Battery diaphragm and preparation method thereof, and lithium-sulfur battery

A technology of battery diaphragm and diaphragm, which is applied to battery components, circuits, electrical components, etc., and can solve problems such as polysulfide shuttle effect

Pending Publication Date: 2020-12-22
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of the polysulfide shuttle effect existing in the diaphragm of the existing lithium-sulf

Method used

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  • Battery diaphragm and preparation method thereof, and lithium-sulfur battery
  • Battery diaphragm and preparation method thereof, and lithium-sulfur battery
  • Battery diaphragm and preparation method thereof, and lithium-sulfur battery

Examples

Experimental program
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Effect test

preparation example Construction

[0074] In another aspect, the present invention provides a method for preparing a battery separator as described above, comprising the following steps:

[0075] obtaining porous carbon materials;

[0076] Disperse the porous carbon material in a dispersing solvent, add a metal source and a sulfur source, perform a hydrothermal reaction, form a metal sulfide inside the pore body of the porous carbon material, filter, and dry to obtain a composite material;

[0077] The above composite material is covered on the surface of the separator matrix, and dried to form a battery separator.

[0078] In some embodiments, the method for obtaining the porous carbon material is:

[0079] Mix the large mesh resin with the metal ion salt solution, stir and then dry to obtain the resin that adsorbs metal ions;

[0080] Pulverizing the resin adsorbing metal ions, then adding a transitional cavity filler and mixing evenly;

[0081] Add the product obtained above into the pore-enlarging agent ...

Embodiment example 1

[0115] This implementation case is used to illustrate the battery separator, lithium-sulfur battery and its preparation method disclosed in the present invention, including the following steps:

[0116] The porous carbon material prepared in the above example was ultrasonically dispersed in 2mol / L sodium hydroxide, then placed in a high-pressure hydrothermal kettle, and subjected to a hydrothermal reaction at 180 degrees Celsius for 2 hours, and then the obtained substance was suction-filtered with double-distilled water Wash until the pH is 7, and dry in an oven.

[0117] Take out 100 mg of functionalized porous carbon material, disperse it in ethylene glycol solution, ultrasonicate for half an hour, add cobalt acetate and thiourea in turn, conduct hydrothermal reaction at 120 degrees Celsius respectively, keep it warm for 10 hours, and heat it at 220 degrees Celsius for 10 hours. The obtained substance was washed four times with double distilled water and ethanol suction fil...

Embodiment example 2

[0124] This implementation case is used to illustrate the battery separator, lithium-sulfur battery and its preparation method disclosed in the present invention, including most of the operation steps in the implementation case 1, and the difference lies in:

[0125] The porous carbon material prepared in the above examples was ultrasonically dispersed in 2mol / L sulfuric acid, then placed in a high-pressure hydrothermal kettle, and subjected to a hydrothermal reaction at 180 degrees Celsius for 2 hours, and then the obtained substance was filtered and cleaned with double distilled water until PH is 7, put it in an oven for drying.

[0126] The obtained lithium-sulfur battery positive electrode has a specific capacity of 1000mAh / g and 900mAh / g for the first and second discharges at a current density of 0.1C, and the specific capacity is stable at 750mAh / g after 100 cycles. After 200 cycles, the specific capacity Stable at 600mAh / g.

[0127] The performance of the lithium-sulfu...

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Abstract

In order to overcome the problem that a polysulfide shuttle effect exists in a diaphragm of an existing lithium-sulfur battery, the invention provides a battery diaphragm which comprises a diaphragm matrix and a covering layer covering the diaphragm matrix, the covering layer comprises a porous carbon material and metal sulfide loaded on the porous carbon material, and the metal sulfide is dispersed in the porous body of the porous carbon material. Meanwhile, the invention also discloses a preparation method of the battery diaphragm and a lithium-sulfur battery. The battery diaphragm providedby the invention can effectively block shuttling of polysulfide and greatly improve the cycle performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery diaphragm, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] With the development of society, energy depletion and environmental pollution are great challenges facing mankind, so the development of clean energy has received unprecedented attention. Due to its good cycle performance, less pollution and no memory effect, lithium batteries have become widely used energy storage devices this year. However, the existing lithium-ion battery is approaching its energy density limit. At the same time, many fields such as new energy vehicles, portable storage, and energy storage power stations have put forward higher energy density application requirements for energy storage devices. Therefore, higher energy density and safety are sought. The next-generation energy storage device has become an urgent need. [0003] Due to it...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18H01M2/14
Inventor 胡倩倩洪晔吴春宇董海勇长世勇胡志鹏
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD
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