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Lithium-sulfur battery diaphragm and preparation method thereof as well as lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and diaphragm technology, applied in the field of diaphragm, can solve the problems of unstoppable dissolution and shuttle of polysulfide, loss of positive active material, and reduction of Coulombic efficiency of the system, so as to suppress the shuttle effect, reduce the resistance of the interface reaction, and improve the circulation performance effect

Active Publication Date: 2018-09-21
GREAT POWER BATTRY ZHUHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction system of lithium-sulfur batteries is very complicated. During the charging and discharging process, the lithium polysulfide intermediate product dissolves in the electrolyte, which will cause the loss of positive active materials and lead to battery capacity attenuation. At the same time, polysulfides will oxidize with metal lithium after reaching the negative electrode. Reduction reaction, forming a "shuttle effect", reducing the Coulombic efficiency of the system
However, in order to ensure a high lithium ion conductivity, the current commercial polyethylene or polypropylene separator has a relatively high porosity and a large pore diameter, while the diameter of polysulfide ions is less than 1nm, so the traditional separator is for Polysulfide ions basically have no blocking effect and cannot block the dissolution and shuttling of polysulfides

Method used

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  • Lithium-sulfur battery diaphragm and preparation method thereof as well as lithium-sulfur battery and preparation method thereof
  • Lithium-sulfur battery diaphragm and preparation method thereof as well as lithium-sulfur battery and preparation method thereof
  • Lithium-sulfur battery diaphragm and preparation method thereof as well as lithium-sulfur battery and preparation method thereof

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preparation example Construction

[0064] In a preferred embodiment of the present invention, the preparation method of nitrogen-doped porous carbon-carbon nanotube-graphene material includes the following steps:

[0065] The amine modified nanoporous carbon, the carboxylated graphene and the carboxylated carbon nanotube are mixed, and a condensation reaction is performed to obtain the nitrogen-doped porous carbon-carbon nanotube-graphene.

[0066] In a further preferred embodiment of the present invention, after mixing the amine modified nanoporous carbon, carboxylated graphene, and carboxylated carbon nanotubes, a condensation reaction activator is added to accelerate the condensation reaction process to obtain nitrogen-doped porous carbon-carbon Nanotube-Graphene.

[0067] In a preferred embodiment of the present invention,

[0068] In a further preferred embodiment of the present invention, the amine modified nanoporous carbon, carboxylated graphene and carboxylated carbon nanotubes are placed in a reaction flask, ...

Embodiment 1

[0110] This embodiment provides a lithium-sulfur battery separator, which is composed of a polypropylene porous film with a thickness of 25 μm as a supporting film and a nitrogen-doped carbon adsorption-conductive coating with a thickness of 5 μm. The preparation method includes the following steps:

[0111] Add nitrogen-doped porous carbon-carbon nanotube-graphene and polyvinylidene chloride binder to N-methylpyrrolidone at a mass ratio of 9:1 to make a slurry, and then coat the slurry on the surface of the support film After drying, a composite diaphragm for lithium-sulfur battery diaphragm is obtained.

[0112] Among them, the nitrogen-doped porous carbon-carbon nanotube-graphene is prepared according to the following steps:

[0113] The amine-modified nanoporous carbon, carboxylated single-layer graphene and carboxylated double-walled carbon nanotubes were dispersed in a toluene solution at a mass ratio of 1:2:1, and activated by adding DCC, and heated to 100°C and refluxed for 4...

Embodiment 2

[0120] This embodiment provides a lithium-sulfur battery diaphragm. The diaphragm is composed of a polyethylene porous film with a thickness of 25 μm as a support film and a nitrogen-doped carbon adsorption-conductive coating with a thickness of 10 μm. The preparation method is the same as that of Example 1. The same, the difference is that the nitrogen-doped porous carbon-carbon nanotube-graphene is made of amine-modified nanoporous carbon, carboxylated double-layer graphene, and carboxylated single-walled carbon nanotubes with a mass of 1:2:1. Among them, amine-modified nanoporous carbon uses Ketjen black and acetylene black (mass ratio 1:1) as the source of nanoporous carbon materials.

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Abstract

The invention provides a lithium-sulfur battery diaphragm and a preparation method thereof as well as a lithium-sulfur battery and a preparation method thereof and relates to the technical field of diaphragms. The lithium-sulfur battery diaphragm comprises a support membrane, and the support membrane is compounded with a nitrogen-doped carbon adsorption-conductive coating. The preparation method of the lithium-sulfur battery diaphragm comprises the following steps: coating the support membrane with the nitrogen-doped carbon adsorption-conductive coating, and drying the nitrogen-doped carbon adsorption-conductive coating to obtain the lithium-sulfur battery diaphragm. The lithium-sulfur battery diaphragm relieves the technical problems that a traditional diaphragm basically has no blockingeffect on multiple sulfur ions and can not block polysulfide dissolution and shuttling phenomena; and by compounding the nitrogen-doped carbon adsorption-conductive coating on the support membrane, the polysulfide can be adsorbed to the diaphragm to perform high-conductivity conversion, thereby inhibiting the shuttling effect of polysulfide, reducing the interface reaction resistance, effectivelyrecovering the dissolved sulfur at the interface between the anode and the diaphragm, increasing the utilization ratio of active substances of the anode, and limiting trans-membrane diffusion of polysulfide so as to enhance the cycle performance of the lithium-sulfur battery.

Description

Technical field [0001] The present invention relates to the technical field of separators, and in particular to a lithium-sulfur battery separator and a preparation method thereof, a lithium-sulfur battery and a preparation method thereof. Background technique [0002] With the increasing energy crisis and environmental pollution, rechargeable batteries with excellent performance have become one of the important means to solve the above problems. Lithium-ion batteries have the advantages of better cycle life, higher operating voltage, and less pollution, so lithium-ion batteries are increasingly used. However, issues such as low battery energy density, high battery cost, and battery safety limit the application of lithium-ion batteries in electric vehicles and large energy storage equipment. Research on high-performance batteries with high energy density, long cycle life, good safety, and low cost has become a top priority. In order to meet the needs of society, it is urge...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M10/0587C01B32/05H01M50/403H01M50/431H01M50/491H01M50/497
CPCH01M10/052H01M10/0587C01B32/05H01M50/431H01M50/403H01M50/411H01M50/449Y02E60/10Y02P70/50
Inventor 黄雪妍薛建军孟跃中肖敏王拴紧
Owner GREAT POWER BATTRY ZHUHAI
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