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Carbon carrier, preparation method thereof and application in lithium-sulfur battery

A technology of carbon carrier and carbon layer, which is applied in the application field of carbon carrier and lithium-sulfur battery, can solve the problem of sulfur element falling off, achieve the effect of improving adsorption characteristics, maintaining cycle performance and rate performance

Inactive Publication Date: 2017-11-24
DONGGUAN UNIV OF TECH
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  • Claims
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Problems solved by technology

[0007] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a carbon carrier, its preparation method and application in lithium-sulfur batteries, aiming to solve the problem that sulfur element falls off from the carbon carrier during the cycle

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  • Carbon carrier, preparation method thereof and application in lithium-sulfur battery
  • Carbon carrier, preparation method thereof and application in lithium-sulfur battery
  • Carbon carrier, preparation method thereof and application in lithium-sulfur battery

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Embodiment Construction

[0037] The invention provides a carbon carrier, its preparation method and its application in lithium-sulfur batteries. In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0038] Such as figure 1 Shown is the carbon support preparation method of the specific embodiment of the present invention. The preparation method comprises the following steps:

[0039] 100. After mixing the carbon source and the nitrogen source according to a predetermined ratio, they are stirred and dissolved in water. The specific ratio of nitrogen source and carbon source can be adjusted according to actual conditions by those skilled in the art.

[0040] 200. Add mineral...

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Abstract

The invention discloses a carbon carrier, a preparation method thereof and application in a lithium-sulfur battery. The preparation method comprises the steps of A, mixing a carbon source and a nitrogen source according to a preset proportion and then performing stirring and dissolving in water; B, adding inorganic acid into the solution obtained in the step A to generate a precipitant; and C, collecting the precipitant obtained in the step B, and performing two-step roasting under protection of inert gas to prepare the carbon carrier. In the obtained carbon carrier, the electron structure of carbon is changed due to doping of nitrogen, sulfur and edge carbon, so that the carbon carrier has certain pole characteristic, the absorption characteristic of the carbon on the sulfur can be effectively improved, the cycle property and the rate performance of the battery can be maintained under the condition of high sulfur carrying capacity; and the whole preparation method can be achieved through biomass and is simple and easy to amplify.

Description

technical field [0001] The invention relates to the technical field of carbon materials, in particular to a carbon carrier, its preparation method and its application in lithium-sulfur batteries. Background technique [0002] As a cathode material for lithium-ion batteries, sulfur has the advantages of high specific capacity (2600 Wh / kg) and low price, and is an important development direction for high specific energy secondary batteries. However, when sulfur is used as the cathode material, there are several problems such as low electrical conductivity, dissolution of polysulfides, and shuttling of polysulfides. [0003] These problems lead to faster capacity fading, low Coulombic efficiency, and poor rate performance of lithium-sulfur batteries. In order to avoid the above-mentioned problems and improve the performance of lithium-sulfur batteries, various carbon supports for composite sulfur electrodes, such as graphene, carbon nanotubes, mesoporous carbon or other conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/052
CPCH01M4/362H01M4/38H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 金具涛乔校畅范洪波崔立峰
Owner DONGGUAN UNIV OF TECH
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