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Application of nitrogen-doped carbon-coated Co and/or Co3ZnC composite material in preparation of lithium-sulfur battery diaphragm

A technology of nitrogen-doped carbon and composite materials, which is applied in the direction of lithium batteries, carbon preparation/purification, carbon compounds, etc., can solve the problems of poor affinity and not enough to effectively inhibit the shuttle effect of polysulfides, and achieve novel structures and improved Electrochemical performance, the effect of simple synthesis process

Pending Publication Date: 2021-04-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the poor affinity between nonpolar carbon materials and polar polysulfides is not enough to effectively inhibit the shuttling effect of polysulfides during cycling.

Method used

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  • Application of nitrogen-doped carbon-coated Co and/or Co3ZnC composite material in preparation of lithium-sulfur battery diaphragm
  • Application of nitrogen-doped carbon-coated Co and/or Co3ZnC composite material in preparation of lithium-sulfur battery diaphragm
  • Application of nitrogen-doped carbon-coated Co and/or Co3ZnC composite material in preparation of lithium-sulfur battery diaphragm

Examples

Experimental program
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Effect test

preparation example Construction

[0042] (2) Preparation of positive pole piece: 25% super P and 75% sublimated sulfur are fully ground in an agate mortar for 15 minutes, then placed in a stainless steel reaction kettle, and then placed in an oven at 155°C for 10h, the reaction is over Get super P-S composite. Put 80% super P-S, 10% super P and 10% PVDF in an agate mortar, and use N-methylpyrrolidone (NMP) as a solvent to thoroughly grind for 30 minutes, and then apply the resulting slurry evenly with a doctor blade on aluminum foil. After fully drying, the obtained pole pieces were cut into discs with a diameter of 14 mm.

[0043] (3) Assembly of button cell: the following operations were performed in a glove box filled with argon. The assembly of CR2025 button cell is respectively using lithium sheet as negative electrode, super P-S as positive electrode, PP / nitrogen-doped carbon-coated cobalt-zinc composite material as diaphragm and LITFIS electrolyte (1.0M LiTFSI in DOL:DME=1: 1Vol%with 1.0%LiNO 3 , Su...

Embodiment 1

[0046] Nitrogen-doped carbon-coated Co in this example 3 ZnC composite Co 3 The preparation method of ZnC@NC, the specific steps are as follows:

[0047] 1gPluronic F-127, 2g dicyandiamide, 0.1303g Co(NO 3 ) 2 6H 2 O and 0.3994g Zn(NO 3 ) 2 6H 2 O was fully dissolved in water in turn, and after continuing to stir overnight, the solution was placed in an oil bath at 80°C, and the water was dried, and then placed in an oven at 80°C to continue drying. Finally, the dried samples were placed in a tube furnace under N 2 Under the protection of the atmosphere, the temperature was raised to 700°C at a rate of 3°C / min, and the sample obtained after high-temperature carbonization for 1 hour was Co 3 ZnC@NC.

[0048] Co in this example 3 The XRD pattern of ZnC@NC is as follows figure 1 Shown, Co 3 There are three main peaks in the XRD diffraction pattern of ZnC@NC composites, and the diffraction peaks at 41.90°, 48.79° and 71.48° correspond to Co 3 (111), (200) and (220) c...

Embodiment 2

[0051] Nitrogen-doped carbon-coated Co / Co in this embodiment 3 ZnC Composite Co / Co 3 The preparation method of ZnC@NC, the specific steps are as follows:

[0052] 1gPluronic F-127, 2g dicyandiamide, 0.1303g Co(NO 3 ) 2 6H 2 O and 0.2663g Zn(NO 3 ) 2 6H 2 O was fully dissolved in water in turn, and after continuing to stir overnight, the solution was placed in an oil bath at 80°C, and the water was dried, and then placed in an oven at 80°C to continue drying. Finally, the dried samples were placed in a tube furnace under N 2 Under the protection of the atmosphere, the temperature was raised to 700°C at a rate of 3°C / min, and the sample obtained after high-temperature carbonization for 2 hours was Co / Co 3 ZnC@NC.

[0053] Co / Co in this example 3 The XRD pattern of ZnC@NC is as follows figure 1 Shown, Co / Co 3 There are six main peaks in the XRD diffraction pattern of ZnC@NC composites, among which the diffraction peaks at 41.90°, 48.79° and 71.48° correspond to Co 3...

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Abstract

The invention belongs to the field of nano materials and lithium-sulfur batteries, and discloses an application of a nitrogen-doped carbon-coated Co and / or Co3ZnC composite material in preparation of a lithium-sulfur battery diaphragm. The preparation method comprises the following steps: dissolving Pluronic F-127 in water, adding a carbon source dicyandiamide, adding a positive bivalent cobalt salt and a positive bivalent zinc salt, performing further stirring, evaporating water to dryness to obtain a solid compound, and carrying out high-temperature carbonization under the protection of N2 gas. In the process, dicyandiamide is carbonized to obtain N-doped carbon, reducing substances such as carbon monoxide, carbon dioxide, nitric oxide and carbon generated in the carbonization process of dicyandiamide can reduce and carbonize cobalt and zinc to obtain Co or Co3ZnC, and a target product is obtained after the reaction is completed. The N-doped carbon-coated Co and / or Co3ZnC composite material is used as a diaphragm modification material and is coated on a commercial diaphragm by a scraper method, and the electrochemical performance of the lithium-sulfur battery can be effectively improved when the N-doped carbon-coated Co and / or Co3ZnC composite material is applied to the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of nanomaterials and lithium-sulfur batteries, in particular to a nitrogen-doped carbon-coated Co and / or Co 3 Application of ZnC composite materials in the preparation of lithium-sulfur battery separators. Background technique [0002] With the increasing global energy demand and the gradual depletion of fossil energy, human beings urgently need to develop and utilize clean energy such as wind energy, solar energy and geothermal energy. However, when the proportion of photovoltaic and wind power integrated into the existing power grid exceeds 10%, it will have a significant impact on the local power grid. Therefore, the research and development of efficient and safe power storage technology is the key to large-scale and efficient use of these energies. Compared with the currently used lead-acid batteries, nickel-metal hydride batteries, and lithium-ion battery energy storage systems, lithium-sulfur batteries are cons...

Claims

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Application Information

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IPC IPC(8): H01M50/431H01M50/449H01M50/403H01M10/052C01B32/90C01B32/05
CPCY02E60/10
Inventor 蔡欣王梦蕊周训富方岳平
Owner SOUTH CHINA AGRI UNIV
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