Lithium-sulfur battery positive electrode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in lithium batteries, battery electrodes, positive electrodes, etc., to achieve the effects of inhibiting the shuttle effect, enriching the pore structure, and good cycle stability

Active Publication Date: 2019-12-13
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 ma

Method used

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  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0060] Dissolve zinc nitrate hexahydrate and 2-methylimidazole respectively in 100mL of methanol at a molar ratio of 1:5, stir at room temperature to obtain a stable solution, then mix the two solutions, stir magnetically for 0.5h, and rotate at a speed of 400r·min -1 , and finally left to stand for 24h to obtain ZIF-8. The sample was washed several times with ethanol, transferred and dried in an oven at 75°C to obtain pure ZIF-8, as figure 1 shown.

Embodiment 2

[0062] Using ZIF-8 obtained in Example 1, according to the mass ratio of trithiocyanuric acid, ZIF-8 and polyacrylonitrile of 0.25:1:1, dissolved in 15mL N-N dimethylformamide (DMF) solution, stirred for 12h, obtained Uniform spinning solution. The spinning liquid is injected into the electrospinning device, and the voltage, temperature, distance from the needle to the receiving plate and the liquid feeding speed are set, and electrospinning is performed to obtain a polyacrylonitrile / ZIF-8 film. Dry in a vacuum oven at 75 °C for 2 h to remove residual DMF solvent. 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 6 hours under air. Soak the sample in 3mol L -1 The elemental zinc remaining in the sample was removed by HCl solution to obtain SN-PCNF-1 with the morphology as figure 2 shown.

Embodiment 3

[0064] Using the ZIF-8 obtained in Example 1, according to the mass ratio of trithiocyanuric acid, ZIF-8 and polyacrylonitrile at 0.25:1:2, dissolve it in 15mL N-N dimethylformamide (DMF) solution, stir for 12h to obtain a uniform spinning solution. Then inject the spinning liquid into the electrospinning device, set the voltage, temperature, the distance from the needle to the receiving plate and the liquid feeding speed, and perform electrospinning to obtain the polyacrylonitrile / ZIF-8 film. Dry in a vacuum oven at 75 °C for 2 h to remove residual DMF solvent. 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 6 hours under air. Soak the sample in 3mol L -1 HCl solution removes the residual elemental zinc in the sample to obtain SN-PCNF-2 with the morphology as image 3 shown.

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Abstract

The invention discloses a lithium-sulfur battery positive electrode material and a preparation method thereof. The method comprises the steps of 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 DEG C to obtain a spinning solution; carrying out electrostatic spinning on the spinning solution to obtain a polymer/metal organic framework film; sequentially carrying out pre-oxidation, carbonization and acid solution treatment on the film to obtain sulfur and nitrogen co-doped porous carbon nanofibers; and mixing the porous carbon nanofibers with sulfur powder, and heating and preserving heat for 1-12 hours in an inert atmosphere to obtain thelithium-sulfur battery positive electrode material. The sulfur and nitrogen co-doped porous carbon nanofiber prepared by adopting the preparation method has a large specific surface area and a rich pore structure. The lithium-sulfur battery positive electrode material serves as the positive electrode of a lithium-sulfur battery after being loaded with sulfur, which not only improves the conductivity of the sulfur electrode and relieves the influence caused by volume expansion of sulfur, but also can effectively inhibit the shuttle effect of sulfur.

Description

technical field [0001] The invention relates to the field of lithium-sulfur battery cathode materials, in particular to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Environmental pollution and fossil energy depletion are becoming more and more serious, and lithium-ion batteries with long cycle life and high energy density are considered to be 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 due to its high specific capacity (1675mA h g -1 ) and energy density (2600W h·kg -1 ) has 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 batteries is constrained: (i) the insulati...

Claims

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Application Information

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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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