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Coating material for functional interlayer of lithium-sulfur battery and preparation method thereof

A coating material, a technology for lithium-sulfur batteries, applied in lithium batteries, carbon preparation/purification, battery pack components, etc. Chemical adsorption capacity, large specific surface area, effect of increasing electrical conductivity

Pending Publication Date: 2020-07-31
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the functional coatings currently used are carbon-based materials, such as carbon nanotubes, graphene, carbon nanospheres, etc. Although traditional carbon-based materials have a large specific surface area, their surfaces can chemically adsorb polysulfides. There are few binding sites, basically relying on physical adsorption to bind polysulfides, the adsorption capacity is limited, and the diffusion of polysulfides cannot be well inhibited

Method used

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  • Coating material for functional interlayer of lithium-sulfur battery and preparation method thereof
  • Coating material for functional interlayer of lithium-sulfur battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] The coating material used for the functional interlayer of the lithium-sulfur battery is a sea urchin-like carbon-coated cobalt sulfide composite material.

[0025] The preparation method of the coating material for the functional interlayer of lithium-sulfur battery comprises the following steps:

[0026] (1) Preparation of sea urchin-like cobalt tetroxide: First, weigh 0.2g of cobalt chloride and dissolve it in 10mL of deionized water and stir it on a magnetic stirrer for 2h to obtain a cobalt chloride solution; weigh 2g of urea and dissolve it in 10mL of deionized water on a magnetic stirrer Stir for 2 hours to obtain a urea solution; then add the cobalt chloride solution into the urea solution, stir evenly, place it in a 150mL reactor, react for 6 hours at 150°C, and cool to room temperature naturally. Each was centrifuged and washed 3 times, dried at 60°C for 12 hours, and then placed in a muffle furnace for calcination at 200°C to obtain sea urchin-like cobalt tet...

Embodiment 2

[0031] The preparation method of the coating material for the functional interlayer of lithium-sulfur battery comprises the following steps:

[0032] (1) Preparation of sea urchin-like cobalt tetroxide: First, weigh 0.1g of cobalt chloride and dissolve it in 20mL of deionized water and stir it on a magnetic stirrer for 3h to obtain a cobalt chloride solution; weigh 1g of urea and dissolve it in 20mL of deionized water on a magnetic stirrer Stir for 3 hours to obtain a urea solution; then add the cobalt chloride solution into the urea solution, stir evenly, place it in a 150mL reactor for 4 hours at 120°C, and cool it down to room temperature naturally. Each was centrifuged and washed 3 times, dried at 60°C for 12 hours, and then placed in a muffle furnace for calcination at 150°C to obtain sea urchin-like cobalt tetroxide powder;

[0033] (2) Preparation of sea urchin-shaped carbon-coated cobalt oxide: Weigh 0.2 g of sea urchin-shaped cobalt tetroxide powder obtained in step (...

Embodiment 3

[0036] The preparation method of the coating material for the functional interlayer of lithium-sulfur battery is characterized in that it comprises the following steps:

[0037] (1) Preparation of sea urchin-like cobalt tetroxide: first weigh 0.4g of cobalt chloride and dissolve it in 20mL of deionized water and stir it on a magnetic stirrer for 1h to obtain a cobalt chloride solution; weigh 4g of urea and dissolve it in 20mL of deionized water on a magnetic stirrer Stir for 1 hour to obtain a urea solution; then add the cobalt chloride solution into the urea solution, stir evenly, place it in a 150mL reactor, react for 8 hours at 170°C, and cool to room temperature naturally. Each was centrifuged and washed 3 times, dried at 60°C for 12 hours, and then placed in a muffle furnace for calcination at 300°C to obtain sea urchin-like cobalt tetroxide powder;

[0038] (2) Preparation of sea urchin-shaped carbon-coated cobalt oxide: Weigh 0.6 g of sea urchin-shaped cobalt tetroxide ...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a coating material for a functional interlayer of a lithium-sulfur battery and a preparation method thereof. The coating material is a sea urchin-shaped carbon-coated cobalt sulfide composite material. When the coating material is coated on a functional interlayer of a lithium-sulfur battery, theobvious shuttle effect of polysulfide in the current lithium-sulfur battery can be effectively relieved, and the stable electrochemical performance of the battery is ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a coating material for a functional interlayer of lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the rapid development of science and technology and communication, the development of new materials for energy storage with high specific energy has become an urgent need. The theoretical specific capacity of lithium-sulfur batteries reaches 1672mAh / g (theoretical energy density can reach 2600Wh / kg), which is several times the specific capacity of existing lithium-ion batteries, and sulfur has the advantages of abundant reserves, low price and environmental friendliness. Therefore, lithium-sulfur batteries have become one of the most research-worthy energy storage systems. [0003] Although lithium-sulfur batteries have the great advantage of high energy density, there are also some problems to be solved urge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01B32/05H01M2/16H01M10/052H01M50/431H01M50/449
CPCC01G51/30C01B32/05H01M10/052C01P2004/30C01P2004/03C01P2006/40H01M50/431H01M50/449Y02E60/10
Inventor 钊妍王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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