Preparation method of iron-containing porphyrin/carbon nano tube composite cathode material and application of composite cathode material in lithium-sulfur battery cathode

A carbon nanotube composite, cathode material technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as high cost and inability to achieve commercial use, achieve low cost, improve Coulomb efficiency and cycle stability, Simple to use effects

Active Publication Date: 2019-05-14
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is effective but the cost is high and cannot be commercialized

Method used

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  • Preparation method of iron-containing porphyrin/carbon nano tube composite cathode material and application of composite cathode material in lithium-sulfur battery cathode
  • Preparation method of iron-containing porphyrin/carbon nano tube composite cathode material and application of composite cathode material in lithium-sulfur battery cathode
  • Preparation method of iron-containing porphyrin/carbon nano tube composite cathode material and application of composite cathode material in lithium-sulfur battery cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of hemin and carbon nanotube sulfur-loaded composite cathode material and its application in lithium-sulfur batteries

[0032] (1) Preparation of carbon nanotube sulfur-loaded composite cathode material:

[0033] Carbon nanotubes and elemental sulfur are mixed at a mass ratio of 1:1 to 4, and after uniform grinding, the mass ratio of material to liquid (that is, the sum of the mass of carbon tubes or graphene materials and elemental sulfur to CS 2 The mass ratio) 1:10~15 add CS 2 Stir in medium, then place at 10-30°C to CS 2 After the volatilization is complete, the remaining substances are kept in an oven at 120-160°C for 8-12 hours, and then cooled to room temperature to obtain the carboxylated multi-walled carbon nanotube negative sulfur composite material;

[0034] In this embodiment, equivalent parameters of graphene can also be used to replace carbon nanotubes.

[0035] (2) Preparation of hemin and carbon nanotube sulfur-loaded composite ...

Embodiment 2

[0040] Example 2: Preparation of heme and carbon tube sulfur-loaded composite cathode material and its application in lithium-sulfur batteries

[0041] (1) Preparation of carbon nanotube sulfur-loaded composite cathode material:

[0042] Hydroxylated multi-walled carbon nanotubes and elemental sulfur are mixed at a mass ratio of 1:1 to 4, and after uniform grinding, the mass ratio of material to liquid (that is, the sum of the mass of carbon tubes or graphene materials and elemental sulfur to CS 2 The mass ratio) 1:10~15 add CS 2 Stir in medium, then place at 10-30°C to CS 2 After the volatilization is complete, the remaining substances are kept in an oven at 120-160°C for 8-12 hours, and then cooled to room temperature to obtain the hydroxylated multi-walled carbon nanotube negative sulfur composite material;

[0043] In this embodiment, equivalent parameters of graphene can also be used to replace carbon nanotubes.

[0044] (2) Preparation of composite cathode material of...

Embodiment 3

[0049] Example 3: Preparation of m-tetraphenylporphyrin ferric chloride and carbon tube sulfur-loaded composite cathode material and its application in lithium-sulfur batteries

[0050] (1) Preparation of carboxylated multi-walled carbon nanotube sulfur-loaded composite cathode material:

[0051] Carboxylated multi-walled carbon nanotubes and elemental sulfur are mixed at a mass ratio of 1:1 to 4, and after uniform grinding, the mass ratio of material to liquid (that is, the sum of the mass of carbon tubes or graphene materials and elemental sulfur to CS 2 The mass ratio) 1:10~15 add CS 2 Stir in medium, then place at 10-30°C to CS 2 After the volatilization is complete, the remaining substances are kept in an oven at 120-160°C for 8-12 hours, and then cooled to room temperature to obtain the carboxylated multi-walled carbon nanotube negative sulfur composite material;

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Abstract

The invention provides a preparation method of an iron-containing porphyrin / carbon nano tube composite cathode material and application of the composite cathode material in a lithium-sulfur battery cathode. The preparation method comprises the following steps: taking right amount of a carbon material by adopting a carbon tube, mixing and grinding with a sulfur elementary substance, adding CS2, fully stirring, and then drying, so that an iron-containing porphyrin / carbon nano tube composite cathode material is obtained; mixing the iron-containing porphyrin / carbon nano tube composite cathode material with carbon nano tubes and polyvinylidene fluoride, then adding N-methyl pyrrolidone and 1-10% iron-containing porphyrin, stirring, and ultrasonically and uniformly dispersing, so that slurry isobtained; and uniformly coating the obtained slurry on a current collector aluminum foil, and then drying, so that the iron-containing porphyrin / carbon nano tube composite cathode material is obtained. The preparation method provided by the invention is simple to operate, mild in conditions and easy for large-scale production; the problem that multiple sulfide ions are dissolved in liquid state electrolyte in charging and discharging processes of a lithium-sulfur battery can be solved, shuttle effect is effectively inhibited, and coulomb efficiency and cycling stability of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the research field of nanocomposite materials, and in particular relates to a method for preparing iron-containing porphyrin / carbon nanotube composite materials used in lithium-sulfur batteries to improve their electrochemical performance and suppress polysulfide shuttle effects, etc. Applications in cathodes for sulfur batteries. Background technique [0002] With the rapid development of social technology and economy, energy storage has become the key to many innovative technologies. Battery technology has made great progress driven by emerging concepts such as electric vehicles. Batteries with various mechanisms have been developed, but lithium-sulfur batteries are The most potential of the next-generation energy storage technology, because lithium-ion batteries have been commercialized since 1991, after more than 20 years of development, the performance of the positive and negative electrode materials of traditional lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M10/058
CPCY02E60/10Y02P70/50
Inventor 杨植丁欣慰聂华贵詹迎新侯俊婕王宇赖玉崇郑仙诺孔素珍黄少铭
Owner WENZHOU UNIVERSITY
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