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Ti3C2Tx/Nafion/Celgard composite diaphragm

A composite diaphragm and diaphragm technology, which is applied in the repair/maintenance of secondary batteries, gas removal of secondary batteries, electrical components, etc., can solve the problem of reducing the utilization rate of sulfur active substances, slow migration, and slow electrochemical reaction kinetics. and other problems to achieve the effect of reducing the shuttle effect and improving the lifespan

Inactive Publication Date: 2017-08-04
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/Nafion/Celgard composite diaphragm
  • Ti3C2Tx/Nafion/Celgard composite diaphragm
  • Ti3C2Tx/Nafion/Celgard composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (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;

[0017] (2) Add 0.025gTi 3 C 2 T x The powder was added to 10 g of Nafion solution with a mass fraction of 5% for ultrasonic dispersion, and the ultrasonic time was 1 hour to form a suspension, which was then coated on a Celgard diaphragm and dried in vacuum to obtain Ti 3 C 2 T x / Nafion / Celgard composite diaphragm.

Embodiment 2

[0019] (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;

[0020] (2) Add 0.25gTi 3 C 2 T x The powder was added to 10 g of Nafion solution with a mass fraction of 5% for ultrasonic dispersion, and the ultrasonic time was 5 hours to form a suspension, which was then coated on a Celgard diaphragm and dried in vacuum to obtain Ti 3 C 2 T x / Nafion / Celgard composite diaphragm.

Embodiment 3

[0022] (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;

[0023] (2) Add 0.05gTi 3 C 2 T x The powder was added to 10g of Nafion solution with a mass fraction of 5% for ultrasonic dispersion, and the ultrasonic time was 2 hours to form a suspension, which was then coated on a Celgard diaphragm and dried in vacuum to obtain Ti 3 C 2 T x / Nafion / Celgard composite diaphragm.

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Abstract

The invention provides a Ti3C2Tx / Nafion / Celgard composite diaphragm. The composite diaphragm comprises a Celgard diaphragm and a Ti3C2Tx / Nafion layer on the surface of the Celgard diaphragm, wherein the thickness of the Ti3C2Tx / Nafion layer is 1-10 microns, and the mass ratio of Ti3C2Tx to Nafion in the Ti3C2Tx / Nafion layer is (0.05-0.5) to 1. T in Ti3C2Tx in the Ti3C2Tx / Nafion layer represents a -F group or a -OH group, and the -F group or the -OH group and a -F group on a Nafion membrane are strong-polar groups and are capable of generating strong chemical adsorption to polysulfide generated in a charging-discharging process and effectively preventing polysulfide from penetrating the diaphragm to reach a cathode, so that a shuttle effect is reduced, and the service life of a lithium-sulfur battery is prolonged.

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): H01M2/14H01M2/16H01M10/52H01M50/403H01M50/446
CPCH01M10/52H01M50/403H01M50/431H01M50/411Y02E60/10
Inventor 钟玲珑
Owner SHENZHEN PEICHENG TECH CO LTD
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