Cathode material for long-circulation lithium-sulfur battery and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, nanotechnology for materials and surface science, etc., can solve the problems of low conductivity and affect the electrode rate performance, etc. Coulombic efficiency and cycle performance, the effect of improving electrochemical activity

Inactive Publication Date: 2017-02-01
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of commonly used oxide materials is generally low, so it will affect the rate performance of the electrode to a certain extent.
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Method used

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  • Cathode material for long-circulation lithium-sulfur battery and preparation method thereof
  • Cathode material for long-circulation lithium-sulfur battery and preparation method thereof
  • Cathode material for long-circulation lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0054] Example 1

[0055] The first preparation method (melting compound method) of a composite material of sulfur / manganese dioxide / graphene oxide / carbon nanotubes with a three-dimensional structure.

[0056] Step 1: Take 1g of carbon nanotubes and disperse them in a concentrated acid solution (volume ratio of concentrated nitric acid to concentrated sulfuric acid 1:3). The ratio of carbon nanotubes to concentrated acid is 1:10-100 by mass (preferably 1:50) ), after 10 minutes of ultrasonic dispersion, change to magnetic stirring at room temperature for 1 hour, raise the temperature to 70℃, and stir for 4 hours to perform nano-exfoliation on the surface of carbon nanotubes. This step can be used to remove impurities in carbon nanotubes and graft oxygen. Chemical functional groups;

[0057] Step 2: Lower the temperature of the above solution to 0°C, add 5mL concentrated sulfuric acid and continue stirring for 30min, then increase the temperature to 55°C, and add 3g potassium permang...

Example Embodiment

[0059] Example 2

[0060] The second preparation method (solvent exchange method) of a composite material of sulfur / manganese dioxide / graphene oxide / carbon nanotubes with a three-dimensional structure.

[0061] The first and second steps are the same as in Example 1;

[0062] The third step: Take 1g of the above-mentioned manganese dioxide / graphene oxide / carbon nanotube composite material, disperse it in carbon disulfide solution, add 3g of sulfur powder to the above-mentioned dispersion liquid, airtightly stir for 2h, and then place it in a fume hood and Stir at 50℃ until carbon disulfide is completely volatilized, and a three-dimensional structure of sulfur / manganese dioxide / graphene oxide / carbon nanotube composite material (MnO 2 / GO / CNTs-S).

Example Embodiment

[0063] Example 3

[0064] The third preparation method (in-situ solution precipitation method) of a composite material of sulfur / manganese dioxide / graphene oxide / carbon nanotubes with a three-dimensional structure.

[0065] The first and second steps are the same as in Example 1;

[0066] The third step: Take 1g of the above-mentioned manganese dioxide / graphene oxide / carbon nanotube composite material, disperse it in 200mL deionized water, sonicate for 30min, add 100mL of 1mol / L sodium polysulfide solution to the solution, continue to stir for 1h, Then add 200 mL of 1mol / L hydrochloric acid dropwise to the above dispersion, filter and dry, and obtain a three-dimensional structure of sulfur / manganese dioxide / graphene oxide / carbon nanotube composite material (MnO 2 / GO / CNTs-S).

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Abstract

The invention discloses a cathode material for a long-circulation lithium-sulfur battery and a preparation method thereof. The cathode material is compounded from the following materials: a three-dimensional metallic oxide or metallic sulfide/carbon composite material and a sulfur-containing material, wherein the three-dimensional metallic oxide or metallic sulfide/carbon composite material is compounded from the following materials: a metallic oxide or metallic sulfide, and a carbon composite material. The carbon composite material is a nanocarbon composite material, with a two-dimensional structure, compounded by a one-dimensional material and a two-dimensional material. The sulfur-containing material is elemental sulfur or a polysulfide containing a -Sm- structure in which m is greater than 2. The cathode material for the long-circulation lithium-sulfur battery prepared in the invention has high conductivity and a three-dimensional space structure, the coulombic efficiency and cycle performance of the lithium-sulfur battery can be improved effectively, and meanwhile the cathode material has excellent rate capability.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium-sulfur battery, in particular to a positive electrode material for a long-cycle lithium-sulfur battery and a preparation method thereof. Background technique [0002] With the rapid development of society, whether it is the civilian market represented by electric vehicles, smart grids and energy storage power stations, or the military field represented by satellites and drones, the energy density of batteries is getting higher and higher. demand. Due to the advantages of low cost, environmental friendliness, and high energy density, lithium-sulfur batteries have become a research hotspot and become the representative of the next generation of high specific energy lithium batteries. [0003] Lithium-sulfur batteries also have some disadvantages that hinder their industrialization. For example, the conductivity of the positive electrode active material sulfur is low, the charge and di...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/364H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 李永裴海娟刘雯郭瑞解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
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