Composite material preparation method and application of phosphorus-containing small molecule functionalized carbon nanotubes
A technology of composite materials and carbon nanotubes, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low utilization rate of active materials, hindering the process of practical application, and poor cycle performance, so as to achieve easy mass production and suppress Shuttle effect, performance-enhancing effect
Active Publication Date: 2021-09-07
WENZHOU UNIV
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However, lithium polysulfides formed during charging and discharging of lithium-sulfur batteries are easily soluble in liquid electrolytes, causing shuttle effects, volume expansion during charging and discharging, and corrosion of metal lithium, resulting in low utilization of active materials in lithium-sulfur batteries. , low coulombic efficiency, and poor cycle performance seriously hinder its practical application
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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0030] Preparation of tris(4-fluorophenylphosphine) functionalized carbon nanotube cathode material (CNTs-S-TFPP) and its application in lithium-sulfur batteries
[0031] (1), preparation of multi-walled carbon nanotubes / S composite material: take 200mg of the above-mentioned CNTs and 200mg of elemental sulfur in a mortar, fully grind the porous carbon and sulfur evenly, transfer the resulting mixture to a 25ml weighing bottle, and add 3.2mL 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 multi-walled carbon nanotubes@sulfur composite material;
[0032] (2) Preparation of multi-walled carbon nanotubes / S (CNTs-S) cathode ma...
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The invention provides a composite material preparation method and application of phosphorus-containing small molecule functionalized carbon nanotubes. The preparation method is: a carbon nanotube sulfur-loaded composite material, triphenylphosphine and derivative reagents thereof, and PVDF adding solvent N-formazan In the base pyrrolidone, stir and ultrasonically disperse evenly, control the viscosity at 1000-10000cps to obtain a composite material slurry; use a spreader to evenly paint the obtained composite material slurry on the surface of the aluminum foil with a thickness of 100-400mm, and then apply it at 40-10000cps drying in an oven at 60°C to obtain the anode material of phosphorus-containing small molecule functionalized carbon nanotubes; Large-scale production; the prepared cathode material of phosphorus-containing small molecule functionalized carbon nanotubes is used in lithium-sulfur batteries, which can solve the dissolution of polysulfide ions in the liquid electrolyte during the charging and discharging process of lithium-sulfur batteries, and effectively inhibit the shuttle effect , to improve the Coulombic efficiency and cycle stability of lithium-sulfur batteries.
Description
technical field [0001] The invention belongs to the research field of nanocomposite materials, and in particular relates to a phosphorus-containing small molecule functionalized carbon nanotube positive electrode material for lithium-sulfur batteries and a preparation method thereof. The phosphorus-containing small molecule functionalized carbon nanotube positive electrode material can be Remember CNTs-S-TFPP. Background technique [0002] With the rapid economic development and increasing energy consumption, the depletion of fossil fuel reserves and the environmental pollution caused by combustion have made 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 development strategy of human beings, so it is very popular. Since its commercialization in 1991, lithium-ion batteries have b...
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IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M10/052
CPCY02E60/10
Inventor 杨植赖玉崇聂华贵丁欣慰禅丹张永贵周苏雅黄少铭
Owner WENZHOU UNIV