Zinc sulfide nano-belt, preparation and application thereof in preparing anode material of lithium sulfur battery

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 poor cycle performance, long preparation process, low energy density, etc.

Active Publication Date: 2017-07-07
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

Method used

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  • Zinc sulfide nano-belt, preparation and application thereof in preparing anode material of lithium sulfur battery
  • Zinc sulfide nano-belt, preparation and application thereof in preparing anode material of lithium sulfur battery
  • Zinc sulfide nano-belt, preparation and application thereof in preparing anode material of lithium sulfur battery

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0107] Example 1

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

[0109] Disperse the prepared zinc sulfide nanobelt in 500 mL of ionized water, add 1 g 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 , Heat to 600℃ under argon protection, and keep it for 1 hour. The product was added to 200 ml of ferric chloride solution with a concentration of 10% and stirred overnight (12h), and the obtained product was dried at 60°C. The actual sulfur content is 50wt.% through thermogravimetric test. The resulting composite cathode material, conductive...

Example Embodiment

[0111] Example 2

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

[0113] Disperse the prepared zinc sulfide nanobelt in 500 mL of ionized water, add 3 g 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 , Heat to 800℃ under argon protection, and keep it for 5 hours. Add the product to 500 ml of ferric chloride solution with a concentration of 15% and stir overnight (12h), and then dry the product at 60°C. The resulting composite cathode material, conductive carbon black, and polyvinylidene fluoride (PVDF) are uniformly mixed in a mass ratio of 8:1:1, and dispersed in a ce...

Example Embodiment

[0115] Example 3

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

[0117] Disperse the prepared zinc sulfide nanobelt in 500 mL of ionized water, add 4 g 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 , Heat to 800℃ under argon protection, and keep it for 5 hours. Add the product to 500 ml of iron sulfide solution with a concentration of 30% and stir overnight (12h), and then dry the product at 60°C. The actual sulfur content is 70.8wt.% through thermogravimetric test. The resulting composite cathode material, conductive carbon black, and polyvinylidene fluoride (P...

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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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IPC IPC(8): C01G9/08C01B32/05C01B17/06H01M4/36H01M4/38H01M4/62H01M10/052
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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