Diaphragm capable of improving sulfur content of positive electrode of lithium-sulfur battery, preparation method and application of diaphragm

A lithium-sulfur battery and sulfur content technology, applied in the application of lithium-sulfur batteries, the field of preparation of lithium-sulfur battery separators, can solve the problems of complex preparation process and process, unfavorable application, etc., and achieve the effect of inhibiting the shuttle effect

Active Publication Date: 2018-05-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these works, the preparation process and technology are generally very complicated, and the actual application is not used.

Method used

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  • Diaphragm capable of improving sulfur content of positive electrode of lithium-sulfur battery, preparation method and application of diaphragm
  • Diaphragm capable of improving sulfur content of positive electrode of lithium-sulfur battery, preparation method and application of diaphragm
  • Diaphragm capable of improving sulfur content of positive electrode of lithium-sulfur battery, preparation method and application of diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] The first step, preparation of carbon material-coated separator

[0029] The coating material and the binder PVD are dissolved in an appropriate amount of N-methylpyrrolidone (NMP) solvent according to the mass ratio of 8:2 and mixed uniformly to prepare a slurry; the slurry is coated on a commercial polypropylene diaphragm at 60°C Vacuum-dried for 12 hours, and punched into small discs with a diameter of 16 mm with a tablet press to obtain a carbon material-coated separator. The diaphragm is named Carbon Coated Diaphragm.

[0030] The coating material includes carbon black or other carbon materials, wherein the other carbon materials include graphite, carbon nanotubes, graphene and the like.

[0031] The second step is to prepare a separator with a dense membrane, that is, an SEI membrane.

[0032] The carbon material-coated separator prepared in the first step and the lithium sheet are used to form a button battery. The coated carbon layer is used as the positive el...

Embodiment example 2

[0044] The first step, preparation of carbon material-coated separator

[0045] The coating material and the binder PVD are dissolved in an appropriate amount of N-methylpyrrolidone (NMP) solvent according to the mass ratio of 7:3 and mixed uniformly to prepare a slurry; the slurry is coated on a commercial polypropylene diaphragm at 50°C Vacuum-dried for 24 hours, and punched into small discs with a diameter of 16 mm by a tablet press to obtain a carbon material-coated separator. The diaphragm is named Carbon Coated Diaphragm.

[0046] The coating material includes carbon black or other carbon materials, wherein the other carbon materials include graphite, carbon nanotubes, graphene and the like.

[0047] The second step is to prepare a separator with a dense membrane, that is, an SEI membrane.

[0048] The carbon material-coated separator prepared in the first step and the lithium sheet are used to form a button battery. The coated carbon layer is used as the positive elec...

Embodiment example 3

[0052] The first step, preparation of carbon material-coated separator

[0053] The coating material and the binder PVD are dissolved in an appropriate amount of N-methylpyrrolidone (NMP) solvent according to the mass ratio of 8:2 and mixed uniformly to prepare a slurry; the slurry is coated on a commercial polypropylene diaphragm, 55°C Vacuum-dried for 16 hours, and punched into small discs with a diameter of 16 mm with a tablet press to obtain a carbon material-coated separator. The diaphragm is named Carbon Coated Diaphragm.

[0054] The coating material includes carbon black or other carbon materials, wherein the other carbon materials include graphite, carbon nanotubes, graphene and the like.

[0055] The second step is to prepare a separator with a dense membrane, that is, an SEI membrane.

[0056] The carbon material-coated separator prepared in the first step and the lithium sheet are used to form a button battery. The coated carbon layer is used as the positive elec...

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PUM

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Abstract

The invention discloses a diaphragm capable of improving sulfur content of a positive electrode of a lithium-sulfur battery, a preparation method and an application of the diaphragm. The diaphragm substrate is a commercial polypropylene diaphragm, and coated with carbon black or other carbon material layer; a button battery is assembled by taking the coated carbon layer as a positive electrode andby taking a lithium sheet as a negative electrode; the button battery is subjected to cycles of 3-5 times in a voltage window of 1-0.3V to form a solid electrolyte membrane SEI on the coated carbon layer; and the SEI membrane and the coated carbon layer form a compact layer on the diaphragm to prevent shuttling of polysulfide to the negative electrode and to suppress a shuttling effect. The diaphragm capable of improving sulfur content of the positive electrode of the lithium-sulfur battery is applied to assembling of the lithium-sulfur battery. By virtue of the diaphragm provided by the invention, the sulfur content in the positive electrode of the lithium-sulfur battery can be effectively improved to 90%.

Description

technical field [0001] The invention belongs to the field of energy storage materials, and relates to a preparation method of a lithium-sulfur battery separator and its application in lithium-sulfur batteries. Background technique [0002] With the continuous development and progress of society, the energy density of lithium-ion batteries that have been widely used is not enough to meet the needs of many applications. Therefore, lithium-sulfur batteries with higher energy density have received extensive attention and research. However, there are many defects in lithium-sulfur batteries that restrict its application, such as: low sulfur utilization caused by low conductivity; weak cycle stability caused by the "shuttle effect" caused by the easy dissolution of intermediate polysulfides in the electrolyte . Researchers have invested a lot of energy to solve these problems, but one shortcoming has not received widespread attention-the content of sulfur in the positive electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/449H01M50/451H01M50/489
CPCH01M10/052H01M50/403H01M50/449Y02E60/10
Inventor 张凤祥郭峻岭赵淑鹏
Owner DALIAN UNIV OF TECH
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