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A kind of high-capacity silicon-carbon material for negative electrode of lithium battery and preparation method thereof

A silicon-carbon material, high-capacity technology, applied in the field of electrochemistry, can solve the problems of increasing production cost, weak binding force, reducing efficiency and product yield, etc., to achieve the effect of improving conductivity, reducing possibility, and improving stability

Active Publication Date: 2021-08-24
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two times of spray drying is conducive to the formation of a stable coating layer on the surface, but the bonding force between the internal silicon and graphite is weak. At the same time, two times of spray drying increases production costs and reduces efficiency and product yield

Method used

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  • A kind of high-capacity silicon-carbon material for negative electrode of lithium battery and preparation method thereof
  • A kind of high-capacity silicon-carbon material for negative electrode of lithium battery and preparation method thereof
  • A kind of high-capacity silicon-carbon material for negative electrode of lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this embodiment, the preparation method of the highly stable silicon-carbon negative electrode material for lithium batteries is as follows:

[0046] (1) Disperse 2g of nano-silicon in 100mL of ethanol, ultrasonically disperse and stir evenly, and add 10g of chitosan aqueous solution with a concentration of 10% drop by drop to obtain dispersion A;

[0047] (2) Disperse 0.05g of carbon nanofibers in 100mL of ethanol to obtain dispersion B;

[0048] (3) Disperse 4g of graphite intermediate in 100mL of ethanol, ultrasonically and stir evenly, and dropwise add 0.5g of amino polyether silicone with a concentration of 50% to obtain dispersion D;

[0049] (4) Add dispersion A, 0.5g of WD-50 with a concentration of 100%, and dispersion B to dispersion D dropwise at the same time, control the rotation speed at 500rad / min, and stir at 80°C for 12 hours to obtain dispersion E ;

[0050] (5) Let the dispersion E stand still for 2 hours, collect the lower layer slurry, filter i...

Embodiment 2

[0053] In this embodiment, the preparation method of the highly stable silicon-carbon negative electrode material for lithium batteries is as follows:

[0054] (1) Disperse 5g of nano-silicon in 100mL of ethanol, ultrasonically disperse and stir evenly, and add 2g of 50% phytic acid aqueous solution drop by drop to obtain dispersion A;

[0055] (2) Disperse 0.1g of carbon nanotubes in 100mL of ethanol to obtain dispersion B;

[0056] (3) Disperse 5g of graphite intermediate in 100mL of ethanol, ultrasonically and stir evenly, and dropwise add 0.5g of WD-50 with a concentration of 100% to obtain dispersion D;

[0057] (4) Add dispersion A, 0.5g of WD-50 with a concentration of 100%, and dispersion B to dispersion D dropwise at the same time, control the speed at 1000rad / min, and stir at 60°C for 4 hours to obtain dispersion E ;

[0058] (5) Let the dispersion E stand still for 4 hours, pour off the supernatant to obtain the lower layer slurry, centrifuge it, dry it in vacuum ...

Embodiment 3

[0061] In this embodiment, the preparation method of the highly stable silicon-carbon negative electrode material for lithium batteries is as follows:

[0062] (1) Disperse 4g of nano-silicon in 100mL of isopropanol, ultrasonically disperse and stir evenly, and add 1.5g of 30% sucrose solution drop by drop to obtain dispersion A;

[0063] (2) Disperse 0.02g of carbon nanotubes in 100mL of isopropanol to obtain dispersion B;

[0064] (3) Disperse 2g of mesocarbon microsphere intermediate in 100mL of isopropanol, ultrasonically and stir evenly, and dropwise add 0.4g of KH550 with a concentration of 50% to obtain dispersion D;

[0065] (4) Add dispersion A, 0.4 g of KH550 with a concentration of 50%, and dispersion B to dispersion D dropwise at the same time, control the speed at 1500 rad / min, and stir at 40°C for 8 hours to obtain dispersion E;

[0066] (5) Let the dispersion E stand still for 3 hours, collect the slurry in the lower layer, dry it in a blast oven at 70°C for 4 ...

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Abstract

The invention provides a high-capacity silicon-carbon material for negative electrodes of lithium batteries and a preparation method thereof. The material is mainly prepared by liquid-phase self-assembly, and a porous structure with a conductive network is formed inside the material after carbonization, wherein nano-silicon is distributed in the material Inside, it is evenly combined with the carbon intermediate material, and at the same time, a uniform conductive agent is distributed around it to promote electron transmission. The outside of the material is covered with a uniform modification layer to achieve a dense structure and a uniform surface, which can buffer the expansion of the internal material , to avoid contact between nano-silicon and the electrolyte to improve the stability of the material. The process of the invention is novel, and the prepared silicon-carbon negative electrode material has the advantages of high first effect, good stability and the like, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a high-capacity silicon-carbon material for a negative electrode of a lithium battery and a preparation method thereof. Background technique [0002] With the rapid development of mobile electronic products and new energy vehicle industries, the market has put forward higher requirements for the energy density of batteries, and national policies have also vigorously promoted the development and application of high energy density batteries. [0003] The new energy industry will continue to develop rapidly in the future, which provides great opportunities for the development of power batteries, but also puts forward higher requirements. Anode materials play an important role in improving the performance of power batteries. The theoretical specific capacity of traditional graphite anodes is low, which can no longer meet the needs of high-energy-density lithium-ion batteries. Silicon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/052H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘艳侠刘凡曹相斌申长洁万爽阮晶晶陈仕谋张锁江
Owner 郑州中科新兴产业技术研究院
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