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Preparation method of lithium-sulfur battery diaphragm barrier layer based on two-dimensional nano-clay

A lithium-sulfur battery, two-dimensional nanotechnology, which is applied in the field of preparation of a lithium-sulfur battery separator barrier, can solve the problems of weakening the overall energy density of the battery, the thickness and mass of the barrier layer, etc., and achieves excellent cation exchange properties, a simple method, The effect of excellent electrochemical performance

Active Publication Date: 2020-08-25
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the controllable construction of the barrier layer can effectively suppress the polysulfide shuttle effect, but the thickness and mass of the barrier layer are usually large, which weakens the overall energy density of the battery.

Method used

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  • Preparation method of lithium-sulfur battery diaphragm barrier layer based on two-dimensional nano-clay
  • Preparation method of lithium-sulfur battery diaphragm barrier layer based on two-dimensional nano-clay
  • Preparation method of lithium-sulfur battery diaphragm barrier layer based on two-dimensional nano-clay

Examples

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Effect test

Embodiment 1

[0043] A preparation method of a lithium-sulfur battery diaphragm barrier layer based on two-dimensional nanoclay, specifically comprising the following steps:

[0044] (1) Add 6g of montmorillonite powder and 18.9g of anhydrous lithium chloride to 450ml of deionized water, stir and heat in an oil bath at 80°C for 12-48h, dialyze, centrifuge, and freeze-dry the supernatant to obtain montmorillonite aerosol glue.

[0045] (2) Dissolve 500 mg of montmorillonite airgel in 500 mL of deionized water to obtain a 1 mg / mL montmorillonite dispersion.

[0046] (3) Take 500 mg of graphene oxide powder prepared by the improved Hummers method and add it into 500 mL of water for 1 h to obtain a 1 mg / mL graphene oxide dispersion.

[0047] (4) Mix the montmorillonite dispersion obtained in step (2) with the graphene oxide dispersion obtained in step (3) in a certain ratio, so that the ratio of graphene oxide to montmorillonite is 1:1-10:1 mixed dispersion.

[0048] (5) Freeze-drying the mi...

Embodiment 2

[0053] A preparation method of a lithium-sulfur battery diaphragm barrier layer based on two-dimensional nanoclay, specifically comprising the following steps:

[0054] (1) Add 4g of montmorillonite powder and 10g of anhydrous lithium chloride to 450ml of deionized water, stir and heat in an oil bath at 70°C for 12-48h, dialyze, centrifuge, and freeze-dry the supernatant to obtain montmorillonite airgel .

[0055] (2) Dissolve 500 mg of freeze-dried montmorillonite powder in 500 ml of deionized water to obtain a 1 mg / mL montmorillonite dispersion.

[0056] (3) Take 500 mg of graphene oxide powder prepared by the improved Hummers method and add it into 500 mL of water for 1 h to obtain a 1 mg / mL graphene oxide dispersion.

[0057] (4) Mix the montmorillonite dispersion obtained in step (2) with the graphene oxide dispersion obtained in step (3) in a certain ratio, so that the ratio of graphene oxide to montmorillonite is 1:1-10:1 mixed dispersion.

[0058] (5) Freeze-drying ...

Embodiment 3

[0063] A preparation method of a lithium-sulfur battery diaphragm barrier layer based on two-dimensional nanoclay, specifically comprising the following steps:

[0064] (1) Add 6g of montmorillonite powder and 80g of anhydrous lithium chloride to 450ml of deionized water, stir and heat in an oil bath at 100°C for 12-48h, dialyze, centrifuge, and freeze-dry the supernatant to obtain montmorillonite airgel .

[0065] (2) Dissolve 500 mg of freeze-dried montmorillonite powder in 500 ml of deionized water to obtain a 1 mg / mL montmorillonite dispersion.

[0066] (3) Take 500 mg of graphene oxide powder prepared by the improved Hummers method and add it into 500 mL of water for 1 h to obtain a 1 mg / mL graphene oxide dispersion.

[0067] (4) Mix the montmorillonite dispersion obtained in step (2) with the graphene oxide dispersion obtained in step (3) in a certain ratio, so that the ratio of graphene oxide to montmorillonite is 1:1-10:1 mixed dispersion.

[0068] (5) Freeze-drying...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery diaphragm barrier layer based on two-dimensional nano clay, and particularly relates to a preparation method for controllably constructing a diaphragm barrier layer with an efficient inhibition effect on polysulfide shuttling based on two-dimensional nano montmorillonite or vermiculite lamellas as basic units. The barrier layer prepared by the invention is composed of a two-dimensional nano-clay sheet layer with an efficient catalytic effect and graphene with high electronic conductivity; the barrier layer and the diaphragm substrate are tightly combined through a vacuum filtration method; the barrier layer effectively inhibits polysulfide shuttling through the structure and surface chemical regulation and control oftwo-dimensional nano montmorillonite or vermiculite; and finally, the electrochemical performance of the lithium-sulfur battery is improved. The construction method of the lithium-sulfur battery diaphragm barrier layer provided by the invention is simple and easy to implement, low in cost and suitable for large-scale production; and the barrier layer has the beneficial effects of good flexibility,high mechanical strength and easiness in property control.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery diaphragm barrier layer, in particular to a preparation method of a clay-based lithium-sulfur battery diaphragm barrier layer. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, it is imminent to vigorously develop new energy sources. Due to its high theoretical specific capacity (1675mAh / g), lithium-sulfur batteries are considered to be one of the most potential new energy storage devices that can meet energy and market demands. However, the "shuttle effect" of polysulfides greatly limits The practical application of lithium-sulfur batteries. At present, strategies to suppress the shuttle effect mainly include adding materials that can effectively adsorb and catalyze the conversion of polysulfides to the positive electrode, introducing additives that inhibit polysulfide shuttle into the electrolyte, and constructing a barrier ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/409Y02E60/10
Inventor 邵姣婧周文华
Owner GUIZHOU UNIV
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