Composite layer, preparation method thereof and lithium-sulfur battery

A lithium-sulfur battery and composite layer technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as difficult performance, improve cycle stability, reduce the use of binders, and reduce costs Effect

Active Publication Date: 2021-12-31
中科南京绿色制造产业创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although many materials have been studied to alleviate the shuttling effect of polysulfides, it is difficult for the currently adopted single-component protective layer to have the above properties

Method used

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  • Composite layer, preparation method thereof and lithium-sulfur battery
  • Composite layer, preparation method thereof and lithium-sulfur battery
  • Composite layer, preparation method thereof and lithium-sulfur battery

Examples

Experimental program
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Embodiment 1

[0037] This embodiment provides a composite layer, which includes intertwined vanadium trioxide nanowires and carbon nanofibers and polydopamine coated on the vanadium trioxide nanowires and carbon nanofibers, so The carbon nanofibers are prepared by sintering and carbonizing bacterial cellulose, and the thickness of the composite layer is 15 μm.

[0038] The preparation method of the composite layer is as follows:

[0039] (1) V with a mass ratio of 1:1 2 o 5 Nanofibers and bacterial cellulose are mixed, dispersed in deionized water, and the mixture is obtained after suction filtration, and a precursor material is obtained after adding 0.2 mg / ml dopamine solution and suction filtration;

[0040] (2) Freeze-drying the precursor material and then sintering in argon, the sintering temperature is 600° C., and the sintering time is 2 hours, to obtain the composite layer.

[0041] figure 1 For the surface scanning electron micrograph of the composite layer material prepared in ...

Embodiment 2

[0044] This embodiment provides a composite layer, which includes intertwined vanadium trioxide nanowires and carbon nanofibers and polydopamine coated on the vanadium trioxide nanowires and carbon nanofibers, so The carbon nanofibers are prepared by sintering and carbonizing bacterial cellulose, and the thickness of the composite layer is 15 μm.

[0045] The preparation method of the composite layer is as follows:

[0046] (1) V with a mass ratio of 1:5 2 o 5 Nanofibers and bacterial cellulose are mixed, dispersed in deionized water, and the mixture is obtained after suction filtration, and a precursor material is obtained after adding 0.2 mg / ml dopamine solution and suction filtration;

[0047] (2) Freeze-drying the precursor material and then sintering in argon, the sintering temperature is 600° C., and the sintering time is 2 hours, to obtain the composite layer.

[0048] image 3 For the surface scanning electron micrograph of the composite layer material prepared in em...

Embodiment 3

[0050] This embodiment provides a composite layer, which includes intertwined vanadium trioxide nanowires and carbon nanofibers and polydopamine coated on the vanadium trioxide nanowires and carbon nanofibers, so The carbon nanofibers are prepared by sintering and carbonizing bacterial cellulose, and the thickness of the composite layer is 15 μm.

[0051] The preparation method of the composite layer is as follows:

[0052] (1) V with a mass ratio of 5:1 2 o 5 Nanofibers and bacterial cellulose are mixed, dispersed in deionized water, and the mixture is obtained after suction filtration, and a precursor material is obtained after adding 0.2 mg / ml dopamine solution and suction filtration;

[0053] (2) Freeze-drying the precursor material and then sintering in argon, the sintering temperature is 600° C., and the sintering time is 2 hours, to obtain the composite layer.

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Abstract

The invention provides a composite layer, a preparation method thereof and a lithium-sulfur battery. The composite layer comprises vanadium trioxide nanowires and carbon nanofibers which are wound with each other, and a polymer coating the vanadium trioxide nanowires and the carbon nanofibers. According to the invention, vanadium trioxide nanowires and carbon nanofibers are subjected to in-situ compounding, and a composite layer integrating high conductivity, strong adsorbability and an efficient catalytic function is constructed. The carbon nanofibers can provide a three-dimensional conductive transmission network, and electrons and lithium ions can be effectively transmitted. The polymer can modify the surface of the composite layer, and the stability of the composite layer is comprehensively improved. The composite layer can fully relieve the shuttle effect of polysulfide in the lithium-sulfur battery, improve the adsorption capacity of the polysulfide and promote the conversion of the polysulfide, and finally, the lithium-sulfur battery shows good rate capability and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery materials, and in particular relates to a composite layer, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] With the popularity of portable electronic devices and electric vehicles, the development of secondary batteries with high energy density is gradually accelerating. In recent decades, lithium-sulfur batteries have been used due to their high 2567Wh kg −1 The theoretical energy density has attracted much attention. In addition, the S element in the cathode has the advantages of abundant reserves, low cost, and low toxicity. However, since S and Li 2 The insulating properties of S, the large volume change during charging and discharging, and the shuttling effect of polysulfides (LiPSs) limit the further development of lithium-sulfur batteries. In particular, the shuttle effect generated by the dissolution and transformation of LiPSs l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/628H01M4/624H01M4/625H01M10/052Y02E60/10
Inventor 胡超权王宝赵婕
Owner 中科南京绿色制造产业创新研究院
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