Ti3C2Tx/PVDF (polyvinylidene fluoride)/Celgard composite membrane

A composite diaphragm and diaphragm technology, applied in electrical components, circuits, battery pack components, etc., can solve the problems of reducing the utilization rate of sulfur active materials, slow migration speed, safety problems of lithium-sulfur batteries, etc., to reduce the shuttle effect, Life-enhancing effect

Inactive Publication Date: 2017-06-20
SHENZHEN PEICHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon, known as the shuttle effect, reduces the availability of sulfur active species
At the same time insoluble Li 2 S and Li 2 S 2 Deposited on the surface of the lithium negative electrode, which further deteriorates the performance of the lithium-sulfur battery; (3) the final product of the reaction, Li 2 S is also an electronic insulator and will be deposited on the sulfur electrode, while lithium ions migrate slowly in solid lithium sulfide, slowing down the electrochemical reaction kinetics; (4) sulfur and the final product Li 2 The density of S is different. When sulfur is lithiated, the volume expands by about 79%, which easily leads to Li 2 Pulverization of S, causing safety problems in lithium-sulfur batteries
The above deficiencies restrict the development of lithium-sulfur batteries, which is also a key issue that needs to be solved in current research on lithium-sulfur batteries.

Method used

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  • Ti3C2Tx/PVDF (polyvinylidene fluoride)/Celgard composite membrane
  • Ti3C2Tx/PVDF (polyvinylidene fluoride)/Celgard composite membrane
  • Ti3C2Tx/PVDF (polyvinylidene fluoride)/Celgard composite membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Put Ti 3 AlC 2 The ceramic powder was corroded in hydrofluoric acid with a mass concentration of 20% for 24 hours. After corrosion, the solution was added to deionized water for centrifugation, and then the precipitate was dried to obtain stacked layered Ti. 3 C 2 T x Powder;

[0019] (2) Add 1g of PVDF to 100g of N-methylpyrrolidone, stir for 1 hour to dissolve, and form a PVDF solution;

[0020] (3) Add 100g Ti 3 C 2 T x The powder is added to the PVDF solution and stirred mechanically for 12 hours to make it evenly mixed to form a slurry, and then the slurry is coated on the Celgard diaphragm and dried in vacuum to obtain Ti 3 C 2 T x / PVDF / Celgard composite diaphragm.

Embodiment 2

[0022] (1) Put Ti 3 AlC 2 The ceramic powder was corroded in hydrofluoric acid with a mass concentration of 50% for 4 hours. After corrosion, the solution was added to deionized water for centrifugation, and then the precipitate was dried to obtain stacked layered Ti. 3 C 2 T x Powder;

[0023] (2) Add 1g of PVDF to 10g of N-methylpyrrolidone and stir for 12 hours to dissolve it to form a PVDF solution;

[0024] (3) Add 10gTi 3 C 2 T x The powder is added to the PVDF solution and mechanically stirred for 1 hour to make it evenly mixed to form a slurry, and then the slurry is coated on the Celgard diaphragm, and after vacuum drying, Ti 3 C 2 T x / PVDF / Celgard composite diaphragm.

Embodiment 3

[0026] (1) Put Ti 3 AlC 2 The ceramic powder was corroded in hydrofluoric acid with a mass concentration of 30% for 20 hours. After corrosion, the solution was added to deionized water for centrifugation, and then the precipitate was dried to obtain stacked layered Ti. 3 C 2 T x Powder;

[0027] (2) Add 1g of PVDF to 50g of N-methylpyrrolidone, stir for 6 hours to dissolve, and form a PVDF solution;

[0028] (3) Add 50gTi 3 C 2 T x The powder was added to the PVDF solution and mechanically stirred for 6 hours to make it evenly mixed to form a slurry, which was then coated on the Celgard diaphragm and dried in vacuum to obtain Ti 3 C 2 T x / PVDF / Celgard composite diaphragm.

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Abstract

The invention provides a Ti3C2Tx / PVDF (polyvinylidene fluoride) / Celgard composite membrane which comprises a commercial Celgard membrane and a Ti3C2Tx / PVDF layer on the surface of the commercial Celgard membrane, wherein the thickness of the Ti3C2Tx / PVDF layer is 1 to 10 mu m; the mass ratio of Ti3C2Tx to PVDF in the Ti3C2Tx / PVDF layer is 1 to (0.01 to 0.1). T on the Ti3C2Tx is an -F group or an -OH group, and any of the -F group and the -OH group is a strong-polar group and can generate strong chemical adsorption for polysulfides produced in charge and discharge processes and effectively prevent the polysulfides from penetrating through the membrane and reaching a negative electrode, thus reducing occurrence of the shuttle flying effect and prolonging the service life of a lithium-sulfur battery.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery diaphragm. Background technique [0002] A lithium-sulfur battery is a battery system in which metallic lithium is used as the negative electrode and elemental sulfur is used as the positive electrode. Lithium-sulfur batteries have two discharge platforms (about 2.4 V and 2.1 V), but their electrochemical reaction mechanism is relatively complicated. Lithium-sulfur batteries have the advantages of high specific energy (2600 Wh / kg), high specific capacity (1675 mAh / g), and low cost, and are considered to be a promising new generation of batteries. However, at present, there are problems such as low utilization of active materials, low cycle life and poor safety, which seriously restrict the development of lithium-sulfur batteries. The main reasons for the above problems are as follows: (1) elemental sulfur is an electronic and ion insulator, and i...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/434H01M50/443H01M50/446H01M50/449
CPCH01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 钟玲珑
Owner SHENZHEN PEICHENG TECH CO LTD
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