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Modified diaphragm for lithium sulfur battery and preparation method of modified diaphragm

A technology for lithium-sulfur batteries and diaphragms, applied in the field of modified diaphragms for lithium-sulfur batteries and its preparation, can solve the problems of easy falling off, unstable battery performance, lack of crystal structure, etc., and achieve not easy falling off, excellent battery performance and mechanical properties high effect

Active Publication Date: 2019-09-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But if only NiCo 2 o 4 Coated on the surface of the separator, due to the lack of friction in contact with the separator due to its crystal structure, it is easy to fall off during the electrochemical reaction, resulting in unstable battery performance

Method used

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  • Modified diaphragm for lithium sulfur battery and preparation method of modified diaphragm
  • Modified diaphragm for lithium sulfur battery and preparation method of modified diaphragm
  • Modified diaphragm for lithium sulfur battery and preparation method of modified diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0039]A preparation method for a modified diaphragm for lithium-sulfur batteries, comprising the following steps:

[0040] Step 1: Disperse 40 mg of reduced graphene oxide (rGO) in 40 ml of deionized water, and ultrasonicate for 30 minutes to obtain a uniform graphene dispersion, namely solution A;

[0041] Step 2: Add 117mg of nickel nitrate hexahydrate, 233mg of cobalt nitrate hexahydrate, 141mg of hexamethylenetetramine, and 58mg of sodium citrate dihydrate into solution A. After ultrasonication for 50min, mix well and then oil bath Heat to 150°C and keep it warm for 6h to obtain solution B;

[0042] Step 3: After the solution B was suction-filtered and freeze-dried for 12 hours, the powder precursor was obtained. In the air atmosphere, it was heated to 500 °C, the heating rate was 1 °C / min, and the temperature was kept for 3 hours to prepare the powder NiCo 2 o 4 @rGO composites;

[0043] Step 4: NiCo prepared in step 3 2 o 4 @rGO composite materials are mixed with co...

Embodiment 2

[0046] A preparation method for a composite material for lithium-sulfur battery diaphragm coating, comprising the following steps:

[0047] Step 1: Disperse 40 mg of reduced graphene oxide (rGO) in 40 ml of deionized water, and ultrasonicate for 30 minutes to obtain a uniform graphene dispersion, namely solution A;

[0048] Step 2: Add 117mg of nickel nitrate hexahydrate, 233mg of cobalt nitrate hexahydrate, 141mg of hexamethylenetetramine, and 58mg of sodium citrate dihydrate into solution A. After ultrasonication for 50min, mix well and then oil bath Heat to 150°C and keep it warm for 6h to obtain solution B;

[0049] Step 3: After the solution B was suction-filtered and freeze-dried for 12 hours, the powder precursor was obtained. In the air atmosphere, heated to 500°C with a heating rate of 1°C / min and kept for 3 hours to obtain powder NiCo 2 o 4 @rGO composites;

[0050] Step 4: NiCo obtained by the above method 2 o 4 @rGO composite materials are mixed with conductiv...

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Abstract

The invention provides a modified diaphragm for a lithium sulfur battery and a preparation method of the modified diaphragm, and belongs to the technical field of energy materials. The preparation method comprises the following steps that a polar barrier layer is coated on a diaphragm matrix to prepare a novel diaphragm, wherein the polar barrier layer is an NiCo2O4@rGO composite material composedof flake-shaped reduced graphite oxide and polar cobalt oxide nano-particles, wherein the material has a three-dimensional porous structure, so that the specific surface area of the material is increased, the loading capacity of the sulfur powder is increased, and on the premise that the normal transmission of the lithium ions is not influenced, the shuttling of the polysulfide can be effectivelyblocked, the conductivity is improved, and the self polarity is kept while certain mechanical performance can be maintained; and the modified diaphragm can be stably and firmly in contact with a common diaphragm, is not easy to fall off in electrochemical reaction, is low in manufacturing cost and is suitable for large-scale production.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of energy materials, and in particular relates to a modified diaphragm for a lithium-sulfur battery and a preparation method thereof. Background technique [0003] Energy crisis and environmental pollution are two major problems in the development of the world today, and they are also one of the important factors restricting my country's economic development. With the advancement of science and technology, people have gradually transitioned from completely relying on fossil energy such as coal and oil to using clean energy such as solar energy and wind energy. However, renewable energy itself is unstable and uncontrollable, and the use of these energies needs to be matched with a suitable energy storage system. As a representative of energy storage systems, secondary batteries have become a research hotspot in energy materials. [0004] Lithium-sulfur battery as a new type of energy storage system, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M10/42
CPCH01M10/052H01M10/4235H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 熊杰吕晓雪雷天宇陈伟胡音李政翰张淼邬春阳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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