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A kind of preparation method of lithium-sulfur battery cathode material

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of capacity fading, lithium-sulfur battery volume specific capacity is not excellent, etc.

Active Publication Date: 2021-08-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes candidates for next-generation lithium batteries focus on materials with higher theoretical specific capacity and energy density, and sulfur, as one of them, has a high theoretical specific capacity (1,675 mAh g -1 ) and energy density (2,500 Wh kg -1 ), low cost, and environmental friendliness; however, due to the non-conductive nature of sulfur, the volume specific capacity of lithium-sulfur batteries is not excellent, and lithium-sulfur batteries also have the dissolution of polysulfides and their intermediate products in the two poles during charging and discharging. The shuttle between will lead to the problem of rapid capacity decay

Method used

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  • A kind of preparation method of lithium-sulfur battery cathode material
  • A kind of preparation method of lithium-sulfur battery cathode material
  • A kind of preparation method of lithium-sulfur battery cathode material

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Embodiment 1

[0022] The preparation method of the nano-grape string lithium-sulfur battery positive electrode material described in this embodiment specifically includes the following steps:

[0023] (1) Disperse 0.05g of graphitized carbon nanotube powder in 400ml of ethanol solution, ultrasonically treat for 30min to obtain a carbon nanotube dispersion, add 40ml of 1%wt polyethyleneimine solution to the obtained carbon tube dispersion, and Ultrasonic treatment was performed for 30 min during the stirring process to obtain a carbon nanotube pretreatment solution.

[0024] (2) According to the volume ratio of carbon nanotube pretreatment liquid and polyacrylic acid of 4:1, polyacrylic acid with a mass percentage concentration of 1%wt was added to the carbon nanotube pretreatment liquid and stirred for 1 hour, and the obtained solution was mixed with methanol and ethanol Vacuum suction filtration is performed while cleaning, and the precipitate obtained by suction filtration is dried to obt...

Embodiment 2

[0034] The preparation method of the nano-grape string lithium-sulfur battery positive electrode material described in this embodiment specifically includes the following steps:

[0035] (1) Disperse 0.2g of graphitized carbon nanotube powder in 400ml of ethanol solution, ultrasonically treat for 30min to obtain a carbon nanotube dispersion, add 50ml of 1%wt polyethyleneimine solution to the obtained carbon tube dispersion, and Ultrasonic treatment was performed for 30 min during the stirring process to obtain a carbon nanotube pretreatment solution.

[0036] (2) Add polyacrylic acid with a mass percent concentration of 2%wt to the carbon nanotube pretreatment solution and stir for 3 hours according to the volume ratio of the carbon nanotube pretreatment solution to polyacrylic acid at a volume ratio of 5:1, and the resulting solution is mixed with methanol and ethanol Vacuum suction filtration is performed while cleaning, and the precipitate obtained by suction filtration is ...

Embodiment 3

[0044] The preparation method of the nano-grape string lithium-sulfur battery positive electrode material described in this embodiment specifically includes the following steps:

[0045] (1) Disperse 0.08g of graphitized carbon nanotube powder in 400ml of ethanol solution, ultrasonically treat for 30min to obtain a carbon nanotube dispersion, add 100ml of 2%wt polyethyleneimine solution to the obtained carbon tube dispersion, and Ultrasonic treatment was performed for 30 min during the stirring process to obtain a carbon nanotube pretreatment solution.

[0046] (2) According to the volume ratio of carbon nanotube pretreatment liquid and polyacrylic acid of 6:1, polyacrylic acid with a mass percent concentration of 1%wt was added to the carbon nanotube pretreatment liquid and stirred for 3 hours, and the obtained solution was mixed with methanol and ethanol Vacuum suction filtration is performed while cleaning, and the precipitate obtained by suction filtration is dried to obta...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery cathode material, belonging to the technical field of lithium batteries. The method of the present invention is to mix the graphitized carbon nanotube dispersion liquid with polyethyleneimine respectively and then mix it with polyacrylic acid, then clean it with methanol and ethanol precipitates while vacuum filtration, and then dissolve the precipitates in nitric acid Cobalt in the methanol dispersion solution; then add 2-methylimidazole into the methanol solution to fully disperse, quickly add the solution to the mixture of carbon nanotubes and cobalt nitrate, let it stand for 24 hours at room temperature, and then centrifuge and dry Finally, a composite material of the metal organic framework and the carbon nanotube is obtained; calcined in an argon atmosphere, and naturally cooled to room temperature to obtain a cathode material for a lithium-sulfur battery. The cathode material of the lithium-sulfur battery prepared by the method of the invention has the advantages of small particle size, uniformity, large specific surface area, conductivity and the like.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery cathode material, belonging to the technical field of lithium batteries. Background technique [0002] Energy is the lifeblood of the development of today's society. The depletion of fossil fuels and serious environmental pollution make the storage and application of new energy an important research hotspot. As an important energy storage system, lithium batteries have attracted much attention in the field of new energy technologies; at present, the development of new energy technologies such as electric vehicles has put forward higher requirements for lithium batteries, among which energy density and power density are aspects that need special attention . The energy density of lithium batteries is mainly determined by the energy density of electrode materials. [0003] Due to the limitations of the theoretical specific capacity and energy density of materials in traditional li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/624H01M4/625H01M10/052Y02E60/10
Inventor 张正富徐嘉辉范苏晓任艳昆
Owner KUNMING UNIV OF SCI & TECH