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Preparation method of metal phthalocyanine/carbon tube composite material and application thereof in lithium-sulfur battery cathode

A composite material and metal phthalocyanine technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low utilization rate of active materials, hindering the practical process, metal lithium corrosion, etc., to achieve easy mass production and inhibit shuttle effect, solve the effect of dissolution

Inactive Publication Date: 2019-05-07
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium polysulfides formed during charging and discharging of lithium-sulfur batteries are easily soluble in liquid electrolytes, causing shuttle effects, volume expansion during charging and discharging, and corrosion of metal lithium, resulting in low utilization of active materials in lithium-sulfur batteries. , low coulombic efficiency, and poor cycle performance seriously hinder its practical application

Method used

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  • Preparation method of metal phthalocyanine/carbon tube composite material and application thereof in lithium-sulfur battery cathode
  • Preparation method of metal phthalocyanine/carbon tube composite material and application thereof in lithium-sulfur battery cathode
  • Preparation method of metal phthalocyanine/carbon tube composite material and application thereof in lithium-sulfur battery cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Preparation of Iron Phthalocyanine / Carbon Tube Composite Material and Its Application in Lithium-Sulfur Batteries

[0026] (1) Preparation of carbon tube sulfur-loaded composite material: Take 200 mg of carbon tubes and 400 mg of elemental sulfur in a mortar, thoroughly grind the carbon tubes and sulfur evenly, transfer the resulting mixture to a 25 ml weighing bottle, and add 4.0 mL of CS 2 Stir well, wait until CS 2 After the volatilization is complete, transfer the mixture to an oven at 120°C for 12 hours, then cool to room temperature, and collect the resulting product to obtain the carbon tube sulfur-loaded composite material;

[0027] (2) Preparation of iron phthalocyanine / carbon tube composite material: mix 400 mg of carbon tube sulfur-loaded composite material with 50 mg of conductive additive carbon nanotube, 50 mg of binder polyvinylidene fluoride, and 5-10 mg of iron phthalocyanine, and then add 2.5 mL NMP and ultrasonically dispersed, fully stirre...

Embodiment 2

[0032] Example 2: Preparation of cobalt phthalocyanine / carbon tube composite material and its application in lithium-sulfur batteries

[0033] (1) Preparation of carbon tube sulfur-loaded composite material: Take 200 mg of carbon tubes and 400 mg of elemental sulfur in a mortar, thoroughly grind the carbon tubes and sulfur evenly, transfer the resulting mixture to a 25 ml weighing bottle, and add 4.0 mL of CS 2 Stir well, wait until CS 2 After the volatilization is complete, transfer the mixture to an oven at 120°C for 12 hours, then cool to room temperature, and collect the resulting product to obtain the carbon tube sulfur-loaded composite material;

[0034] (2) Preparation of cobalt phthalocyanine / carbon tube composite material: mix 400 mg of carbon tube sulfur-loaded composite material with 50 mg of conductive additive carbon nanotube, 50 mg of binder polyvinylidene fluoride, and 5-10 mg of cobalt phthalocyanine, and then add 2.5 mL NMP and ultrasonically dispersed, fully...

Embodiment 3

[0038] Example 3 Preparation of Copper Phthalocyanine / Carbon Tube Composite Material and Its Application in Lithium-Sulfur Batteries

[0039] (1) Preparation of carbon tube sulfur-loaded composite material: Take 200 mg of carbon tubes and 400 mg of elemental sulfur in a mortar, thoroughly grind the carbon tubes and sulfur evenly, transfer the resulting mixture to a 25 ml weighing bottle, and add 4.0 mL of CS 2 Stir well, wait until CS 2 After the volatilization is complete, transfer the mixture to an oven at 120°C for 12 hours, then cool to room temperature, and collect the resulting product to obtain the carbon tube sulfur-loaded composite material;

[0040] (2) Preparation of copper phthalocyanine / carbon tube composite material: mix 400 mg of carbon tube sulfur-loaded composite material with 50 mg of conductive additive carbon nanotube, 50 mg of binder polyvinylidene fluoride, and 5-10 mg of copper phthalocyanine, and then add 2.5 mL NMP and ultrasonically dispersed, fully ...

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Abstract

The invention provides a preparation method of a metal phthalocyanine / carbon tube composite material and application thereof in a lithium-sulfur battery cathode. The preparation method comprises the steps of: mixing and grinding a carbon tube and a sulfur element, and adding CS2 for full stirring and then drying to prepare a carbon tube sulfur-carrier composite material; and mixing the carbon tubesulfur-carrier composite material with the carbon nanotube, polyvinylidene fluoride and metal phthalocyanine in a certain mass ratio, then adding N-methylpyrrolidone for stirring and uniform ultrasonic dispersion, controlling the viscosity in a range of 1000-10000 cps to obtain slurry, coating the slurry on a current collector aluminum foil with a thickness of 150-400 mm, and performing drying toobtain a metal phthalocyanine / carbon tube composite material. The preparation method of the metal phthalocyanine / carbon tube composite material is simple to operate and easy for large-scale production. The prepared composite material is used in lithium-sulfur batteries to solve the dissolution of polysulfide ions in liquid electrolyte during charging and discharging of lithium-sulfur batteries, effectively suppress the shuttle effect and improve the coulombic efficiency and the cycle stability of the lithium-sulfur batteries.

Description

technical field [0001] The invention belongs to the research field of nanocomposite materials, and in particular relates to a preparation method of a metal phthalocyanine / carbon tube composite material used for the positive electrode of a lithium-sulfur battery and its application in the positive electrode of the lithium-sulfur battery. Background technique [0002] With the rapid economic development and increasing energy consumption, the depletion of fossil fuel reserves and the environmental pollution caused by combustion have made people's demand for new alternative energy sources more and more urgent. New energy, especially chemical energy, has the characteristics of cleanness, environmental protection, safety and efficiency, and meets the requirements of the sustainable development strategy of human beings, so it is very popular. Since its commercialization in 1991, lithium-ion batteries have been widely used in portable electronic communication equipment, grid storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/62B82Y40/00
CPCY02E60/10
Inventor 杨植周苏雅聂华贵张永贵禅丹丁欣慰赖玉崇
Owner WENZHOU UNIVERSITY
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