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Polymer@two-dimensional material modified layered double hydroxide composite diaphragm material as well as preparation method and application thereof

A layered bimetallic, two-dimensional material technology, used in secondary batteries, electrochemical generators, electrical components, etc., to avoid agglomeration, improve battery performance, and improve sulfur loading.

Active Publication Date: 2020-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the current research on diaphragm modification can improve the performance of lithium-sulfur batteries to a certain extent, it cannot fundamentally solve the problem of accumulation and migration of polysulfides in the electrolyte.

Method used

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  • Polymer@two-dimensional material modified layered double hydroxide composite diaphragm material as well as preparation method and application thereof
  • Polymer@two-dimensional material modified layered double hydroxide composite diaphragm material as well as preparation method and application thereof
  • Polymer@two-dimensional material modified layered double hydroxide composite diaphragm material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0077] A kind of preparation of molybdenum diselenide / MgAl hydrotalcite composite material of the present invention, it specifically comprises the following steps:

[0078] (1) Add 0.03mol magnesium nitrate, 0.015mol aluminum nitrate, 0.01mol sodium molybdate and 0.1mol sodium hydroxide to 100mL water, stir and react at 45°C for 1h; then raise the temperature to 85°C for 6h; crystallize After the end, centrifuge and wash, filter after 30 minutes of ultrasonic field action, disperse the filter cake in 50mL water to make hydrotalcite prepolymer suspension;

[0079] (2) Take 0.632g of selenium powder and 10mL of hydrazine hydrate in a three-necked flask and stir for 30min, add 40mL of the above-mentioned hydrotalcite prepolymer suspension and ultrasonically disperse it, then place it in a high-pressure reactor, and heat up at a rate of 5°C / Raise the temperature to 200°C under the condition of 1 min, keep the temperature for 720 minutes (when 360 minutes, take out the ultrasonic ...

Embodiment 2

[0088] A molybdenum diselenide / CoAl hydrotalcite composite material prepared by the present invention is used as a preparation method for forming a Li-S battery diaphragm, and its specific steps are as follows:

[0089] (1) Add 0.03mol cobalt nitrate, 0.015mol aluminum nitrate, 0.01mol sodium molybdate and 0.1mol sodium hydroxide to 100mL water, stir at 45°C for 1h, then heat up to 85°C for 6h crystallization, and the crystallization is complete Finally, centrifugal washing, ultrasonic 30min, the filter cake is dispersed in 50mL water to make hydrotalcite prepolymer suspension;

[0090] (2) Take 0.632g of selenium powder and 10mL of hydrazine hydrate in a three-necked flask and stir for 30min, add 40mL of the above hydrotalcite prepolymer suspension and ultrasonically disperse it, then raise the temperature to 200°C at a heating rate of 5°C / min , insulated for different times (half of the incubating time, take out the ultrasonic for 20 minutes, continue to incubate after the e...

Embodiment 3

[0126] The preparation method is similar to that of Example 2, except that the hydrothermal reduction temperature of the CoAl hydrotalcite composite material is increased from 200° C. to 250° C.; the molybdenum diselenide / CoAl hydrotalcite composite material H is prepared.

[0127] The battery preparation and electrochemical performance test were carried out on the obtained material H, and the test conditions were the same as in Example 2.

[0128] The test results show that the initial discharge capacity is 1237mAh g at 0.1C -1 , compared to 1030mAh g of the PP separator alone -1 , boosted by 207mAh g -1 ;After 50 cycles, the PP@composite material H diaphragm battery maintains 567mAh g -1 Reversible capacity, compared to 470mAh g of PP diaphragm battery -1 increased.

[0129] From Comparative Example 5, Example 2 and Example 3, it can be seen that the hydrothermal reduction temperature of the composite material has a significant impact on the activity of the separator and...

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Abstract

The invention belongs to the field of battery materials, and particularly discloses a polymer@two-dimensional material modified layered double hydroxide composite diaphragm material which comprises apolymer material and an active material compounded in the polymer film material, wherein the active material is the two-dimensional material modified layered double hydroxides and comprises layered double hydroxides and a two-dimensional material growing on the surfaces of the layered double hydroxides in situ; the two-dimensional material is at least one of molybdenum diselenide, tungsten diselenide, molybdenum disulfide and tungsten disulfide. The invention also provides preparation of the diaphragm and application of the diaphragm in a lithium-sulfur battery. The material is advantaged in that the brand-new material provided by the invention can effectively solve the boundary effect of a two-dimensional material, can open more active sites, avoids agglomeration, and can unexpectedly improve the performance of the battery diaphragm by adding the brand-new material into the battery diaphragm, for example, the sulfur loading capacity and the catalytic degradability to polysulfide compounds are improved, and the performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a polymer@two-dimensional material modified layered double metal hydroxide composite diaphragm material for lithium-sulfur batteries. Background technique [0002] It is more and more important and valuable to develop a new generation of secondary battery system that is environmentally friendly and has high energy density and long cycle life. In recent years, lithium-sulfur battery has been paid more and more attention as a new type of lithium battery. It has a theoretical specific capacity as high as 1675mAH g-1, and a theoretical specific energy as high as 2500WhKg-1; Inexpensive. However, there are some problems with lithium-sulfur batteries at this stage, which prevents them from being widely used in people's daily life. One of the more serious problems is the "shuttle effect" of lithium-sulfur batteries. Lithium-sulfur battery separator can prevent internal short circuit of the b...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 曹占芳钟宏王帅
Owner CENT SOUTH UNIV
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