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
CN103972480AInactive Publication Date: 2014-08-06BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2014-08-06
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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