Gel electrolyte and preparation method thereof and corresponding anode and lithium sulfur battery

A gel electrolyte, lithium-sulfur battery technology, applied in non-aqueous electrolyte batteries, lithium batteries, battery electrodes, etc., can solve problems such as poor battery cycle performance, achieve high conductivity, be conducive to large-scale industrial production, and simple process Effect

Active Publication Date: 2011-10-05
DONGFANG ELECTRIC CORP LTD
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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 overcome the defects in the prior art that the positive electrode sulfur and reactants are easily soluble in the liquid electrolyte, resulting in poor cycle performance of the battery, to provide a gel electrolyte and a preparation method, and a lithium-sulfur battery with good cycle performance. The gel electrolyte is semi-solid and contains a certain amount of liquid electrolyte in the gel pores, which can not only avoid the dissolution of the sulfur cathode and reactants, but also greatly improve the ion conductivity. The lithium-sulfur battery using this electrolyte has greatly improved cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Gel electrolyte solution: In a flowing nitrogen atmosphere, the number average molecular weight is 6.0×10 5 Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP, of which HFP content is 10%), silicon dioxide with a particle size of 50 nm and a solvent containing 1.0 mol / L lithium hexafluorophosphate (propylene carbonate and diethyl carbonate ) at a mass ratio of 1:0.5:(3+7), and stirred at 75°C until dissolved.

[0029] Positive electrode: In a nitrogen atmosphere, the above-mentioned gel electrolyte solution was evenly coated on the surface of the positive electrode with a coating thickness of 80 microns.

[0030] Lithium-sulfur battery: use the above-mentioned positive electrode coated with gel electrolyte, use 130 micron lithium foil as the negative electrode, and 20 micron PE porous film as the separator, and prepare button cells in a humidity-controlled glove box. The preparation method of the lithium-sulfur battery can be known to those skilled in the art.

[0...

Embodiment 2

[0035] Gel electrolyte solution: In a flowing nitrogen atmosphere, the number average molecular weight is 6.0×10 5 Polyethylene oxide (PEO), silicon dioxide with a particle size of 50 nm and a solvent containing 1.0 mol / L lithium hexafluorophosphate (propylene carbonate and diethyl carbonate) are mixed at a mass ratio of 1:0.5:(3+7) , stirred at 75 °C until dissolved.

[0036] Positive electrode: In a nitrogen atmosphere, the above-mentioned gel electrolyte solution was uniformly coated on the surface of the positive electrode with a coating thickness of 10 microns.

[0037] Lithium-sulfur battery: use the above-mentioned positive electrode coated with gel electrolyte, use 130 micron lithium foil as the negative electrode, and 20 micron PE porous film as the separator, and prepare button cells in a humidity-controlled glove box.

[0038] High-temperature storage: store the above-mentioned lithium-sulfur battery at 75°C for 12 hours.

[0039] Comparative preparation:

[0040...

Embodiment 3

[0042] Gel electrolyte solution: In a flowing nitrogen atmosphere, the number average molecular weight is 6.0×10 5 Polymethyl methacrylate (PMMA), silicon dioxide with a particle size of 50 nm, and a solvent containing 1.0 mol / L lithium hexafluorophosphate (propylene carbonate and diethyl carbonate) at a mass ratio of 1:0.5:(3+ 7) Mix and stir at 75°C until dissolved.

[0043] Positive electrode: In a nitrogen atmosphere, the above-mentioned gel electrolyte solution was evenly coated on the surface of the positive electrode with a coating thickness of 150 microns.

[0044] Lithium-sulfur battery: use the above-mentioned positive electrode coated with gel electrolyte, use 130 micron lithium foil as the negative electrode, and 20 micron PE porous film as the separator, and prepare button cells in a humidity-controlled glove box.

[0045] High-temperature storage: store the above-mentioned lithium-sulfur battery at 75°C for 12 hours.

[0046] Comparative preparation:

[0047] ...

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Abstract

The invention discloses gel electrolyte, which comprises a polymer matrix material, a non-aqueous solvent and an inorganic filler in a mass ratio of 1:5:0.1-1:20:1 and also comprises electrolyte containing 0.5 to 2.0 mol/L of electrolyte lithium salt. The invention also discloses a preparation method of the gel electrolyte. The preparation method comprises the following steps of: mixing the polymer matrix material, the non-aqueous solvent, the inorganic filler and the electrolyte containing the electrolyte lithium salt in an inert atmosphere, and stirring the mixed solution till dissolving at the temperature of between 40 and 90 DEG C. The invention also discloses an anode and a lithium sulfur battery prepared by using the gel electrolyte. The gel electrolyte provided by the invention has high ionic conductivity, and can avoid the dissolution of the sulfur anode and the reactants; the lithium sulfur battery containing the gel electrolyte has good cycle performance; and the method is simple, does not need a large amount of extracting agent, is safe and environment-friendly, and is favorable for large-scale industrialized production.

Description

technical field [0001] The invention relates to technologies in the field of electrolyte preparation and lithium-sulfur batteries, in particular to a gel electrolyte capable of improving the cycle characteristics of lithium-sulfur batteries and a preparation method thereof, as well as positive electrodes and lithium-sulfur batteries containing the electrolyte. Background technique [0002] In recent years, with the development of mobile electronic devices in the direction of miniaturization, lightness, density and thinness, higher requirements are placed on the energy density of batteries. Compared with other batteries, lithium-sulfur batteries have better advantages in terms of energy density: the energy density of lithium used as the negative active material is 3830mAh / g; while the sulfur (S 8 ) with an energy density of 1675mAh / g, and these materials are cheap and environmentally friendly. [0003] However, lithium-sulfur batteries have not been applied on a large scale ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M4/137H01M4/1397H01M10/052
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 谢皎胡蕴成王荣贵王睿
Owner DONGFANG ELECTRIC CORP LTD
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