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Preparation method for lithium-sulfur battery composite cathode material

A composite cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low utilization rate of cathode active materials, rapid capacity decay, short cycle life, etc., and achieve excellent cycle stability. performance, low cost, and improved electrochemical performance

Inactive Publication Date: 2019-03-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the physical properties of sulfur itself, its conductivity at room temperature is very poor, so that sulfur cannot be directly used as an electrode material to match the lithium electrode to play its theoretical capacity and advantages. At the same time, the volume of lithium-sulfur batteries expands during charging and discharging. Obviously, the dissolution of polysulfides and the shuttle between the two electrodes of the reaction intermediate products also make the combination of sulfur cathode materials and general conductive carbon materials not completely solve the problem, and there are rapid capacity decay and low utilization of cathode active materials. Problems such as poor rate performance and short cycle life make the application of lithium-sulfur batteries have higher requirements for composite framework materials, which are also the difficulties and constraints for lithium-sulfur batteries to be truly applied.

Method used

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  • Preparation method for lithium-sulfur battery composite cathode material
  • Preparation method for lithium-sulfur battery composite cathode material
  • Preparation method for lithium-sulfur battery composite cathode material

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Embodiment 1

[0023] A method for preparing a lithium-sulfur battery composite positive electrode material, specifically comprising the following steps:

[0024] (1) Add cobalt nitrate hexahydrate and carbon nanotubes to methanol, the mass ratio of cobalt nitrate hexahydrate and carbon nanotubes is 10:1, and the total mass fraction of cobalt nitrate hexahydrate and carbon nanotubes is 1wt% The mixed solution was stirred with a magnetic stirrer combined with ultrasonic dispersion for 30min to obtain a mixed solution A; 2-methylimidazole was added to methanol to obtain a solution with a mass fraction of 2-methylimidazole of 1.4wt%, and then magnetically stirred Stirring combined with ultrasonic dispersion for 30 minutes to obtain mixed solution B, the magnetic stirring speed of magnetic stirrer stirring combined with ultrasonic dispersion was 600r / min, and the ultrasonic power was 400W;

[0025] (2) The mixed solution A and the mixed solution B of step (1) are quickly mixed together according...

Embodiment 2

[0033] A method for preparing a lithium-sulfur battery composite positive electrode material, specifically comprising the following steps:

[0034] (1) Add cobalt nitrate hexahydrate and carbon nanotubes to methanol, the mass ratio of cobalt nitrate hexahydrate and carbon nanotubes is 10:1, and the total mass fraction of cobalt nitrate hexahydrate and carbon nanotubes is 1.2wt % of the mixed solution, then stirred with a magnetic stirrer combined with ultrasonic dispersion for 30min to obtain a mixed solution A; 2-methylimidazole was added to methanol to obtain a solution with a mass fraction of 1.5wt% of 2-methylimidazole, and then magnetic Stirring with a stirrer combined with ultrasonic dispersion for 30 minutes to obtain a mixed solution B. The magnetic stirring speed of the magnetic stirrer combined with ultrasonic dispersion was 1000r / min, and the ultrasonic power was 400W;

[0035] (2) The mixed solution A and the mixed solution B of step (1) are quickly mixed together ...

Embodiment 3

[0040] A preparation method of a lithium-sulfur battery composite positive electrode material, specifically comprising the following steps:

[0041] (1) Add cobalt nitrate hexahydrate and carbon nanotubes into methanol, the mass ratio of cobalt nitrate hexahydrate and carbon nanotubes is 10:2, and the total mass fraction of cobalt nitrate hexahydrate and carbon nanotubes is 1.5wt % mixed solution, and then stir with a magnetic stirrer combined with ultrasonic dispersion for 30 min to obtain mixed solution A; add 2-methylimidazole to methanol to obtain a solution with a mass fraction of 2-methylimidazole of 1.2 wt%, and then use a magnetic Stirrer stirring combined with ultrasonic dispersion for 30min, to obtain mixed solution B, the magnetic stirring speed of magnetic stirrer stirring combined with ultrasonic dispersion is 700r / min, and the ultrasonic power is 550W;

[0042] (2) The mixed solution A and the mixed solution B of step (1) are rapidly mixed together according to t...

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Abstract

The invention discloses a preparation method for a lithium-sulfur battery composite cathode material. The preparation method comprises the following steps: adding cobalt nitrate hexahydrate and carbonnano tubes into methanol, adding 2-methylimidazole into methanol, rapidly mixing the two kinds of solution together, standing and ageing at room temperature, after centrifugal separation washing anddrying are performed, performing heat preservation in an argon atmosphere, then performing heat treatment in a carbon dioxide atmosphere, and performing furnace cooling to room temperature in the argon atmosphere, so that the lithium-sulfur battery composite cathode material is obtained. The prepared lithium-sulfur battery composite cathode material has the advantages of small particle size, uniformity, large specific surface area and electrical conductivity; and the material has relatively high specific discharge capacity and excellent cycling stability.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery composite cathode material, belonging to the technical field of lithium batteries. Background technique [0002] Energy is the lifeblood of the development of today's society. The depletion of fossil fuels and serious environmental pollution make the storage and application of new energy an important research hotspot. As an important energy storage system, lithium batteries have attracted much attention in the field of new energy technology. At present, the development of new energy technologies such as electric vehicles has put forward higher requirements for lithium batteries, among which energy density and power density are aspects that need special attention. The energy density of lithium batteries is mainly determined by the energy density of electrode materials. [0003] Due to the limitations of the theoretical specific capacity and energy density of materials, there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 张正富徐嘉辉范苏晓任艳昆
Owner KUNMING UNIV OF SCI & TECH