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Preparation method of carbon fiber/sulfur composite positive material with multilevel structure

A composite cathode material and carbon fiber technology, applied in structural parts, battery electrodes, electrical components, etc., can solve problems such as poor electrochemical performance, achieve the effects of improving electrical conductivity, reducing graphitization temperature, and reducing raw material costs

Inactive Publication Date: 2014-08-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of poor electrochemical performance of existing carbon / sulfur composite cathode materials, and to provide a method for preparing multi-level structure carbon fiber / sulfur composite cathode materials

Method used

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  • Preparation method of carbon fiber/sulfur composite positive material with multilevel structure
  • Preparation method of carbon fiber/sulfur composite positive material with multilevel structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a multi-level structure carbon fiber / sulfur composite positive electrode material, the specific steps are:

[0029] 1) Dissolve 1 g of nickel nitrate and 1 g of polyacrylonitrile powder (number average molecular weight 150,000) in 10 g of N, N-dimethylformamide, and mix well to obtain a solution;

[0030] 2) Put the solution obtained in step 1) in the injector of the electrospinning apparatus, apply a high voltage of 20kV, and inject the solution at a speed of 0.1mm·min -1 ;

[0031] 3) moving the metal salt-containing film obtained in step 2) to a muffle furnace, and calcining in air at 250° C. for 2 hours to obtain a pre-oxidized film;

[0032] 4) Move the pre-oxidized film obtained in the step into a tube furnace, feed argon gas, and calcinate at 1600°C for 0.5h, and obtain a carbon fiber film containing metal salt after the reaction is completed;

[0033] 5) After the reaction is over, the carbon fiber film containing metal salt obtained in ...

Embodiment 2

[0038] A method for preparing a multi-level structure carbon fiber / sulfur composite positive electrode material, the specific steps are:

[0039] 1) Dissolve 0.1g of ferric nitrate and 3g of polyvinylpyrrolidone powder (number average molecular weight 1,300,000) in 10g of water, mix well to obtain a solution;

[0040] 2) Place the solution obtained in step 1) in the injector of the electrospinning apparatus, apply a high voltage of 12kV, and inject at a speed of 0.01mm·min -1 ;

[0041]3) moving the metal salt-containing film obtained in step 2) to a muffle furnace, and calcining in air at 100° C. for 4 hours to obtain a pre-oxidized film;

[0042] 4) Move the pre-oxidized film obtained in the step into a tube furnace, feed argon gas, and calcinate at 800° C. for 3 hours, and obtain a carbon fiber film containing metal salt after the reaction is completed;

[0043] 5) After the reaction is over, the carbon fiber film containing metal salt obtained in step 4) is added to 6mol...

Embodiment 3

[0048] A method for preparing a multi-level structure carbon fiber / sulfur composite positive electrode material, the specific steps are:

[0049] 1) Dissolve 1.5g of nickel acetate and 0.5g of polyethylene glycol powder (number average molecular weight: 1,000,000) in 10g of water, mix well to obtain a solution;

[0050] 2) Place the solution obtained in step 1) in the injector of the electrospinning apparatus, apply a high voltage of 25kV, and inject the solution at a speed of 0.2mm·min -1 ;

[0051] 3) moving the metal salt-containing film obtained in step 2) to a muffle furnace, and calcining in air at 300° C. for 0.5 h to obtain a pre-oxidized film;

[0052] 4) Move the pre-oxidized film obtained in the step into a tube furnace, feed argon gas, and calcinate at 600° C. for 6 hours, and obtain a carbon fiber film containing metal salt after the reaction is completed;

[0053] 5) After the reaction is over, the carbon fiber film containing metal salt obtained in step 4) is ...

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Abstract

The invention relates to a preparation method of a carbon fiber / sulfur composite positive material with a multilevel structure and belongs to the technical field of chemical engineering electrode material preparation processes. The preparation method comprises the steps of preparing a carbon fiber by an electrostatic spinning method, adding metal salt into a spinning solution, calcining in an inert atmosphere, catalyzing graphitization of the carbon fiber by virtue of a metal formed in situ on one hand, removing metal particles to form hollow carbon spheres by virtue of the metal formed in situ on the other hand, and then adsorbing sulfur into the graphitized hollow carbon spheres by virtue of a gas-phase thermal evaporation method. With the adoption of the carbon fiber / sulfur composite positive material with the multilevel structure, the rate capability of the material is greatly improved, the dissolution of polysulfide is also inhibited, and the cycle performance and the coulombic efficiency of the material are improved. The preparation method is simple and easy, is high in controllability of technological parameters and low in energy consumption and has a low equipment requirement.

Description

technical field [0001] The invention relates to a preparation method of a multi-level structure carbon fiber / sulfur composite positive electrode material, belonging to the technical field of chemical electrode material manufacturing technology. Background technique [0002] Today, with the rapid development of our country, environmental pollution and resource shortage have become the bottleneck restricting economic development. As an important part of clean energy, lithium-ion batteries are being used more and more widely. Among them, the lithium-sulfur battery has a high theoretical energy density of 2600Wh kg -1 , high theoretical capacity density 1675mAh g -1 , low cost, environmental friendliness and other advantages have received a lot of attention from people. However, the conductivity of the sulfur cathode is extremely low (the conductivity of pure sulfur is less than 10 -30 S / cm), and soluble polysulfides will be formed during the charging and discharging process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCH01M4/366H01M4/38H01M4/625H01M10/0525Y02E60/10
Inventor 穆道斌吴锋石丽丽吴伯荣陈实许洪亮鲍澄宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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