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Method for preparing carbon fibre cloth loaded sulphur composite material

A technology of carbon fiber cloth and composite materials, which is applied in the field of preparation of carbon fiber cloth-loaded sulfur composite materials, which can solve problems affecting battery performance and positive electrode internal structure damage, and achieve stable cycle performance, improved electrochemical performance, and reduced process costs.

Active Publication Date: 2015-05-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, Li 2 S 2 , Li 2 S and S 8 The difference in density and the Li 2 S 2 , Li 2 The deposition of S will lead to the destruction of the internal structure of the positive electrode and affect the performance of the battery.

Method used

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  • Method for preparing carbon fibre cloth loaded sulphur composite material
  • Method for preparing carbon fibre cloth loaded sulphur composite material
  • Method for preparing carbon fibre cloth loaded sulphur composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of Carbon Fiber Cloth Loaded Sulfur Composite

[0028] The steps of preparation method are as follows:

[0029] 1) Functionalization of carbon fiber cloth: Take 2×2cm cotton fiber cloth, soak it in sodium hydroxide solution in a water bath at 80°C for 5h, dry it, place it in a tube furnace, and heat it at 200°C for 3h in an argon atmosphere, then raise the temperature After heat treatment at 850°C for 2 hours, a carbonized fiber cloth was obtained; the fibers were placed in concentrated nitric acid and boiled for 8 hours under reflux to obtain a functionalized conductive carbon fiber cloth;

[0030] 2) Loading nano-sulfur particles by hydrothermal method: put the carbon fiber cloth in step (a) in the prepared deionized water / ethanol / sublimed sulfur / carbon disulfide solution system, the mass ratio of carbon fiber cloth: sulfur is 1:7, and move into In a 100mL reactor, a composite material of carbon fiber cloth loaded with nano-sulfur particles was obtained...

Embodiment 2

[0035] 1) Functionalization of carbon fiber cloth: take 2×2cm cotton fiber cloth, soak it in sodium hydroxide solution in a water bath at 80°C for 10 hours, dry it and place it in a tube furnace, heat-treat it at 200°C for 10 hours in an argon atmosphere, and then heat it up After heat treatment at 1000°C for 2 hours, a carbonized fiber cloth was obtained; the fibers were placed in perchloric acid and boiled for 2 hours under reflux to obtain a functionalized conductive carbon fiber cloth;

[0036]2) Loading nano-sulfur particles by hydrothermal method: put the carbon fiber cloth in step (a) in the prepared ethanol / sublimed sulfur / carbon disulfide solution system, the mass ratio of carbon fiber cloth: sulfur is 1:5, and move it into a 100mL reaction kettle , after hydrothermal reaction at 100℃ for 48h, the composite material of carbon fiber cloth loaded with nano-sulfur particles was obtained.

Embodiment 3

[0038] 1) Functionalization of carbon fiber cloth: Take a 2×2cm cotton fiber cloth, soak it in potassium hydroxide solution in a water bath at 80°C for 5 hours, dry it and place it in a tube furnace, heat-treat it at 300°C for 1 hour in a nitrogen atmosphere, and then heat it up to Carbonized fiber cloth was obtained after heat treatment at 750°C for 2 hours; the fibers were placed in concentrated sulfuric acid and refluxed and boiled for 10 hours to obtain functionalized conductive carbon fiber cloth;

[0039] 2) Loading of nano-sulfur particles by hydrothermal method: place the carbon fiber cloth in step (a) in the prepared water / isopropanol / sublimed sulfur / carbon disulfide solution system, the mass ratio of carbon fiber cloth: sulfur is 1:1, and move into In a 100mL reactor, after hydrothermal reaction at 150°C for 24h, a composite material of carbon fiber cloth loaded with nano-sulfur particles was obtained.

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Abstract

The invention relates to a method for preparing a carbon fibre cloth loaded sulphur composite material, belonging to the technical field of electrode materials for ion batteries. The method disclosed by the invention comprises the following main steps of thermally treating by using cotton woven fibre cloth as the raw material so as to obtain functionalized conductive fibre cloth, and carrying out hydrothermal reaction by taking deionized water / alcohol solvent / sulphur / carbon disulfide as a reaction system so as to obtain a carbon fibre cloth loaded nano sulphur particle composite material. According to a composite positive electrode of carbon fibre cloth loaded sulphur, carbon fibre cloths are connected in a staggered manner so as to form a three-dimensional orderly conductive network; more sulphur can be adsorbed through the supramaximal specific surface area; the carbon fibre cloth loaded sulphur composite material prepared through the simple method can be directly used as a pole piece; the fussy processes of pulping, coating and the like in traditional electrode preparation can be omitted; and a beneficial way is provided for application of the sulphur positive electrode.

Description

technical field [0001] The invention relates to a preparation method of a carbon fiber cloth loaded sulfur composite material, which belongs to the technical field of lithium ion battery electrode materials. Background technique [0002] With the rapid development of society, the demand for energy is increasing day by day, and the pollution of fossil fuels to the environment and the depletion of reserves have made people's demand for new alternative energy sources increasingly urgent. my country is one of the countries with the most serious waste of resources in the world, and the waste of cotton fabric resources is one of the biggest wastes, while my country produces about 4 million tons of waste cotton fabric every year. The latest research has found that cotton fabrics are not only used as wearable clothing, but also can be used to make energy storage containers with special functions. However, the conductivity of cotton fabric fibers is extremely poor, and researchers u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCB82Y30/00H01M4/366H01M4/38H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 蒋永赵兵凌学韬陆孟娜陈卢焦正吴明红
Owner SHANGHAI UNIV
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