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Nafion film/Ti3C2Tx/sulfur composite material

A composite material, elemental sulfur technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of slow migration speed, reduce the utilization rate of sulfur active materials, deteriorate the performance of lithium-sulfur batteries, etc. Reduce the effect of the shuttle effect

Inactive Publication Date: 2017-07-25
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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  • Nafion film/Ti3C2Tx/sulfur composite material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (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;

[0018] (2) Add 0.5g Ti 3 C 2 T x Mix the powder with 10g of elemental sulfur evenly, place it in a sealed reaction kettle, heat the reaction to 155°C in a nitrogen atmosphere, keep the temperature for 12h, cool to room temperature after the reaction is completed, and obtain Ti 3 C 2 T x / sulfur composites;

[0019] (3) Ti will be obtained 3 C 2 T x The / sulfur composite material was added to 10 g of Nafion solution with a mass fraction of 5%, stirred for 1 hour, left to stand, filtered, and vacuum dried to obtain the Nafion film / Ti 3 C 2 T x / sulfur composites.

Embodiment 2

[0021] (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;

[0022] (2) Put 2g Ti 3 C 2 T x The powder was uniformly mixed with 10g of elemental sulfur, placed in a sealed reaction kettle, heated to 165°C in a nitrogen atmosphere, and kept at a constant temperature for 5h. After the reaction was completed, it was cooled to room temperature to obtain Ti 3 C 2 T x / sulfur composites;

[0023] (3) Ti will be obtained 3 C 2 T x The / sulfur composite material was added to 10 g of Nafion solution with a mass fraction of 10% and stirred for 10 hours, left to stand, filtered, and vacuum-dried to obtain the Nafion film / Ti 3 C 2 T x / sulfur composites.

Embodiment 3

[0025] (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;

[0026] (2) Add 1g Ti 3 C 2 T x Mix the powder with 10g of elemental sulfur evenly, place it in a sealed reaction kettle, heat the reaction to 160°C in a nitrogen atmosphere, keep the temperature for 10h, cool to room temperature after the reaction is completed, and obtain Ti 3 C 2 T x / sulfur composites;

[0027] (3) Ti will be obtained 3 C2 T x The / sulfur composite material was added to 40 g of Nafion solution with a mass fraction of 5%, stirred for 5 hours, left to stand, filtered, and vacuum-dried to obtain the Nafion film / Ti 3 C 2 T x / sulfur composites.

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Abstract

The invention discloses a Nafion film / Ti3C2Tx / sulfur composite material. The composite material consists of sulfur, sheet-like Ti3C2Tx and a Nafion film, the inner layer is a sulfur and Ti3C2Tx composite material, the outer layer is the Nafion film coating the sulfur and Ti3C2Tx composite material, and the mass ratio of the Nafion film, Ti3C2Tx to sulfur is (0.05 to 0.2): (0.05 to 0.2): 1. The coating layer of the Nafion film in the composite material can be used for carrying out physical protection on a sulfur-based material, and polysulfide generated in the charge and discharge process is restricted inside the Nafion film, so that the shuttle effect is reduced; and the composite material restricts the movement of the polysulfide in the two aspects such as physical confinement and chemical adsorption simultaneously, so that the service life of a lithium-sulfur battery is effectively prolonged.

Description

technical field [0001] The invention relates to the synthesis of nanometer materials, in particular to a preparation method of a cathode material of a lithium-sulfur battery. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/628H01M10/0525Y02E60/10
Inventor 钟玲珑
Owner SHENZHEN PEICHENG TECH CO LTD
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