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Ti3C2Tx/oxidized graphene/Celgard composite membrane

A technology of composite diaphragm and graphene layer, which is applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of reducing the utilization rate of sulfur active materials, slow migration speed, and deteriorating the performance of lithium-sulfur batteries, so as to reduce the shuttle effect, life-enhancing effect

Inactive Publication Date: 2017-07-21
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/oxidized graphene/Celgard composite membrane
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  • Ti3C2Tx/oxidized graphene/Celgard composite membrane

Examples

Experimental program
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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) Combine 10g graphite oxide and 2gTi 3 C 2 T x The powder is added to water for ultrasonic dispersion, and the ultrasonic time is 1 hour to form a suspension with a concentration of 0.1mg / mL, then add the suspension to a suction filter bottle with a Celgard diaphragm and filter paper, and tear off the filter paper after drying and get Ti 3 C 2 T x / Graphene Oxide / Celgard Composite Separator.

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) Combine 10g graphite oxide and 10gTi 3 C 2 T x Add the powder into water for ultrasonic dispersion. The ultrasonic time is 5 hours to form a suspension with a concentration of 1 mg / mL. Then add the suspension to a suction filter bottle with a Celgard diaphragm and filter paper for suction filtration. After drying, tear off the filter paper and get Ti 3 C 2 T x / Graphene Oxide / Celgard Composite Separator.

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) Combine 10g graphite oxide and 6gTi 3 C 2 T x The powder is added to water for ultrasonic dispersion, and the ultrasonic time is 3 hours to form a suspension with a concentration of 0.5mg / mL, then add the suspension to a suction filter bottle with a Celgard diaphragm and filter paper, and tear off the filter paper after drying and get Ti 3 C 2 T x / Graphene Oxide / Celgard Composite Separator.

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Abstract

The invention provides a Ti3C2Tx / oxidized graphene / Celgard composite membrane. The Ti3C2Tx / oxidized graphene / Celgard composite membrane comprises a Celgard membrane and a Ti3C2Tx / oxidized graphene layer on the surface of the Celgard membrane, wherein the thickness of the Ti3C2Tx / oxidized graphene layer is 1 to 10 microns; and the mass ratio of Ti3C2Tx to oxidized graphene in the Ti3C2Tx / oxidized graphene layer is 1: (0.2 to 1). T on Ti3C2Tx in the Ti3C2Tx / oxidized graphene layer is -F group or -OH group, and is a strongly polar group together with oxygen on the surface of the oxidized graphene, strong chemical adsorption can be formed with a polysulfide formed in the charging and discharging process, the polysulfide can be effectively prevented from passing through the membrane to reach a positive electrode, the occurrence of a shuttle flying 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 preparation method of 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 electroni...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/446H01M50/489
CPCH01M50/403H01M50/431H01M50/411Y02E60/10
Inventor 钟玲珑
Owner SHENZHEN PEICHENG TECH CO LTD
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