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Modified diaphragm for lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and modification technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of sulfur positive electrode volume change, large polarization resistance, and low utilization rate of positive electrode materials, so as to promote Transmission, the effect of reducing interface resistance

Inactive Publication Date: 2020-12-08
广州市豪越新能源设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current lithium-sulfur batteries still have some fatal shortcomings: ① low conductivity of sulfur and discharge products, resulting in low utilization of active materials and large polarization resistance; ② intermediate products in the charging and discharging process are dissolved in the electrolyte, and Shuttle between the positive and negative electrodes, resulting in low utilization of the positive electrode material and low cycle life; ③The sulfur positive electrode will undergo a large volume change during charging and discharging
At present, lithium-sulfur battery separators are usually non-polar films such as polypropylene and polyethylene (PP / PE), which cannot prevent polyoxides dissolved in the electrolyte from shuttling between the positive and negative electrodes.
Most of the composite separators currently researched and developed are based on the principle of physical and / or chemical adsorption to limit the shuttle of polysulfide ions during charge and discharge, which has limited effect on improving the overall performance of the battery.

Method used

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  • Modified diaphragm for lithium-sulfur battery and preparation method thereof
  • Modified diaphragm for lithium-sulfur battery and preparation method thereof

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Embodiment 1

[0036] The present invention also provides a preparation method of the modified diaphragm for the lithium-sulfur battery, comprising the following steps:

[0037] (1) Preparation of porous carbon materials:

[0038] Clean 10 g of melamine sponge with absolute ethanol and deionized water, after drying, carbonize the melamine sponge at 500° C. for 6 hours under a nitrogen protective atmosphere, and obtain a carbon sponge after cooling;

[0039] (2) Preparation of porous graphene oxide:

[0040] Graphene oxide was ultrasonically dispersed in a 10M sodium hydroxide solution, and then refluxed at 100°C for 10 hours; the obtained samples were washed with absolute ethanol and deionized water, filtered three times, and then dried;

[0041] (3) Preparation of titanium cobalt oxide / porous graphene / porous carbon composite material:

[0042] A 2mol / L mixed solution of titanium salt and cobalt salt was prepared, the titanium salt was titanium tetrachloride, the cobalt salt was cobalt ace...

Embodiment 2

[0048] The present invention also provides a preparation method of the modified diaphragm for the lithium-sulfur battery, comprising the following steps:

[0049] (1) Preparation of porous carbon materials:

[0050] Clean 10 g of melamine sponge with absolute ethanol and deionized water, after drying, carbonize the melamine sponge at 500° C. for 6 hours under a nitrogen protective atmosphere, and obtain a carbon sponge after cooling;

[0051] (2) Preparation of porous graphene oxide:

[0052] Graphene oxide was ultrasonically dispersed in a 15M sodium hydroxide solution, and then refluxed at 100°C for 10 hours; the obtained samples were washed with absolute ethanol and deionized water, filtered three times, and then dried;

[0053] (3) Preparation of titanium cobalt oxide / porous graphene / porous carbon composite material:

[0054] A 2mol / L mixed solution of titanium salt and cobalt salt was prepared, the titanium salt was titanium tetrachloride, the cobalt salt was cobalt ace...

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Abstract

The invention relates to a modified diaphragm for a lithium-sulfur battery, and belongs to the technical field of electrochemical energy storage. The middle-layer composite material disclosed by the invention has rich porous structures, and comprises porous graphene and a skeleton with a porous sponge structure, so that an ion transmission path is prevented from being hindered due to lamellar structures such as graphene in the prior art. Through an in-situ reaction, cobalt titanium oxide is produced in a porous structure of a porous skeleton, and the uniformly dispersed oxide nanocrystals provide a large number of lithium polyoxide adsorption sites. Sulfonated polyether-ether-ketone is introduced, the interface resistance of the electrode is reduced, and electronegative groups can repel electronegative polysulfide ion transmission, so that shuttling of lithium polyoxide is blocked. The present application achieves a lithium-sulfur secondary battery having high cycle stability.

Description

technical field [0001] The application relates to a preparation method of a modified diaphragm for lithium-sulfur batteries and a preparation method of an intermediate layer material, belonging to the field of battery materials. Background technique [0002] In 1992, Sony Corporation of Japan successfully realized the commercial application of lithium-ion batteries, and then lithium-ion batteries developed rapidly. However, the theoretical specific capacity and energy density of lithium-ion batteries limit its further development, so it is urgent to develop new electrochemical energy storage devices with high energy density, long cycle life, and low cost. Lithium-sulfur batteries have the advantages of high theoretical specific capacity, high energy density, and abundant resources, and have strong competitiveness in many new-generation energy storage systems. However, the current lithium-sulfur batteries still have some fatal shortcomings: ① low conductivity of sulfur and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052
CPCH01M10/052Y02E60/10
Inventor 张燕
Owner 广州市豪越新能源设备有限公司
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