Silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material, preparation method and application thereof

A composite positive electrode material and silicon-based molecular sieve technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrical components, etc., can solve problems such as volume expansion of lithium metal that is prone to shuttle effect, utilization rate of corrosion active materials, poor cycle performance, etc. , to achieve the effect of improving Coulombic efficiency and cycle stability, improving discharge capacity and cycle stability, and improving performance

Inactive Publication Date: 2019-03-15
WENZHOU UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, lithium-sulfur batteries are prone to shuttle effect during charge and discharge, volume expansion and corrosion of metal lithium during charge and discharge, which lead to low utilization of active materials, low Coulombic efficiency, and poor cycle performance of lithium-sulfur batteries. Overcoming obstacles in the commercial application of lithium-sulfur batteries

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  • Silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material, preparation method and application thereof
  • Silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material, preparation method and application thereof
  • Silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material, preparation method and application thereof

Examples

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Embodiment 1

[0034] Preparation of titanium-silicon molecular sieve TS-1 and carbon tube sulfur-loaded composite cathode material and its application in lithium-sulfur batteries

[0035] (1) Preparation of carbon tube sulfur-loaded composite material: Take 200 mg of carbon tube and 200 mg of elemental sulfur in a mortar, thoroughly grind the porous carbon and sulfur evenly, transfer the resulting mixture to a 25 ml weighing bottle, and add 3.2 mL of CS 2 Stir well, wait until CS 2 After the volatilization is complete, transfer the mixture to an oven at 120°C for 12 hours, then cool to room temperature, and collect the resulting product to obtain the carbon tube sulfur-loaded composite material;

[0036] (2) Preparation of titanium-silicon molecular sieve TS-1 carbon tube sulfur-loaded composite positive electrode material: 300 mg of carbon tube-loaded sulfur composite material, 15 mg of conductive additive carbon black, 15 mg of binder polyvinylidene fluoride, and 10-20 mg of titanium-sili...

Embodiment 2

[0043] Preparation of Porous Silicon KIT‐6 Molecular Sieve and Carbon Tube Sulfur-loaded Composite Cathode Material and Its Application in Lithium-Sulfur Batteries

[0044] (1) Preparation of carbon tube sulfur-loaded composite material: take 200 mg of the above-mentioned carbon tube composite material and 400 mg of elemental sulfur in a mortar, fully grind the porous carbon and sulfur evenly, transfer the resulting mixture to a 25 ml weighing bottle, and Add 6mL CS 2 Stir well, wait until CS 2 After the volatilization is complete, transfer the mixture to an oven at 150°C for 10 hours, then cool to room temperature, and collect the resulting product to obtain the carbon tube sulfur-loaded composite material;

[0045] (2) Preparation of porous silicon KIT-6 molecular sieve carbon tube sulfur-loaded composite positive electrode material: 400 mg of carbon tube sulfur-loaded composite material, 50 mg of conductive additive carbon black, 50 mg of binder polyvinylidene fluoride, 5-...

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Abstract

The invention provides a silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material, a preparation method and an application thereof. The technical scheme is that the preparation method comprises the following steps: mixing and grinding a carbon tube and elemental sulfur, adding CS2 and fully stirring, after that, drying to obtain a carbon tube sulfur-loaded composite material; and mixing the carbon tube sulfur-loaded composite material with carbon black and polyvinylidene fluoride according to a certain mass ratio, then adding N-methylpyrrolidone and the silicon-based molecular sieve, stirring and performing ultrasonic dispersion to be uniform, controlling the viscosity to be 1,000 to 10,000cps to obtain slurry, uniformly coating the obtained slurry on acurrent collector aluminum foil with a thickness of 150 to 400mm, then transferring the aluminum foil to a drying oven at 40 to 60 DEG C to obtain the silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material. The preparation method disclosed by the invention is simple to operate and easy for large-scale production; the prepared silicon-based molecular sieve/carbon tube sulfur-loaded composite positive electrode material is used for a lithium-sulfur battery, so that the dissolution of polysulfide ions in liquid electrolyte in the charging and discharging process of the lithium-sulfur battery can be solved, a shuttle effect is effectively inhibited, and the coulombic efficiency and the cycling stability of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the research field of nanocomposite materials, and in particular relates to a silicon-based molecular sieve / carbon tube sulfur-loaded composite positive electrode material for improving the electrochemical performance of a lithium-sulfur battery and suppressing the shuttle effect of polysulfides, as well as its preparation method and its application in lithium-sulfur batteries. Applications in lithium-sulfur batteries. Background technique [0002] With the rapid economic development and the improvement of people's lifestyle, people's demand for energy is increasing day by day. However, the environmental pollution caused by fossil fuels and the depletion of their reserves make people's demand for new alternative energy sources more and more urgent. New energy, especially chemical energy, has the characteristics of cleanness, environmental protection, safety and efficiency, and meets the requirements of the sustainable developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 聂华贵禅丹杨植赖玉崇丁欣慰周苏雅张永贵林一鸣黄少铭
Owner WENZHOU UNIVERSITY
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