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Sulfur-loaded hollow nano polyhedron octasulfide nine cobalt/carbon fiber composite material and preparation method and application thereof

A composite material and carbon fiber technology, applied in the direction of positive electrode, active material electrode, structural parts, etc., can solve the problems of poor conductivity, short service life, low battery cycle performance, etc., and achieve stable performance, low requirements for equipment, and restraint The effect of the shuttle effect

Pending Publication Date: 2022-03-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a sulfur-loaded hollow nanopolyhedral nona-cobalt octasulfide / carbon fiber composite material and its preparation method and use, which are used to solve the problem of lithium-sulfur batteries in the prior art. Poor electrical conductivity of the positive electrode, low battery cycle performance and short service life. Through research on the sulfur positive electrode material, it has excellent electrical conductivity, strong chemical adsorption and special physical structure to limit the pulverization of sulfur , to avoid the collapse of the positive electrode structure, to achieve high stability and high cycle capacity of lithium-sulfur batteries

Method used

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  • Sulfur-loaded hollow nano polyhedron octasulfide nine cobalt/carbon fiber composite material and preparation method and application thereof
  • Sulfur-loaded hollow nano polyhedron octasulfide nine cobalt/carbon fiber composite material and preparation method and application thereof
  • Sulfur-loaded hollow nano polyhedron octasulfide nine cobalt/carbon fiber composite material and preparation method and application thereof

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Embodiment 1

[0046] In this embodiment, the preparation method of the hollow nanopolyhedron octahedral cobalt octasulfide / carbon fiber composite material loaded with sulfur is as follows:

[0047] 1) Dissolve 0.8g of cobalt nitrate hexahydrate in 20mL of methanol to obtain solution A;

[0048] 2) 0.8g of 2-methylimidazole was dissolved in 20mL of methanol to obtain solution B;

[0049] 3) Pour solution B into solution A quickly, stir for 30 seconds, put in carbon fiber cloth and soak for 12 hours, the mass ratio between carbon fiber, cobalt nitrate hexahydrate and 2-methylimidazole is 1:60:70, take out carbon fiber cloth, washed with ethanol, and dried at 50°C for 18 hours to obtain a ZIF-67 / carbon fiber composite material;

[0050] 4) Put the ZIF-67 / carbon fiber composite material prepared in step 3) into 0.04mol / L thioacetamide ethanol solution for hydrothermal reaction, the mass ratio of ZIF-67 / carbon fiber composite material to thioacetamide The ratio is 1:20; the temperature of hydr...

Embodiment 2

[0053] In this embodiment, the preparation method of the hollow nanopolyhedron octahedral cobalt octasulfide / carbon fiber composite material loaded with sulfur is as follows:

[0054] 1) 1.2g of cobalt nitrate hexahydrate was dissolved in 20mL of methanol to obtain solution A;

[0055] 2) 1.0g of 2-methylimidazole was dissolved in 20mL of methanol to obtain solution B;

[0056] 3) Pour solution B into solution A quickly, stir for 3 minutes and mix, put into carbon fiber cloth for soaking reaction for 24 hours, the mass ratio between carbon fiber, cobalt nitrate hexahydrate and 2-methylimidazole is 1:60:70, Finally, the carbon fiber cloth was taken out, washed with ethanol, and dried at 65°C for 6 hours to obtain a self-supporting ZIF-67 / carbon fiber composite material;

[0057] 4) Put the ZIF-67 / carbon fiber composite material prepared in step 3) into the ethanol solution of 0.02mol / L thioacetamide for hydrothermal reaction, the mass ratio of ZIF-67 / carbon fiber composite mat...

Embodiment 3

[0060] In this embodiment, the preparation method of the hollow nanopolyhedron octahedral cobalt octasulfide / carbon fiber composite material loaded with sulfur is as follows:

[0061] 1) 1.4g of cobalt nitrate hexahydrate was dissolved in 20mL of methanol to obtain solution A;

[0062] 2) 1.4g of 2-methylimidazole was dissolved in 20mL of methanol to obtain solution B;

[0063] 3) Pour solution B into solution A quickly, stir for 1 min, and put it into carbon fiber cloth for soaking reaction for 24 hours. The mass ratio between carbon fiber, cobalt nitrate hexahydrate and 2-methylimidazole is 1:65:65. Finally, the carbon fiber cloth was taken out, washed with ethanol, and dried at 80°C for 2 hours to obtain a ZIF-67 / carbon fiber composite material;

[0064] 4) Put the ZIF-67 / carbon fiber composite material prepared in step 3) into the ethanol solution of 0.06mol / L thioacetamide for hydrothermal reaction, the mass ratio of ZIF-67 / carbon fiber composite material and thioacetami...

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Abstract

The invention provides a sulfur-loaded hollow nano polyhedron octasulfide nine-cobalt / carbon fiber composite material and a preparation method and application thereof, and the preparation method comprises the following steps: firstly growing a polyhedron ZIF-67 on a carbon fiber cloth substrate by adopting a self-template method, and then vulcanizing to obtain a Co9S8 / carbon fiber composite material. On one hand, the Co9S8 / carbon fiber composite material has a relatively large internal space inside, so that the loading quality of sulfur is ensured, and the volume expansion of a lithium polysulfide Li2Sx substance in the circulation process is buffered; on the other hand, the material can be strongly combined with polysulfide and limit outward diffusion of the polysulfide, and the porous shell is beneficial to transportation of Li < + > and electrons. And soaking the Co9S8 / carbon fiber composite material in a carbon disulfide solution of sulfur, drying, and performing sulfur fumigation to obtain the sulfur-loaded hollow nano-polyhedron octasulfide nine cobalt / carbon fiber composite material, and the carbon fiber cloth is used as a substrate, so that the overall conductivity is improved. The composite material positive electrode has high discharge capacity and high cycle stability due to the physical and chemical dual-function synergistic fixation effect.

Description

technical field [0001] The invention belongs to the field of synthesis of battery electrode materials, in particular to a sulfur-loaded hollow nano-polyhedral nonacobalt octasulfide / carbon fiber composite material and its preparation method and application. Background technique [0002] As an energy storage system with high energy conversion efficiency, low cost, no pollution, and long service life, lithium-ion secondary batteries have played a huge role in current production and life. However, the actual capacity and energy density of commercial lithium-ion batteries are currently small, which seriously restricts the development of electric vehicles, electronic products, smart grids and other industries. Demand, which prompts researchers to develop a more reasonable and effective battery energy system. Lithium-sulfur battery (Li-S battery) has an ultra-high theoretical energy density (2600Wh kg -1 ) and ultra-high theoretical capacity (1675mAh g -1 ), and sulfur is abund...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/583H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/5815H01M4/583H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 李金金林夕蓉刘金云
Owner SHANGHAI JIAO TONG UNIV
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