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Macroporous carbon/oxide zinc/sulfur composite material for lithium-sulfur battery as well as preparation method and application of macroporous carbon/oxide zinc/sulfur composite material

A composite material, lithium-sulfur battery technology, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve the problem of active sulfur loss, achieve strong adsorption, improve rate performance and cycle performance, and the effect of improving utilization

Active Publication Date: 2018-07-24
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method that can be used for the macroporous carbon / zinc oxide / sulfur composite material of lithium-sulfur battery, particularly lithium-sulfur battery cathode material, described macroporous carbon / zinc oxide / sulfur composite material can effectively Solve the problems of the loss of active sulfur and the shuttle effect of the positive electrode material in lithium-sulfur batteries, so as to improve the electrochemical performance and cycle stability of lithium-sulfur batteries as a whole

Method used

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  • Macroporous carbon/oxide zinc/sulfur composite material for lithium-sulfur battery as well as preparation method and application of macroporous carbon/oxide zinc/sulfur composite material
  • Macroporous carbon/oxide zinc/sulfur composite material for lithium-sulfur battery as well as preparation method and application of macroporous carbon/oxide zinc/sulfur composite material
  • Macroporous carbon/oxide zinc/sulfur composite material for lithium-sulfur battery as well as preparation method and application of macroporous carbon/oxide zinc/sulfur composite material

Examples

Experimental program
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Embodiment 1

[0047] 1) Preparation of monodisperse silica microspheres:

[0048] The n-disilicate ethyl silicate and absolute ethanol solution were mixed together according to the volume ratio of 1:15. In addition, mix concentrated ammonia water, absolute ethanol, and deionized water together at a volume ratio of 1:3:15. The two groups of solutions were mixed together, stirred with a magnetic stirrer for 12 hours, then centrifuged, and dried in a vacuum oven for 12 hours to obtain silica microspheres with a diameter of 200-300 nm.

[0049] 2) Preparation of silica template:

[0050] Take an appropriate amount of the above-mentioned silica microspheres and grind them into powder, make a 10wt% solution with ethanol solution, put it in a beaker, and ultrasonicate it, so that the silica microspheres are evenly dispersed in the ethanol solution, and then make it at 40°C After standing still, after volatilization and drying, neatly arranged SiO 2 template.

[0051] 3) Preparation of 3D order...

Embodiment 2

[0058] This embodiment is the second embodiment of preparing macroporous carbon / zinc oxide / sulfur composite material, and the difference from embodiment 1 is that in the step of preparing silica microspheres, ethyl n-disilicate and no The water-ethanol solution is mixed together according to the volume ratio of 1:25, and the concentrated ammonia water, absolute ethanol and deionized water are mixed together according to the volume ratio of 1:3:15.

[0059] Other preparation methods and parameters are the same as in Example 1.

Embodiment 3

[0061] This embodiment is the 3rd embodiment that prepares the macroporous carbon / zinc oxide / sulfur composite material, and the difference with embodiment 1 is, in the step of preparing silicon dioxide microspheres, ethyl n-disilicate and no The water-ethanol solution is mixed together according to the volume ratio of 1:15, and the concentrated ammonia water, absolute ethanol and deionized water are mixed together according to the volume ratio of 1:5:20.

[0062] Other preparation methods and parameters are the same as in Example 1.

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Abstract

The invention provides a macroporous carbon / oxide zinc / sulfur composite material for a lithium-sulfur battery as well as a preparation method and application of the macroporous carbon / oxide zinc / sulfur composite material. The preparation method comprises the following steps: S1, preparing a mixed solution containing a macroporous carbon material and Zn(COOH)2, adding a strong alkaline solution at40 to 80 DEG C, stirring the mixed solution and the strong alkaline solution, maintaining the temperature at 40 to 80 DEG C, and centrifugating and drying the solution after the reaction is completed,thus obtaining a macroporous carbon / oxide zinc material; and with CS2 as a solvent, grinding the macroporous carbon / oxide zinc material and elemental S, and then adding the mixture into a reaction kettle for heating reaction for 10 to 24 hours at reaction temperature of 100 to 300 DEG C. By use of macroporous carbon and zinc oxide, the macroporous carbon / oxide zinc / sulfur composite material provided by the invention overcomes the shortcomings of low conductivity and a shuttle effect due to the fact that sulfur is used as a battery anode material; when the macroporous carbon / oxide zinc / sulfurcomposite material is applied to an anode of the lithium-sulfur battery, the rate performance and the cycle performance of the lithium-sulfur battery can be effectively improved.

Description

technical field [0001] The present invention relates to the technical field of cathode materials for lithium-sulfur batteries, and more specifically, relates to a macroporous carbon / zinc oxide / sulfur composite material that can be used in lithium-sulfur batteries and its preparation method and application. Background technique [0002] With the rapid development of society and economy, people's demand for energy is also increasing day by day. Human life is increasingly dependent on fossil fuels, which leads to serious environmental problems and human survival problems such as the global energy crisis and the greenhouse effect. Therefore, vigorously developing renewable energy has become an inevitable trend. Renewable energy includes wind energy, tidal energy, nuclear energy, solar energy, etc. These energy sources have no pollution to the environment and are inexhaustible. It is extremely susceptible to the influence of various factors such as weather and seasons, and cannot...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张永光王新钊妍
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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