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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

AI Technical Summary

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.
Therefore, the controlled preparation of composite sulfur cathode materials with excellent cycle performance and rate capability is still a great challenge.

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

Embodiment 1

[0055] The first preparation method (melt composite 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 is 1:3). ), after ultrasonic dispersion for 10 min, change to magnetic stirring at room temperature for 1 h, raise the temperature to 70 ° C, and stir for 4 h to carry out nano-exfoliation of the surface of carbon nanotubes. This step can be used to remove impurities in carbon nanotubes and graft oxygen-containing chemical functional groups;

[0057] Step 2: Lower the temperature of the above solution to 0°C, add 5mL of concentrated sulfuric acid and continue to stir for 30min, then raise the temperature to 55°C, add 3g of potassium permanganate, continue to stir for 120min, raise the temperature to 90°C and stir for 10min, and finally ...

Embodiment 2

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

[0061] The first step and second step are identical with embodiment 1;

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

Embodiment 3

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

[0065] The first step and second step are identical with embodiment 1;

[0066] Step 3: Take 1 g of the above manganese dioxide / graphene oxide / carbon nanotube composite material, disperse it in 200 mL of deionized water, ultrasonicate for 30 min, add 100 mL of 1 mol / L sodium polysulfide solution to the solution, and continue stirring for 1 h, Then add 200mL of 1mol / L hydrochloric acid dropwise to the above-mentioned dispersion liquid, filter and dry to obtain the 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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