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Preparation method of lithium-sulfur battery diaphragm

A technology for lithium-sulfur batteries and diaphragms, which is applied in the field of preparation of lithium-sulfur battery diaphragms, can solve serious problems such as the inability to take into account the shuttle effect, and achieve the effect of taking into account the thickness, suppressing the shuttle effect, and improving electrical performance

Inactive Publication Date: 2020-03-24
长沙凯泽工程设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of a lithium-sulfur battery separator to solve technical problems such as thickness, strength, and porosity that cannot be balanced and serious shuttling effects.

Method used

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  • Preparation method of lithium-sulfur battery diaphragm
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  • Preparation method of lithium-sulfur battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of a lithium-sulfur battery diaphragm, in parts by weight, the specific steps are as follows:

[0035] (1) First blend 1 part of glass fiber, 2.5 parts of polyamide fiber and 0.3 part of water-soluble vinylon fiber into yarn, and weave it into cloth to obtain the base film;

[0036] (2) Next, mix 8 parts of polyurethane fibers, 5 parts of nanocrystalline cellulose, 0.1 parts of carboxypolystyrene microspheres, 0.5 parts of sodium lignosulfonate, and 0.4 parts of tetraethyl orthosilicate into 40 parts of water, and disperse Evenly, the gelatinous slurry is obtained, which is equally divided into two parts, and is uniformly extruded to the two surfaces of the base film obtained in step (1) respectively;

[0037] (3) Coagulate to form a film, extrude, hot press, heat treatment and toluene washing in sequence, and supercritical drying to obtain the lithium-sulfur battery separator (10 μm).

[0038] Preferably, the lithium-sulfur battery separator has a t...

Embodiment 2

[0053] A preparation method of a lithium-sulfur battery diaphragm, in parts by weight, the specific steps are as follows:

[0054] (1) First blend 1 part of glass fiber, 3 parts of polyamide fiber and 0.4 part of water-soluble vinylon fiber into yarn, and weave it into cloth to obtain the base film;

[0055] (2) Next, mix 10 parts of polyurethane fibers, 6 parts of nanocrystalline cellulose, 0.3 parts of carboxypolystyrene microspheres, 0.8 parts of sodium lignosulfonate, and 0.6 parts of tetraethyl orthosilicate into 50 parts of water, and disperse Evenly, the gelatinous slurry is obtained, which is equally divided into two parts, and is uniformly extruded to the two surfaces of the base film obtained in step (1) respectively;

[0056] (3) Coagulate to form a film, extrude, hot-press form, heat treatment and toluene washing in sequence, and supercritical drying to obtain the lithium-sulfur battery separator (12 μm).

[0057] In step (1), the length of the glass fiber is 12 m...

Embodiment 3

[0071] A preparation method of a lithium-sulfur battery diaphragm, in parts by weight, the specific steps are as follows:

[0072] (1) First blend 1 part of glass fiber, 2.5 parts of polyamide fiber and 0.4 part of water-soluble vinylon fiber into yarn, and weave it into cloth to obtain the base film;

[0073] (2) Next, mix 8 parts of polyurethane fibers, 6 parts of nanocrystalline cellulose, 0.1 parts of carboxypolystyrene microspheres, 0.8 parts of sodium lignosulfonate, and 0.4 parts of tetraethyl orthosilicate into 50 parts of water, and disperse Evenly, the gelatinous slurry is obtained, which is equally divided into two parts, and is uniformly extruded to the two surfaces of the base film obtained in step (1) respectively;

[0074] (3) Coagulate to form a film, extrude, hot press, heat treatment and toluene washing in sequence, and supercritical drying to obtain the lithium-sulfur battery separator (10 μm).

[0075] In step (1), the length of the glass fiber is 10 mm, t...

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Abstract

The invention provides a preparation method of a lithium-sulfur battery diaphragm. The method comprises: firstly, blending and weaving glass fibers, polyamide fibers and water-soluble vinylon fibers into a base film; securing basic strength, then preparing gel slurry from polyurethane fibers, nano microcrystalline cellulose, carboxyl polystyrene microspheres, sodium lignin sulfonate, tetraethyl orthosilicate and the like as raw materials, and extruding the gel slurry to two surfaces of the base membrane; finally, obtaining the diaphragm suitable for the lithium-sulfur battery through a seriesof post-treatment. The thickness, the strength, the porosity and the like are considered, the shuttle effect is inhibited, and the electrical property of the lithium-sulfur battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a lithium-sulfur battery diaphragm. Background technique [0002] With the popularity of portable electronic devices and electric vehicles, traditional lithium-ion batteries have been unable to meet the high energy density requirements of reversible batteries. Lithium-sulfur battery is a promising new battery system because of its high theoretical specific capacity (1675mAh / g) and energy density (2600Wh / kg), abundant raw materials, good environmental protection, and low cost. [0003] The charge-discharge process of lithium-sulfur batteries is a multi-electron reaction accompanied by a complex phase transition process. When the electrochemical reaction occurs, the intermediate discharge product dissolves in the electrolyte and circulates between the positive and negative electrodes. However, lithium polysulfide, an intermediate product formed d...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 不公告发明人
Owner 长沙凯泽工程设计有限公司
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