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S/Co/CNF composite material based on waste cigarette ends as well as preparation method and application of S/Co/CNF composite material

A composite material, cigarette butt technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of obvious "shuttle effect", low degree of graphitization, poor cycle stability, etc., to slow down the shuttle effect, no cost, high The effect of conductivity

Active Publication Date: 2019-11-22
JIANGSU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can not only overcome the disadvantages of low graphitization degree and poor conductivity of waste cigarette butt-derived carbon fibers, but also solve the problems of low loading of active material sulfur, obvious "shuttle effect" and poor cycle stability of lithium-sulfur batteries to a certain extent. question

Method used

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  • S/Co/CNF composite material based on waste cigarette ends as well as preparation method and application of S/Co/CNF composite material
  • S/Co/CNF composite material based on waste cigarette ends as well as preparation method and application of S/Co/CNF composite material
  • S/Co/CNF composite material based on waste cigarette ends as well as preparation method and application of S/Co/CNF composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Pretreatment of waste cigarette butts

[0038]Put the collected waste cigarette butts into a beaker after removing the wrapping paper, add an appropriate amount of ethanol to soak for 3 hours, and pour off the soaked ethanol to remove the remaining shredded tobacco and ash on the discarded cigarette butts. Then put the soaked waste cigarette butts in a vacuum drying oven at 60°C for 12 hours, and the obtained product is marked as CB;

[0039] 2) Preparation of CB@Co / Zn-ZIF precursor

[0040] Take 0.5 g of the CB obtained in step 1) and place it in a mixture of 2-methylimidazole, Co salt and Zn salt. After standing at room temperature for 12 hours, take out the CB and put it in a vacuum drying oven for 12 hours at 60°C. The CB@Co / Zn-ZIF precursor was obtained. The ratio of the molar weight of 2-methylimidazole in the mixed solution to the total molar weight of Co salt and Zn salt is 4:1; wherein the molar ratio of Co salt and Zn salt is 1:10; the cobalt salt and zin...

Embodiment 2

[0046] 1) Pretreatment of waste cigarette butts

[0047] The collected discarded cigarette butts were put into a beaker after the wrapping paper was removed, and ethanol was added to soak for 3 hours. Then put the soaked waste cigarette butts in a vacuum drying oven at 60°C for 12 hours, and the obtained product is marked as CB;

[0048] 2) Preparation of CB@Co / Zn-ZIF precursor

[0049] Take 1.0 g of the CB obtained in step 1) and place it in a mixture of 2-methylimidazole, Co salt and Zn salt. After standing at room temperature for 12 hours, take out the CB and put it in a vacuum drying oven for 12 hours at 60°C. The CB@Co / Zn-ZIF precursor was obtained. The ratio of the molar weight of 2-methylimidazole in the mixed solution to the total molar weight of Co salt and Zn salt is 4:1; wherein the molar ratio of Co salt and Zn salt is 1:5; the cobalt salt and zinc salt used are respectively Cobalt nitrate hexahydrate and zinc nitrate hexahydrate;

[0050] 3) Preparation of Co / ...

Embodiment 3

[0055] 1) Pretreatment of waste cigarette butts

[0056] The collected discarded cigarette butts were put into a beaker after the wrapping paper was removed, and ethanol was added to soak for 3 hours. Then put the soaked waste cigarette butts in a vacuum drying oven at 60°C for 12 hours, and the obtained product is marked as CB;

[0057] 2) Preparation of CB@Co / Zn-ZIF precursor

[0058] Take 1.0 g of the CB obtained in step 1) and place it in a mixture of 2-methylimidazole, Co salt and Zn salt. After standing at room temperature for 24 hours, take out the CB and put it in a vacuum drying oven at 60°C for 12 hours. The CB@Co / Zn-ZIF precursor was obtained. The ratio of the molar weight of 2-methylimidazole in the mixed solution to the total molar weight of Co salt and Zn salt is 8:1; wherein the molar ratio of Co salt and Zn salt is 1:1; the cobalt salt and zinc salt used are respectively Cobalt nitrate hexahydrate and zinc nitrate hexahydrate;

[0059] 3) Preparation of Co / ...

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Abstract

The invention belongs to the technical field of lithium-sulfur battery materials, and relates to an S / Co / CNF composite material based on waste cigarette ends as well as a preparation method and application of the S / Co / CNF composite material. Co salt, Zn salt and imidazole ligands are subjected to an in-situ coordination reaction on waste cigarette end fibers, thus preparing a CB (at) Zn / Co-ZIF precursor, calcining the CB (at) Zn / Co-ZIF precursor to obtain a Co / CNF composite material, mixing and grinding the Co / CNF composite material and sulfur powder, and carrying out vacuum calcining to obtain the S / Co / CNF composite material. The S / Co / CNF composite material prepared by the method disclosed by the invention can overcome the defects of low graphitization degree and poor conductivity of waste cigarette end derived carbon fibers, and can solve the problems of low loading capacity of active substance sulfur, obvious shuttle effect, poor cycling stability and the like when being used as a sulfur-fixing carbon material of a lithium-sulfur battery. Most importantly, high-value resource reutilization of the waste cigarette ends can be achieved, and the economic and environment-friendly value is reflected.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery materials, and relates to a S / Co / CNF composite material based on discarded cigarette butts and its preparation method and application, in particular to a S / Co / CNF composite material based on discarded cigarette butts and its preparation method and applications as cathode materials for lithium-sulfur batteries. Background technique [0002] With the growth of population and the development of economy, the problems of environmental pollution and energy shortage have increasingly become the focus of social attention. In recent years, in the field of energy, lithium-sulfur batteries have become one of the most promising new-generation energy storage systems due to their high theoretical specific capacity (1675mAh / g) and high energy density (2600Wh / kg). However, due to the poor conductivity of sulfur, the "shuttle effect" of soluble lithium polysulfide during charge and discharge, and i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCH01M4/364H01M4/625H01M4/38Y02E60/10
Inventor 宋肖锴冯莹莹江钰周雅静
Owner JIANGSU UNIVERSITY OF TECHNOLOGY
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