A zinc sulfide nanobelt, its preparation and its application in the preparation of cathode materials for lithium-sulfur batteries

A positive electrode material, lithium-sulfur battery technology, applied in the direction of zinc sulfide, battery electrodes, lithium batteries, etc., can solve the problems of low energy density, poor cycle performance, low load capacity, etc.

Active Publication Date: 2019-08-16
GUANGDONG MIC POWER NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the shortcomings of nitrogen-doped carbon / sulfur cathode materials in the prior art, such as low sulfur doping and low loading capacity, low energy density, poor cycle performance, and long preparation process, the third purpose of the present invention is to use the Lithium-sulfur battery cathode material prepared by preparation method of cathode material for lithium-sulfur battery

Method used

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  • A zinc sulfide nanobelt, its preparation and its application in the preparation of cathode materials for lithium-sulfur batteries
  • A zinc sulfide nanobelt, its preparation and its application in the preparation of cathode materials for lithium-sulfur batteries
  • A zinc sulfide nanobelt, its preparation and its application in the preparation of cathode materials for lithium-sulfur batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0108] Mix 0.2 gram of zinc chloride with 0.2 gram of thioacetamide (S / Zn molar ratio is 1.8), and 0.08 gram of sodium lauryl sulfate, mix evenly and transfer to a hydrothermal kettle, keep warm at 120°C for 6 hours, and separate the solid and liquid. After drying, the zinc sulfide nanobelt can be prepared; the zinc sulfide nanobelt has a length of 120nm and a diameter of 30nm.

[0109] Disperse the prepared zinc sulfide nanobelts in 500mL of ionized water, add 1 gram of dopamine hydrochloride monomer, then add Tris-buffer to adjust the pH to 8.5, and keep it for 6 hours. The solid product is freeze-dried and transferred to an atmosphere furnace , heated to 600°C under the protection of argon, and kept for 1 hour. The product was added into 200 ml of ferric chloride solution with a concentration of 10% and stirred overnight (12 hours), and the obtained product was dried at 60°C. Its actual sulfur content is 50wt.% by thermogravimetric test. Gained composite positive electrod...

Embodiment 2

[0112] Mix 0.2 gram of zinc chloride with 0.4 gram of thioacetamide (S / Zn molar ratio is 3.6), and 0.1 gram of sodium lauryl sulfate, and transfer them to a hydrothermal kettle, keep the temperature at 180° C. for 6 hours, and separate the solid and liquid. And after drying, the zinc sulfide nanobelt can be obtained, the length of which is 150nm, and the diameter is 60nm.

[0113] Disperse the prepared zinc sulfide nanobelts in 500mL of ionized water, add 3 grams of dopamine hydrochloride monomer, then add Tris-buffer to adjust the pH to 8.8, and keep it for 6 hours. The solid product is freeze-dried and transferred to an atmosphere furnace , heated to 800°C under the protection of argon, and kept for 5 hours. Add the product into 500 ml of ferric chloride solution with a concentration of 15%, stir overnight (12 hours), and dry the obtained product at 60°C. Gained composite positive electrode material, conductive carbon black, polyvinylidene fluoride (PVDF) are uniformly mixe...

Embodiment 3

[0116] Mix 0.2 gram of zinc chloride with 0.5 gram of thioacetamide (S / Zn molar ratio is 4.5), and 0.1 gram of sodium lauryl sulfate, mix evenly and transfer to a hydrothermal kettle, keep the temperature at 200°C for 10 hours, and separate the solid and liquid. And after drying, the zinc sulfide nanobelt can be obtained, the length of which is 180nm, and the diameter is 40nm.

[0117] Disperse the prepared zinc sulfide nanobelts in 500mL of ionized water, add 4 grams of dopamine hydrochloride monomer, then add Tris-buffer to adjust the pH to 8.5, and keep it for 12 hours. The solid product is freeze-dried and transferred to an atmosphere furnace , heated to 800°C under the protection of argon, and kept for 5 hours. The product was added into 500 ml of iron sulfide solution with a concentration of 30% and stirred overnight (12 hours), and the obtained product was dried at 60°C. The actual sulfur content is 70.8wt.% by thermogravimetric test. Gained composite positive electro...

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Abstract

The invention discloses a method for preparing nanometer belt-shaped zinc sulfide, and a method for taking the nanometer belt-shaped zinc sulfide as a template for preparing a nitrogen-doped carbon / sulfur compound anode material, a preparation method and an application thereof. The nanometer belt-shaped zinc sulfide is acquired through the hydrothermal reaction under the condition of zinc source, sulfur source and surface active agent. The nitrogen-doped carbon / sulfur compound anode material is composed of nitrogen-doped coated sulfur. The preparation method comprises the following steps: coating polydopamine on the surface of zinc sulfide and carbonizing under a protective atmosphere condition; adding a ferric salt; separating liquid from solid; and freezing and drying the solid product, thereby acquiring the nitrogen-doped carbon / sulfur compound anode material. The compound anode material is large in nitrogen doped volume, controllable in sulfur capacity, uniform in load and high in use ratio of active substance sulfur, has the advantages of high specific capacity, high energy density and high stability and is capable of greatly improving the cycle performance of the lithium sulfur battery.

Description

technical field [0001] The invention relates to the preparation of zinc sulfide nanobelts, in particular to a preparation method thereof, and the application of the prepared zinc sulfide nanobelts to the preparation of positive electrode materials for lithium-sulfur batteries. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronics, electric vehicles, and plug-in hybrid electric vehicles, there is an urgent need to develop batteries with higher energy density. As the specific capacity of lithium-ion battery cathode materials is limited, it is difficult to further increase the energy density of lithium-ion batteries. At the same time, increasing the energy density by increasing the voltage platform of the cathode material will bring safety problems. Changing the cathode material from the "deintercalation mechanism" to the "conversion reaction chemical mechanism" is expected to obtain materials with high specific capacity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCC01B17/06C01G9/08C01P2002/54C01P2004/03C01P2004/17C01P2006/40H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 赖延清张治安王鹏张志帅孙学文郭靖王军言韩兴璞
Owner GUANGDONG MIC POWER NEW ENERGY CO LTD
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