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Multilayer composite structure diaphragm, preparation method thereof and lithium-sulfur battery

A multi-layer composite and diaphragm technology, applied in structural parts, secondary batteries, battery pack parts, etc., can solve problems such as hindering the performance of lithium-sulfur batteries, increasing electrolyte viscosity, lithium dendrites and dead lithium, etc. Achieve the effect of reducing security risks, reducing polarization, and improving utilization

Active Publication Date: 2022-04-12
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the positive electrode of the lithium-sulfur battery will dissolve polysulfide ions during the electrochemical reaction, resulting in the formation of a shuttle effect; and the viscosity of the electrolyte is likely to increase, causing side reactions and unnecessary consumption; at the same time, the lithium metal negative electrode is also easy to form Lithium dendrites and dead lithium, etc., these problems hinder the improvement of the performance of lithium-sulfur batteries

Method used

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  • Multilayer composite structure diaphragm, preparation method thereof and lithium-sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Prepare the diaphragm:

[0042] Add carboxymethylcellulose sodium CMC (binder) and polyvinylidene fluoride-hexafluoropropylene copolymer (hydrophobic polymer) to deionized water at a mass ratio of 21:79, and mix to obtain a solid content of 4%. suspension, that is, the glue layer slurry;

[0043] Combine CMC and Li 14 Zn(GeO 4 ) 4 Disperse in deionized water with a mass ratio of 46:54, and mix to obtain a slurry with a solid content of 16%, that is, the lithium ion-conducting layer slurry;

[0044] CMC and Super P are dispersed in deionized water with a mass ratio of 3:97, and mixed to obtain a slurry with a solid content of 2%; The solid content can be 0.5% to 30%;

[0045] The PP / PE / PP diaphragm with a thickness of 25 microns produced by Celgard is used as the substrate diaphragm 1, and the prepared adhesive layer slurry is coated on the substrate diaphragm by gravure coating or dip coating or scraping or spraying. On the surface of both sides of 1, the adhesive...

Embodiment 2

[0063] Prepare the diaphragm:

[0064] Add polyacrylic acid and polyvinylidene fluoride (hydrophobic polymer) to deionized water at a mass ratio of 1:99 to prepare a glue layer slurry with a solid content of 10%;

[0065] Disperse LA133 (binder, produced by Chengdu Yindile Co., Ltd.) and LiPON (lithium-ion conductor material) in deionized water at a mass ratio of 5:95 to form a lithium-ion-conducting layer slurry with a solid content of 3%. ;

[0066] Disperse CMC (binder) and polyacrylonitrile (conductive polymer) in deionized water with a mass ratio of 25:75 to form a conductive layer slurry with a solid content of 6%;

[0067] The 12-micron polyethylene diaphragm produced by Shanghai Enjie Company was used as the substrate diaphragm, and the prepared adhesive layer slurry was coated on both sides of the substrate diaphragm to form an adhesive layer with a thickness of 3 microns;

[0068] Coating the prepared lithium-ion-conducting layer slurry on the adhesive layer on one...

Embodiment 3

[0076] Prepare the diaphragm:

[0077] LA133 and polyvinylidene fluoride (hydrophobic polymer) were added to deionized water at a mass ratio of 50:50 to prepare a glue layer slurry with a solid content of 28%;

[0078] Combine CMC and Li 7 La 3 Zr 2 o 12 (Lithium-ion conductor material) is dispersed in deionized water with a mass ratio of 27:73 to form a lithium-ion-conducting layer slurry with a solid content of 12%;

[0079] Disperse sodium alginate (binder) and carbon black ECP-600JD (conductive polymer) in deionized water at a mass ratio of 48:52 to form a conductive layer slurry with a solid content of 13%;

[0080] A 9-micron polyethylene diaphragm produced by Japan Asahi Kasei Co., Ltd. was used as the substrate diaphragm, and the prepared adhesive layer slurry was coated on both sides of the substrate diaphragm to form an adhesive layer with a thickness of 5 microns;

[0081] Coating the prepared lithium-ion-conducting layer slurry on the adhesive layer on one sid...

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Abstract

A multi-layer composite structure diaphragm and its preparation method and lithium-sulfur battery, the multi-layer composite structure diaphragm includes a base material diaphragm, an adhesive layer is formed on both sides of the base material diaphragm; A conductive layer is formed on the glue layer, and a lithium ion conducting layer is formed on the glue layer on the surface of the other side. The adhesive layer of the diaphragm of the present invention can absorb and preserve the electrolyte, which is beneficial to the cycle life of the lithium-sulfur battery, and at the same time facilitates the attachment of other materials. The conductive layer can improve the utilization rate of the active material, and the lithium-ion conductive layer can reduce the polarization of the negative electrode. It reduces the diffusion of polysulfide ions to the negative electrode to cause side reactions, and can prevent the safety hazard caused by dendrites. Applying the multilayer composite structure separator to lithium-sulfur batteries can improve the cycle performance and safety performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery diaphragm and a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] The composition of a lithium-sulfur battery includes a positive electrode, a negative electrode, an electrolyte, and a separator. Among them, the negative electrode is generally made of lithium metal or lithium metal alloy, and lithium metal or lithium metal alloy can be made into a certain thickness of foil by rolling. , or a composite structure obtained by combining lithium with carbon materials or inorganic materials after melting; the positive electrode is generally formed of elemental sulfur or other electroactive sulfur materials, usually by combining sulfur or other sulfur-containing active materials with conductive materials and solvents, bonding After the agent is mixed to form a slurry, it is coated on the current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/463H01M50/403H01M10/0525H01M50/40H01M50/417
CPCH01M10/0525H01M50/403H01M50/431H01M50/446H01M50/411H01M50/463Y02E60/10
Inventor 潘跃德李俊义李素丽徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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