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Lithium-sulfur battery separator membrane as well as preparation method and application thereof

A lithium-sulfur battery and diaphragm technology, applied in the field of lithium-sulfur battery diaphragm and its preparation, can solve the problems of the electronic conductivity and capacity retention of the diaphragm that need to be further improved, and achieve the goals of suppressing the shuttle effect, good rate performance, and improving conductivity Effect

Active Publication Date: 2019-11-22
安徽金力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, when the functional coating of this application or other existing functional coatings is applied on the surface of the separator, the electronic conductivity and capacity retention of the obtained separator still need to be further improved.

Method used

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  • Lithium-sulfur battery separator membrane as well as preparation method and application thereof
  • Lithium-sulfur battery separator membrane as well as preparation method and application thereof
  • Lithium-sulfur battery separator membrane as well as preparation method and application thereof

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preparation example Construction

[0042] The preparation method of the above-mentioned lithium-sulfur battery diaphragm of the present invention comprises the following steps:

[0043] Step 1. Disperse the conductive carbon material and dispersant in the solvent, and ultrasonically treat it for 1-2 hours to obtain a conductive carbon material dispersion. The concentration of the dispersion, that is, the mass percentage of the conductive carbon material in the dispersion is 5‰-5%. The amount of dispersant added is 0.1-5% of the weight of the conductive carbon material;

[0044] Step 2. Disperse the nanocellulose and dispersant in the solvent, and mechanically stir for 1.5-2.5 hours to obtain a nanocellulose dispersion. The concentration of the dispersion, that is, the mass percentage of the nanocellulose in the dispersion is 4%-10%. , the amount of dispersant added is 0.1-5% of the mass of nanocellulose;

[0045] Step 3, disperse the sulfide and dispersant in the solvent, mechanically stir (rotating speed is c...

Embodiment 1

[0050] A separator for a lithium-sulfur battery in this embodiment includes a separator base film and a functional layer coated on both sides of the base film, the components of the functional layer include functional materials and additives, and the functional material includes a layered structure Sulfides, conductive carbon materials, and nanocellulose. Specifically, the layered structure sulfide of this embodiment is molybdenum disulfide (MoS 2 ), its addition is 20% of the total weight of the functional structural layer (slurry); the conductive carbon material is conductive graphene, and its addition is 5% of the functional structural layer gross weight; nanocellulose is carboxymethyl nanocellulose , and its added amount is 8% of the total weight of the functional structure layer.

[0051] The additives in this embodiment include dispersants, binders, surfactants and lithium ion additives, wherein the dispersant is polyvinylpyrrolidone, and its added amount is 10% of the ...

Embodiment 2

[0069] A separator for a lithium-sulfur battery in this embodiment includes a separator base film and a functional layer coated on both sides of the base film, the components of the functional layer include functional materials and additives, and the functional material includes a layered structure Sulfides, conductive carbon materials, and nanocellulose. Specifically, the layered structure sulfide of this embodiment is molybdenum disulfide (MoS 2 ), its addition is 35% of the total weight of the functional structure layer; the conductive carbon material is conductive carbon black, and its addition is 5% of the total weight of the functional structure layer; nanocellulose is nano ceramic fiber, and its addition is the functional structure 5% of the total layer weight.

[0070] The additives in this embodiment include dispersants, binders, surfactants and lithium ion additives, wherein the dispersants are alkyl sulfonates, and the added amount is 5% of the total weight of the ...

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Abstract

The invention discloses a lithium-sulfur battery separator membrane as well as a preparation method and application thereof, and belongs to the technical field of battery separator membranes. The lithium-sulfur battery separator membrane comprises a base membrane and a functional layer with which the base membrane is coated, wherein the functional layer comprises a functional material and an auxiliary agent, and the functional material comprises a layered sulfide, a conductive carbon material and nano cellulose. By adopting the technical scheme provided by the invention, the shuttle effect caused by lithium polysulfide in the cycle process of the lithium-sulfur battery can be effectively inhibited, and the capacity retention ratio, the electronic conductivity and the cycle effect of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and more specifically relates to a lithium-sulfur battery diaphragm and its preparation method and application. Background technique [0002] Electrochemical storage systems are the basis of global energy policy. With the continuous growth of the world's energy demand and the increasingly serious environmental problems, people are paying more and more attention to energy devices that can meet the energy demand. The current commercial lithium-ion battery (LIB) and lead-acid battery can meet the current demand in terms of energy, but there are great challenges regarding the long-term feasibility of using lithium-based batteries as the main power source of electric vehicles. In recent years, the development of lithium-sulfur batteries (LIS) has attracted extensive attention from industry researchers. [0003] Since the theoretical specific capacity of the elemental sulfur cathode materia...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/446H01M50/449
CPCH01M10/052H01M50/411H01M50/44H01M50/431H01M50/403Y02E60/10
Inventor 王娟张杰王杰盖小厂晋沛沛庞冲陈旭梁海燕穆红彦
Owner 安徽金力新能源有限公司
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