Porous carbon/sulfur composite material, its preparation method and application

A technology of porous carbon materials and composite materials, which is applied to porous carbon/sulfur composite materials and the fields of their preparation and application, can solve the problems of poor high rate performance and cycle performance, poor experimental repeatability, and complicated operation of sulfur-carbon composite materials. , to achieve the effect of suitable for large-scale production, easy availability of raw materials, and high degree of practicality

Active Publication Date: 2012-12-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current literature, most of the porous carbon materials are prepared by the template method, and then compounded with sulfur to prepare sulfur-carbon composite materials. This method has many steps, cumbersome operations, and poor experimental repeatability. and poor cycle performance

Method used

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  • Porous carbon/sulfur composite material, its preparation method and application
  • Porous carbon/sulfur composite material, its preparation method and application
  • Porous carbon/sulfur composite material, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, preparation porous carbon / sulfur composite material

[0030] Weigh the mixture of alginic acid and sodium hydroxide, the mass ratio of sodium hydroxide is 50%, add water, stir and mix evenly. The moisture was evaporated, and the mixture was heated at 700°C for 8h under a nitrogen atmosphere. After the reaction is complete, add 50% sulfuric acid aqueous solution, stir at room temperature for 24 hours, centrifuge and wash with water several times until neutral. Vacuum drying at 80°C yielded porous carbon. The mixture of porous carbon and sulfur powder was weighed, and the mass content of sulfur was 50%. After mixing evenly, it was heated at 120°C for 48h under an air atmosphere to obtain a porous carbon / sulfur composite material.

[0031] The scanning electron micrograph of the porous carbon / sulfur composite material prepared in this embodiment is as follows figure 1 shown.

[0032] Electrochemical performance characterization of porous carbon / sulfur com...

Embodiment 2

[0036] Embodiment 2, preparation porous carbon / sulfur composite material

[0037] Weigh the mixture of alginic acid and sodium hydroxide, the mass ratio of sodium hydroxide is 30%, add water, stir and mix evenly. The moisture was evaporated, and the mixture was heated at 850°C for 6h under a nitrogen atmosphere. After the reaction is complete, add 30% sulfuric acid aqueous solution, stir at room temperature for 36 hours, centrifuge and wash with water several times until neutral. Vacuum drying at 100°C yielded porous carbon. Weigh the mixture of porous carbon and sulfur powder, the mass content of sulfur is 45%, after mixing evenly, heat at 250°C for 10h under air atmosphere to obtain porous carbon / sulfur composite material.

[0038] The electrochemical performance of the obtained porous carbon / sulfur composite material was tested according to the method in Example 1, and the key experimental conditions and simulated battery test results for preparing the porous carbon / sulfu...

Embodiment 3

[0039] Embodiment 3, preparation porous carbon / sulfur composite material

[0040]Weigh the mixture of alginic acid and potassium hydroxide, the mass ratio of potassium hydroxide is 25%, add water, stir and mix evenly. The moisture was evaporated, and the mixture was heated at 900°C for 5h in an argon atmosphere. After the reaction is complete, add 20% aqueous nitric acid solution, stir at room temperature for 24 hours, centrifuge and wash with water several times until neutral. Drying at 150°C in an argon atmosphere yielded porous carbon. The mixture of porous carbon and sulfur powder was weighed, and the mass content of sulfur was 40%. After mixing evenly, it was heated at 160° C. for 36 h under an air atmosphere to obtain a porous carbon / sulfur composite material.

[0041] The electrochemical performance of the obtained porous carbon / sulfur composite material was tested according to the method in Example 1, and the key experimental conditions and simulated battery test res...

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Abstract

The invention discloses a porous carbon / sulfur composite material and its preparation method. The method comprises the following steps of: (1) adding water into a mixture of alginic acid and a metal hydroxide, and stirring them uniformly to obtain a reaction solution; (2) evaporating the water of the reaction solution, and then conducting heating under a non-oxidizing atmosphere so as to obtain a porous carbon material precursor; (3) treating the porous carbon material precursor with water or an acid solution, then drying the precursor so as to obtain a porous carbon material; and (4) heating a mixture of the porous carbon material and sulfur powder, thus obtaining the porous carbon / sulfur composite material. The invention also provides application of the porous carbon / sulfur composite material as a battery electrode material, especially its application as a lithium sulfur battery positive electrode material. Compared with the prior art, the preparation method of the porous carbon / sulfur composite material provided in the invention has the advantages of simple preparation method, easily available raw materials, suitability for mass production, and high degree of utility. The porous carbon / sulfur composite material provided in the invention can be directly used as a battery electrode material.

Description

technical field [0001] The invention relates to a porous carbon / sulfur composite material and its preparation method and application. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronics, electric vehicles, and plug-in hybrid electric vehicles, there is an urgent need to develop batteries with higher energy density. Due to the limitation of improving the capacity of the positive electrode material of lithium-ion batteries, it is difficult to further increase the energy density of lithium-ion batteries. At the same time, increasing the energy density by increasing the voltage platform of the cathode material will bring safety problems. Changing the cathode material from the "deintercalation mechanism" to the "conversion reaction chemical mechanism" is expected to obtain materials with high specific capacity and specific energy. Elemental sulfur is one of the most promising materials. Sulfur reacts completely with li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 郭玉国郭维殷雅侠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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