Ion-selectivity composite membrane as well as preparation method and application thereof

An ion-selective, composite diaphragm technology, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of hindering the commercialization of lithium-sulfur batteries, irreversible capacity loss, low coulomb efficiency, etc., and is conducive to large-scale production. , avoid the shuttle effect, improve the effect of migration number

Active Publication Date: 2019-04-09
SUZHOU DISIFU NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still several technical defects that need to be overcome urgently: (1) large volume expansion of about 80% during charge and discharge; (2) S and its discharge product Li 2 The electronic conductivity of S is poor (5×10 -30 S cm -1 ); (3) The reaction of lithium-sulfur battery belongs to the dissolution-deposition reaction, and the intermediate product polysulfide (Li 2 S n , 4≤n≤8) dissolve in the electrolyte, and then shuttle to the negative electrode, and cause side reactions with lithium metal to cause irreversible capacity loss and low Coulombic efficiency. During the charging process, partially reduced polysulfide ions shuttle back to the positive electrode, resulting in over charging phenomenon
(4) As a battery system with metal lithium as the negative electrode, it is inevitable to face problems such as dendrite growth and low Coulombic efficiency caused by the metal lithium negative electrode, among which the safety hazard caused by dendrite growth is the main problem
Among the above four main technical problems, (3) and (4) are the main problems hindering the commercialization of lithium-sulfur batteries

Method used

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  • Ion-selectivity composite membrane as well as preparation method and application thereof
  • Ion-selectivity composite membrane as well as preparation method and application thereof
  • Ion-selectivity composite membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of ion-selective composite diaphragm and lithium-sulfur battery

[0040] A kind of ion-selective composite diaphragm, comprises the sodium carboxymethyl cellulose (CMC) coating that is coated on diaphragm positive pole side, is coated on the Al of diaphragm negative pole side 2 o 3 The coating and the polymer porous layer in the middle, the thickness of the polymer porous layer is 12 μm, the thickness of the CMC coating is 10 μm, Al 2 o 3 The thickness of the coating was 4 μm.

[0041] The preparation method of described ion-selective composite diaphragm is as follows:

[0042] A. Select single-sided Al prepared by industrial coating method 2 o 3 a diaphragm with a polymer layer on the other side;

[0043] B. Dissolve CMC in H 2 In the mixed solvent of O and organic solvent, stir 12h, make CMC be uniformly dispersed in solvent;

[0044] C. Transfer the uniformly dispersed CMC glue solution to the diaphragm of the film-coated plate, and app...

Embodiment 2

[0054] Example 2: Preparation of ion-selective composite diaphragm and lithium-sulfur battery

[0055] A kind of ion-selective composite diaphragm, comprises the sodium carboxymethyl cellulose (CMC) coating that is coated on diaphragm positive electrode side, is positioned at the Al of negative electrode side 2 o 3 The coating and the polymer porous layer in the middle, the thickness of the polymer porous layer is 12 μm, the thickness of the CMC coating is 2 μm, Al 2 o 3 The thickness of the coating was 4 μm.

[0056] The preparation method of described ion-selective composite diaphragm is as follows:

[0057] A. Select single-sided Al prepared by industrial coating method 2 o 3 a diaphragm with a polymer layer on the other side;

[0058] B. Sodium carboxymethyl cellulose (CMC) was dissolved in H 2 Mixed solvent of O and organic solvent, stir 12h, make CMC evenly disperse in solvent;

[0059] C. Transfer the uniformly dispersed CMC glue solution to the diaphragm of the...

Embodiment 3

[0069] A kind of ion-selective composite diaphragm, comprises the sodium carboxymethyl cellulose (CMC) coating that is coated on diaphragm positive pole side, is coated on the Al of negative pole side 2 o 3 The coating and the polymer porous layer in the middle, the thickness of the polymer porous layer is 12 μm, the thickness of the CMC coating is 2 μm, Al 2 o 3 The thickness of the coating was 4 μm.

[0070] The preparation method of described ion-selective composite diaphragm is as follows:

[0071] A. Select single-sided Al prepared by industrial coating method 2 o 3 a diaphragm with a polymer layer on the other side;

[0072] B. Sodium carboxymethyl cellulose (CMC) was dissolved in H 2 Mixed solvent of O and organic solvent, stir 12h, make CMC evenly disperse in solvent;

[0073] C. Transfer the uniformly dispersed CMC glue solution to the diaphragm of the film-coated plate, and use the scraper method to coat the composite diaphragm with a uniform coating, and cont...

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Abstract

The invention discloses an ion-selectivity composite membrane. The ion-selectivity composite membrane comprises a polymer porous layer, a sodium carboxymethyl cellulose coating and an inorganic ceramic coating, wherein the sodium carboxymethyl cellulose coating and the inorganic ceramic coating are separately coated on the two sides of the polymer porous layer. The invention also provides a preparation method of the ion-selectivity composite membrane and application of the ion-selectivity composite membrane to lithium batteries. According to the ion-selectivity composite membrane disclosed bythe invention, shuttling of polysulfide ions and production of lithium dendrite can be effectively inhibited.

Description

technical field [0001] The invention relates to the technical field of battery diaphragms, in particular to an ion-selective composite diaphragm, its preparation method and application. Background technique [0002] Compared with the memory of electronic products, which can double every 18 months, the highest actual energy density of commercial lithium-ion batteries is about 240Wh kg -1 , only compared with the first-generation lead-acid battery (40Wh·kg -1 ) is 5 times higher. In this context, especially the promotion of electric vehicles, small electronic equipment and other products, due to the inherent theoretical upper limit of the original battery system, there is an urgent need for the development of a new battery system with high energy density. Lithium-sulfur batteries are an ideal candidate for next-generation batteries consisting of S cathodes and Li anodes. Its theoretical energy density is as high as 2600Wh·kg -1 , and environmentally friendly, low cost. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/434H01M50/446H01M50/449
CPCH01M10/0525H01M50/4295H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 何平王鹏飞周豪慎
Owner SUZHOU DISIFU NEW ENERGY TECH CO LTD
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