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Functional diaphragm for lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and functional technology, which is applied in the field of functional diaphragms for lithium-sulfur batteries and its preparation, can solve problems such as the inability to suppress the shuttle effect, achieve the goal of avoiding the shuttle effect, increasing the number of lithium ion migration, and improving ion conductivity Effect

Inactive Publication Date: 2020-08-11
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a preparation method of a functional diaphragm for lithium-sulfur batteries, which can solve the defect that the traditional battery diaphragm cannot suppress the shuttle effect and improve the ion conductivity and rate performance of the diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a functional separator for a lithium-sulfur battery, comprising: coating the first slurry on the positive electrode side of a base film, drying at 70°C for 0.5 min, forming a first coating with a thickness of 2 μm on the base film, and then The second slurry was coated on the first coating, and dried at 70° C. for 0.5 min to obtain a second coating with a thickness of 2 μm on the first coating, wherein the base film was a polyethylene film.

[0031] The first slurry is composed of a solvent, a dispersant, a carbon conductor and a binder. The method for preparing the first slurry is: add a dispersant to the solvent, stir in a mixer for 20 minutes until uniform, and then add a carbon conductor and a binder. The mixture of the binder is stirred in a mixer for 20min to be uniform, and sanded in a sand mill for 20min to obtain the first slurry, wherein the solvent is a mixture of water and alcohol, and in parts by mass, the amount of water and alcohol i...

Embodiment 2

[0035] A method for preparing a functional separator for a lithium-sulfur battery, comprising: coating the first slurry on the positive electrode side of a base film, drying at 70°C for 0.6 min, and forming a first coating with a thickness of 2.5 μm on the base film, Then coat the second slurry on the first coating and dry at 70° C. for 0.6 min to obtain a second coating with a thickness of 2 μm on the first coating, wherein the base film is a polyethylene film.

[0036] The first slurry is composed of a solvent, a dispersant, a carbon conductor and a binder. The method for preparing the first slurry is: add a dispersant to the solvent, stir in a mixer for 30 minutes until uniform, and then add a carbon conductor and a binder. The mixture of the binder is stirred in a mixer for 30min to be uniform, and sanded for 36min in a sand mill to obtain the first slurry, wherein the solvent is a mixture of water and alcohol, and in parts by mass, the amount of water and alcohol in the so...

Embodiment 3

[0039] A method for preparing a functional separator for a lithium-sulfur battery, comprising: coating the first slurry on the positive electrode side of a base film, drying at 70°C for 0.7min, forming a first coating with a thickness of 3 μm on the base film, and then The second slurry was coated on the first coating, and dried at 70° C. for 0.7 min to obtain a second coating with a thickness of 2 μm on the first coating, wherein the base film was a polypropylene film.

[0040]The first slurry is composed of a solvent, a dispersant, a carbon conductor and a binder. The method for preparing the first slurry is: add a dispersant to the solvent, stir in a mixer for 40 minutes until uniform, and then add a carbon conductor and a binder. The mixture of the binder is stirred in a mixer for 40min to be uniform, and sanded for 40min in a sand mill to obtain the first slurry, wherein the solvent is a mixture of water and alcohol, and in parts by mass, the amount of water and alcohol in...

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Abstract

The invention discloses a functional diaphragm for a lithium-sulfur battery and a preparation method thereof. The preparation method comprises the following steps of coating first slurry on the positive electrode side of a base film, drying to form a first coating on the base film, coating the first coating with second slurry, drying, and obtaining a second coating on the first coating, the firstslurry being composed of solvent, dispersing agent, a carbon conductor and a binder, the second slurry being composed of organic polymer, pore forming agent and water, and the organic polymer is water-soluble phenolic resin. The preparation method is advantaged in that by introducing the functional layer to a surface of a polyolefin diaphragm, on one hand, generation of polysulfide is prevented, and the shuttle effect is avoided; on the other hand, ionic conductivity of the diaphragm can be improved, the lithium ion transference number of the diaphragm is increased, and battery polarization isreduced so that the rate capability of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery separators, and in particular relates to a functional separator for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] Traditional lithium battery cathode materials are limited to 200-250Wh.kg -1 The energy density of the battery is far from meeting the energy density requirements of the electric vehicle and large-scale energy storage equipment industries. As early as the end of the 1960s, elemental sulfur was proposed to be used as a cathode material for lithium-ion batteries, and then research on lithium-sulfur batteries began. The theoretical specific energy and theoretical energy density of the lithium-sulfur battery system can reach 2600Wh.kg -1 and 2800Wh.L -1 . In addition, lithium-sulfur batteries have also promoted the rapid growth of the market due to their abundant and easy-to-obtain raw materials and low cost. However, lithium-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/414H01M50/431H01M50/449H01M50/497
CPCH01M50/403H01M50/446Y02E60/10
Inventor 袁海朝徐锋苏柳苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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