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Lithium ion battery ionic liquid based gel polymer electrolyte as well as preparation and applications thereof

A lithium ion battery and ionic liquid technology, applied in the field of lithium ion battery ionic liquid-based gel polymer electrolyte and preparation thereof, can solve the problems of poor compatibility of negative electrode materials, poor mechanical strength, unfavorable industrial production and the like, and achieve electrochemical performance. Effects of improved performance, improved mechanical strength, excellent absorbency and fluid retention

Inactive Publication Date: 2011-11-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent application with the application number 200910304356.3 discloses "Lithium-ion battery gel-type ionic liquid / polymer electrolyte and its preparation method". prepared by the method, which solves the problem of poor compatibility between imidazole-based ionic liquids and negative electrode materials for lithium-ion batteries, but the highest ionic conductivity is only 0.53×10 -3 S cm -1 , and does not use a support body to support, the mechanical strength is poor, which is not conducive to industrial production

Method used

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  • Lithium ion battery ionic liquid based gel polymer electrolyte as well as preparation and applications thereof
  • Lithium ion battery ionic liquid based gel polymer electrolyte as well as preparation and applications thereof
  • Lithium ion battery ionic liquid based gel polymer electrolyte as well as preparation and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) According to the example 1 of the national invention patent whose patent number is ZL 200810029569.5 and the name is "self-supporting lithium ion battery gel polymer electrolyte, its special polymer and its preparation method and application", P(MMA -AN-Vac), the polymer poly(methyl methacrylate-acrylonitrile-vinyl acetate).

[0047] (2) Under a nitrogen atmosphere, dissolve 3g of polymer poly(methyl methacrylate-acrylonitrile-vinyl acetate) in 97g of acetone, add 4.85g of deionized water as a non-solvent, and add 1.5g of inorganic Ceramic material Al 2 o 3 , heated and stirred with a flask with a reflux tube at 35°C for 2 hours, the polymer was completely dissolved, and a gel liquid was obtained;

[0048] (3) Soak the unactivated support body (polyethylene, PE) in the gel liquid obtained in step (1), take it out after 15 minutes, and dry it naturally to prepare a heat-shrinkable doped inorganic ceramic material Lithium-ion battery polymer separator;

[0049] (4...

Embodiment 2

[0052] (1) According to the example 1 of the national invention patent whose patent number is ZL 200610123986.7 and the name is "a preparation method and application of a gel-state lithium-ion battery polymer electrolyte", P(MMA-VAc) is prepared, that is, polymerized Poly(methyl methacrylate-vinyl acetate).

[0053] (2) Under an argon atmosphere, 3g polymer poly(methyl methacrylate-vinyl acetate) was dissolved in 97g mixed solvent (acetone and N, N-dimethylformamide (DMF) by mass ratio 2: 1 mixed), add 9.7g of deionized water as a non-solvent, and add 1.5g of inorganic ceramic material SiO 2 , heating and stirring with a flask with a reflux tube at a temperature of 40°C for 3 hours, the polymer is completely dissolved, and a gel liquid is obtained;

[0054] (3) Soak the unactivated support polypropylene in the gel liquid obtained in step (1), take it out after 20 minutes, and dry it naturally to prepare a lithium ion battery doped with an inorganic ceramic material resistant ...

Embodiment 3

[0058] (1) Under an argon atmosphere, mix and dissolve 2.5g of polymer poly(methyl methacrylate) and 2.5g of polyethylene oxide in 95g of acetone, add 14.25g of deionized water as a non-solvent, and add 5g of Inorganic Ceramic Material TiO 2 , heated and stirred with a flask with a reflux tube for 4 hours at a temperature of 50°C, the polymer was completely dissolved, and a gel liquid was obtained;

[0059] (2) Soak the unactivated support body non-woven fabric in the gel liquid obtained in step (1), take it out after 10 minutes, and dry it naturally, that is, the lithium ion doped inorganic ceramic material resistant to heat shrinkage is prepared. Battery polymer separator;

[0060] (3) Lithium salt lithium hexafluorophosphate (LiPF 6 ) is dissolved in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) to form an ionic liquid-based electrolyte with a concentration of 0.3mol / kg, and an amount equivalent to the mass of the ionic liquid is...

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Abstract

The invention discloses a lithium ion battery ionic liquid based gel polymer electrolyte as well as a preparation method and applications thereof. The method comprises the following steps: dissolving a polymer into an organic solvent; then adding deionized water and an inorganic ceramic material, thus obtaining a gel liquid; soaking an non-activated supporting body in the gel liquid; taking out and airing, thus a heat-resistant contracted lithium ion battery polymer diaphragm doped with the inorganic ceramic materials is obtained; dissolving lithium salt in an ion liquid, and adding a film formation addition agent, thus an ion liquid based electrolyte capable of gelating the polymer diaphragm is obtained; and soaking the dried heat-resistant contracted lithium ion battery polymer diaphragm doped with the inorganic ceramic material in the ion liquid based electrolyte, thus the heat-resistant contracted lithium ion battery ionic liquid based gel polymer electrolyte doped with the inorganic ceramic material is obtained. The preparation method is simple, and the safety performance, mechanical intensity and electromechanical performance of the lithium ion battery ionic liquid based gel polymer electrolyte are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an ionic liquid-based gel polymer electrolyte for lithium ion batteries and a preparation method and application thereof. Background technique [0002] The requirements of energy saving and environmental protection have promoted the development of new energy sources. As an energy storage device in the direction of new energy development, recyclable secondary batteries play a major role. Compared with lead-acid batteries and nickel-metal hydride batteries, secondary lithium-ion batteries have incomparable advantages such as high energy density, high operating voltage, and good cycle performance, and are widely used in portable energy devices. At present, commercial lithium-ion batteries generally use liquid flammable and volatile organic solvents as electrolytes, but the safety issues behind the use of liquid electrolytes have attracted more and more attention from lithium ba...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 廖友好李小平饶睦敏李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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