacrylonitrile in a composite organic solvent composed of 5 g of propylene carbonate, diethyl carbonate and methyl ethyl carbonate (the mass ratio of the three is 3:1:1), and stir until the solution becomes clear. Then add 1.5 g of trifluoromethylsulfonimide 1-methyl-3-ethylimidazole, difluoromethylsulfonimide 1-methyl-3-butylimidazole, trifluoromethylsulfonyl The ionic liquid composed of the amine 1-methyl-3-butylimidazole (the mass ratio of the three is 1:1:1) is stirred evenly to obtain a mixed solution. Disperse 0.2g of silicon dioxide particles in 4ml of acetone solution, add 0.1ml of tetraethoxysilane and ultrasonically vibrate for 2 hours to obtain a pretreated silicon dioxide dispersion, and mix the dispersion with 3g of lithium perchlorate, The complex lithium salt composed of lithium imide difluoromethanesulfonate and lithium imide trifluoromethanesulfonate (the mass ratio of the three is 1:1:...

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Abstract

The invention relates to a gel-type polymer electrolyte used for a lithium-sulfur secondary battery system, consisting of a polymer support body, an ionic liquid, an organic solvent, a mixed lithium salt and dioxide silicon particles. A preparation method comprises the following steps of: preparing an imidazolium-based ionic liquid, dioxide silicon and composite lithium salt into a gel liquid in a carbonic ester solution dissolved with macromolecular polymers, then coating, drying and obtaining the gel-type polymer electrolyte film. In the gel-type polymer electrolyte prepared by the invention, sulfides in the lithium-sulfur battery system can be effectively prevented from dissolving in a liquid electrolyte solution, the ionic conductivity is high, and noninflammability and no leakage are achieved; and for the polymer electrolyte, the preparation process is simple, and the raw material source is wide, so that the gel-type polymer electrolyte is suitable for industrial production.

Description

Technical field: [0001] The invention relates to a gel-type polymer electrolyte for a lithium-sulfur secondary battery system and a preparation method thereof, belonging to the technical field of lithium secondary battery materials. Background technique: [0002] Compared with the current commercial lithium-ion batteries, the lithium-sulfur battery system has a higher energy density, and its theoretical specific energy reaches 1200Wh / kg. It is considered to be the most attractive battery system. It is used in electric vehicles with high energy density requirements. , Communication equipment, national defense and military industry and other fields have broad development prospects. However, elemental sulfur has poor conductivity and low electrochemical activity; the discharge product lithium-sulfur compound is easily dissolved by the electrolyte solution and reacts with the lithium metal negative electrode, resulting in a series of life and safety problems, which restrict the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 杨娟周向阳娄世菊刘宏专伍上元邹幽兰唐晶晶
Owner CENT SOUTH UNIV
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