Silylene composite material for lithium ion battery and preparation method of silylene composite material

A lithium-ion battery and composite material technology, which is applied in the field of silicene composite materials and its preparation, can solve the problems of high expansion rate, low expansion rate, and high volume expansion rate of the negative electrode, and achieve low production cost, improved stability, and high charge. The effect of discharge rate

Active Publication Date: 2022-03-11
陕西晶泰新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention focuses on the problem that the expansion rate of the silicon-based negative electrode of the lithium-ion battery is too high, and provides a silicene composite material suitable for the lithium-ion battery and a preparation method thereof. A high-performance new negative electrode material obtained by coating pyrolytic carbon with a carbon nitride matrix, which fundamentally solves the problem of high volume expansion during charge and discharge, while taking into account high specific volume, long cycle, low expansion, etc. Excellent electrochemical performance

Method used

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  • Silylene composite material for lithium ion battery and preparation method of silylene composite material
  • Silylene composite material for lithium ion battery and preparation method of silylene composite material
  • Silylene composite material for lithium ion battery and preparation method of silylene composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Preparation of High Performance Composite Anode Materials

[0032] (1) Add 8g melamine and 1.25g LiOH·H to the beaker 2 O and 60 g of deionized water were stirred for 1 h, transferred to a tetrafluoroethylene-lined stainless steel autoclave at 160 ° C for 24 h, the product was washed with de-ionized water for 5 times, and then calcined at 550 ° C under nitrogen to obtain lithiated graphitized carbon nitride ;

[0033] (2) Take 0.6g of graphitized carbon nitride, 0.1g of sodium stearate plus 20ml of ethanol and water (mass ratio 5:1) in the mixed solvent of step 1 and stir for 1h, then ultrasonically disperse for 1h;

[0034] (3) Add 0.8 g of silicene nanosheets and 0.1 g of polydiallyldimethylammonium chloride to a mixed solvent of 20 ml of ethanol and water (mass ratio 5:1), and then sonicate for 1 hour, then slowly add the Post slurry stirring;

[0035] (4) Add 1.2 g of chitosan to the slurry in step 3 and stir for 30 minutes, then spray dry to obtain the negative ...

Embodiment 2

[0042](1) Add 8g of dicyandiamide, 1.25g of lithium carbonate and 60g of deionized water into a beaker and stir for 1 hour, transfer to a tetrafluoroethylene-lined stainless steel autoclave at 160°C for 24 hours, and wash the product with deionized water for 5 times Then calcined at 550°C under air to obtain lithiated graphitized carbon nitride;

[0043] (2) Take 0.6g of lithiated graphitized carbon nitride in step 1, 0.1g of sodium stearate plus 20ml of ethanol and water (mass ratio 5:1) in a mixed solvent and stir for 1h, then ultrasonically disperse for 1h;

[0044] (3) Add 0.8 g of silicene nanosheets and 0.1 g of hexadecyltrimethylammonium bromide to a mixed solvent of 20 ml of ethanol and water (mass ratio 5:1), and then sonicate for 1 h, then slowly add the slurry in step 2 After stirring;

[0045] (4) Add 0.8 g of phenolic resin to the slurry in step 3 and stir for 30 minutes, then stir and dry at 75°C to obtain the negative electrode material precursor;

[0046] (5)...

Embodiment 3

[0050] (1) Add 8g melamine and 1.25g LiOH·H to the beaker 2 O and 60 g of deionized water were stirred for 1 h, transferred to a tetrafluoroethylene-lined stainless steel autoclave at 160 ° C for 24 h, the product was washed with de-ionized water for 5 times, and then calcined at 550 ° C under nitrogen to obtain lithiated graphitized carbon nitride ;

[0051] (2) Take 0.6g of lithiated graphitized carbon nitride, 0.1g of sodium dodecylbenzenesulfonate and 20ml of ethanol in step 1 and stir for 1h, then ultrasonically disperse for 1h;

[0052] (3) Add 0.8 g of silicene nanosheets and 0.1 g of polydiallyldimethylammonium chloride to 20 ml of ethanol, then sonicate for 1 hour, slowly add the slurry in step 2 and stir;

[0053] (4) Add 0.8 g of polyvinylpyrrolidone to the slurry in step 3 and stir for 30 minutes, then spray dry to obtain the negative electrode material precursor;

[0054] (5) The product in step 4 is calcined and carbonized at a high temperature of 700°C for 5h ...

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Abstract

The invention relates to a composite microsphere based on a two-dimensional nano silylene sheet, graphitized carbon nitride and a coated carbon material and a preparation method of the composite microsphere, the material is of a pomegranate-like core-shell structure, the diameter is 5-20 microns, and the composite microsphere is mainly applied to the field of lithium ion battery negative electrodes. The preparation method comprises the following steps: 1) performing hydrothermal reaction on a carbon-nitrogen-containing organic material in alkali liquor, and calcining to obtain lithiated graphite phase carbon nitride; 2) uniformly and tightly compounding the silylene nanosheet and graphite phase carbon nitride in a solvent environment through an electrostatic self-assembly process; and 3) adding a carbon precursor for coating, and carrying out high-temperature calcining forming. The composite microsphere prepared by the preparation method disclosed by the invention is beneficial to the unique structure and valence bond form of the silylene nanosheet, the defect that the expansion rate of a silicon-based negative electrode material is too high is fundamentally overcome, and the synergistic effect of silylene and graphite-phase carbon nitride is fully utilized, so that the novel negative electrode material has the advantages of high specific capacity, long cycle life and the like; and the preparation process is simple, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and chemical power sources, and in particular relates to a silicene composite material applied in the field of negative electrode materials of lithium ion batteries and a preparation method thereof. Background technique [0002] New lithium-ion secondary batteries are one of the hot spots in the development of new energy fields, and have become the most important power source for electric vehicles. Among them, the negative electrode material is one of the four major raw materials of lithium batteries, which plays a very important role in the performance and safety of lithium batteries. At present, most commercial lithium-ion batteries use graphite-based negative electrodes, and their specific capacity is above 360mA / g, which is close to the theoretical specific capacity (372mAh / g), which cannot meet the needs of future development of lithium-ion batteries. [0003] Silicon-based mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/36H01M4/58H01M4/60H01M4/04H01M10/0525
CPCH01M4/136H01M4/0471H01M4/1397H01M4/366H01M4/60H01M4/58H01M2004/027H01M10/0525Y02E60/10
Inventor 张大鹏贾冬梅李长海
Owner 陕西晶泰新能源科技有限公司
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