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A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in lithium batteries, battery electrodes, positive electrodes, etc., to achieve the effect of rich pore structure, good cycle stability, and large specific surface area

Active Publication Date: 2022-06-24
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a lithium-sulfur battery cathode material and a preparation method thereof, as a host material of sulfur, aiming at improving the conductivity of the sulfur cathode and alleviating its volume expansion during charging and discharging problems, while addressing the impact of the "shuttle effect"

Method used

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  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

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Embodiment 1

[0060] Zinc nitrate hexahydrate and 2-methylimidazole were dissolved in 100 mL of methanol at a molar ratio of 1:5, respectively, and stirred at room temperature to obtain a stable solution. Then the two solutions were mixed and magnetically stirred for 0.5 h. 400r·min -1 , and finally stand for 24h to get ZIF-8. The sample was washed several times with ethanol, and then transferred to a 75°C oven to dry to obtain pure ZIF-8, such as figure 1 shown.

Embodiment 2

[0062] The ZIF-8 obtained in Example 1 was used, and the mass ratio of trithiocyanuric acid, ZIF-8 and polyacrylonitrile was 0.25:1:1, dissolved in 15 mL of N-N dimethylformamide (DMF) solution, and stirred for 12 h to obtain Homogeneous spinning solution. The spinning solution was injected into the electrospinning device, and the voltage, temperature, distance from the needle to the receiving plate and liquid feeding speed were set, and electrospinning was performed to obtain a polyacrylonitrile / ZIF-8 film. The residual DMF solvent was removed by drying in a vacuum oven at 75°C for 2 h. The polyacrylonitrile / ZIF-8 film was placed in a tube furnace, kept at 240 °C for 2 h in an air atmosphere, and then heated in N. 2 Incubate at 800°C for 6h in an atmosphere. Immerse the sample in 3 mol L -1 The residual elemental zinc in the sample was removed in the HCl solution to obtain SN-PCNF-1 with a morphology as follows figure 2 shown.

Embodiment 3

[0064] ZIF-8 obtained in Example 1 was used, and the mass ratio of trithiocyanuric acid, ZIF-8 and polyacrylonitrile was 0.25:1:2, dissolved in 15 mL of N-N dimethylformamide (DMF) solution, and stirred for 12 h to obtain a uniform solution. spinning solution. Then, the spinning solution was injected into the electrospinning device, and the voltage, temperature, distance from the needle to the receiving plate, and liquid feeding speed were set, and electrospinning was performed to obtain a polyacrylonitrile / ZIF-8 film. The residual DMF solvent was removed by drying in a vacuum oven at 75°C for 2 h. The polyacrylonitrile / ZIF-8 film was placed in a tube furnace, kept at 240 °C for 2 h in an air atmosphere, and then heated in N. 2 Incubate at 800°C for 6h in an atmosphere. Immerse the sample in 3 mol L -1 The residual elemental zinc in the sample was removed in the HCl solution to obtain SN-PCNF-2 with a morphology like image 3 shown.

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Abstract

The invention discloses a lithium-sulfur battery cathode material and a preparation method thereof. The method includes: providing a metal-organic framework material; dissolving the metal-organic framework material, a sulfur source, and a polymer in a solvent, stirring for 1-12 hours, and controlling the temperature at 0-30°C to obtain a spinning solution; electrostatically dissolving the spinning solution The polymer / metal-organic framework film is obtained by spinning; the film is subjected to pre-oxidation, carbonization and acid solution treatment in sequence to obtain porous carbon nanofibers co-doped with sulfur and nitrogen; the porous carbon nanofibers are mixed with sulfur powder, and the Heating and keeping it warm for 1-12 hours under an inert atmosphere to obtain the positive electrode material of the lithium-sulfur battery. The sulfur and nitrogen co-doped porous carbon nanofiber obtained by the preparation method of the invention has a large specific surface area and abundant pore structure. After loading sulfur, it can be used as the positive electrode of lithium-sulfur batteries, which not only improves the conductivity of the sulfur electrode, alleviates the impact of the volume expansion of sulfur, but also effectively inhibits the shuttle effect of sulfur.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium-sulfur batteries, in particular to a positive electrode material for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] Problems such as environmental pollution and depletion of fossil energy are increasing, and lithium-ion batteries with long cycle life and high energy density are considered as an effective way to solve these problems. However, the theoretical energy density of Li-ion batteries based on "intercalation" electrochemistry is only 387 W h kg -1 . In this case, the lithium-sulfur battery (Li-S) based on the "conversion" electrochemical mechanism is due to its high specific capacity (1675 mA h g -1 ) and energy density (2600W h kg -1 ) and received a lot of attention. In addition, sulfur also has the advantages of economy, environmental protection and abundant resources. However, the practical application of Li-S batteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/052D04H1/728D01D5/00B82Y30/00B82Y40/00
CPCH01M4/364H01M4/38H01M4/583H01M4/625H01M10/052D04H1/728D01D5/0015B82Y30/00B82Y40/00H01M2004/028Y02E60/10
Inventor 米宏伟罗锋杨晓丹张培新
Owner SHENZHEN UNIV
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