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Flexible lithium-sulfur battery positive electrode material, and preparation method and application thereof

A technology for lithium-sulfur batteries and cathode materials, which can be used in electrode manufacturing, battery electrodes, active material electrodes, etc., and can solve problems such as poor conductivity and storage performance

Inactive Publication Date: 2021-05-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects or deficiencies of the existing lithium-sulfur battery cathode materials in poor electrical conductivity and storage performance, and to provide a method for preparing a flexible lithium-sulfur battery cathode material

Method used

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  • Flexible lithium-sulfur battery positive electrode material, and preparation method and application thereof
  • Flexible lithium-sulfur battery positive electrode material, and preparation method and application thereof
  • Flexible lithium-sulfur battery positive electrode material, and preparation method and application thereof

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Experimental program
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Embodiment 1

[0067] This embodiment provides a method for preparing a cathode material for a lithium-sulfur battery.

[0068] First, stir 0.63g of nano-sulfur in 120mL of acetone at room temperature for 30min, so that the sulfur reaches the dissolution-precipitation equilibrium, and obtain a sulfur-containing suspension; then add 0.07g of porous carbon (YP80) into the suspension, and disperse with 100Hz ultrasonic for 30min After 300 minutes at room temperature until the acetone is completely volatilized, 100 mL of deionized water and 0.3 g of carbon nanotubes (CNTs) are added thereto, ultrasonic dispersion is continued for 30 minutes, and flexible films and flexible positive electrode materials are obtained by suction filtration.

Embodiment 2

[0070] This embodiment provides a method for preparing a cathode material for a lithium-sulfur battery.

[0071] First, stir 0.64g of nano-sulfur in 120mL of acetone at room temperature for 30min, so that the sulfur reaches the dissolution-precipitation equilibrium, and obtain a sulfur-containing suspension; then add 0.16g of porous carbon (YP80) into the suspension, and disperse with 100Hz ultrasonic for 30min After 300 minutes at room temperature until the acetone is completely volatilized, 100 mL of deionized water and 0.2 g of carbon nanotubes (CNTs) are added thereto, ultrasonic dispersion is continued for 30 minutes, and flexible films and flexible positive electrode materials are obtained by suction filtration.

Embodiment 3

[0073] This embodiment provides a method for preparing a cathode material for a lithium-sulfur battery.

[0074] First, stir 0.56g of nano-sulfur in 120mL of acetone at room temperature for 30min, so that the sulfur reaches the dissolution-precipitation equilibrium, and obtain a sulfur-containing suspension; then add 0.14g of porous carbon (YP80) into the suspension, and disperse with 100Hz ultrasonic for 30min After 300 minutes at room temperature until the acetone is completely volatilized, 100 mL of deionized water and 0.3 g of carbon nanotubes (CNTs) are added thereto, ultrasonic dispersion is continued for 30 minutes, and flexible films and flexible positive electrode materials are obtained by suction filtration.

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Abstract

The invention relates to a flexible lithium-sulfur battery positive electrode material, and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving elemental sulfur in an organic solvent to obtain a sulfur solution; S2, adding a carrier carbon material into the sulfur solution, uniformly mixing, and then removing the organic solvent to obtain a sulfur-carbon compound; and S3, dispersing the sulfur-carbon compound in a poor solvent of sulfur, adding a skeleton carbon material, uniformly mixing, and removing the poor solvent to obtain the flexible lithium-sulfur battery positive electrode material. The preparation method provided by the invention is simple in process, cheap and easily available in raw materials and convenient to operate; and the prepared flexible lithium-sulfur battery positive electrode material has excellent conductivity and electricity storage performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a flexible lithium-sulfur battery anode material and a preparation method and application thereof. Background technique [0002] With the rapid growth of social productivity, human demand for energy is increasing day by day. Traditional lithium-ion batteries can no longer meet the high demand for energy storage systems in the rapidly developing emerging industries. New battery energy storage systems with high theoretical capacity are developed. become a priority. [0003] In the current energy storage system, lithium-ion batteries have high energy density (such as: in LiCoO 2 In the graphene battery, the energy density is 387W h kg-1), the working voltage is high, and the service life is long, which has been recognized by the market. However, the liquid electrolyte currently used makes the working voltage of lithium-ion batteries only lower than 4.3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/133H01M4/1393H01M4/583H01M4/02
CPCH01M4/0416H01M4/133H01M4/1393H01M4/583H01M2004/028Y02E60/10
Inventor 麦堪成杨康章自寿李富镇刘秀陈耀光劳钲淇
Owner SUN YAT SEN UNIV
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