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Silicon-carbon negative electrode material and preparation method and application thereof

A negative electrode material, silicon carbon technology, applied in the field of silicon carbon negative electrode materials and its preparation, can solve the problems of uneven distribution of silicon, affecting the stability of the combination of nano silicon and graphene sheets, agglomeration, etc., and achieve the reduction and suppression of industrial production The effect of expansion and good charge and discharge performance

Active Publication Date: 2020-05-05
内蒙古信敏惠纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing silicon-carbon composite materials are mostly prepared by the liquid phase method. The liquid phase method not only involves subsequent processes such as drying, but also has uneven distribution and agglomeration of silicon in the carbon source. Therefore, the volume of silicon expands during the charging and discharging process. Will affect the stability of the combination of nano-silicon and graphene sheets
[0005] Therefore, the preparation process of the existing silicon-carbon anode materials needs to be further improved

Method used

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  • Silicon-carbon negative electrode material and preparation method and application thereof
  • Silicon-carbon negative electrode material and preparation method and application thereof
  • Silicon-carbon negative electrode material and preparation method and application thereof

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preparation example Construction

[0055] According to the method for preparing a silicon-carbon negative electrode material according to an embodiment of the present invention, by adding silicon powder and solid carbon source to a V-shaped mixer and mixing, it is beneficial to uniformly disperse the silicon powder and solid carbon source; further, by spraying Add liquid carbon source to the V-type mixer and mix it with evenly mixed silicon powder and solid carbon source, which is conducive to uniform dispersion of liquid carbon source, silicon powder and solid carbon source, and add liquid carbon source in the form of spray It can avoid the agglomeration of particles in the mixture, and is also conducive to improving the dispersion of the liquid carbon source in the mixture, providing conditions for the subsequent uniform film formation on the surface of silicon powder and solid carbon source; by combining liquid carbon source, silicon powder and solid carbon source The mixture is sent to the high-speed crusher...

Embodiment 1

[0062] Take 1.5g of silicon powder with a particle size of 150nm, 5g of graphene with a maximum size of 5μm, and 5g of flake graphite with a maximum size of 5μm and add them to a 150-type V-type mixer and mix for 1 hour at a speed of 10r / min, and then spray 5g of Glucose solution (containing 0.5g glucose) is added in the V-shaped mixer in the form of spraying, and continues to mix for 2 hours at a speed of 10r / min, and the resulting mixture is added to the high-speed crusher at a speed of 300mg / min, and the internal pressure of the high-speed crusher Glucose is coated on the surface of the mixture of silicon powder, graphene and flake graphite by wire drawing to form a film, and the mixture containing the coating layer is roasted in a nitrogen atmosphere, specifically, at a heating rate of 5°C / min The temperature was raised to 600° C. and kept at this temperature for 120 minutes to obtain a stable silicon-carbon negative electrode material. Its scanning electron microscope pic...

Embodiment 2

[0065] Take 0.5g of silicon powder with a particle size of 80nm, 5g of graphite with a maximum size of 12μm, and 5g of expanded graphite with a maximum size of 12μm and add them to a 150-type V-type mixer and mix at a speed of 12r / min for 2.5h, and then spray 4g of Starch solution (containing 1.2g starch) is added in the V-shaped mixer in the form of spraying, and continues mixing for 1 hour at a speed of 12r / min, and the resulting mixture is added to a high-speed crusher at a speed of 600mg / min, and the internal pressure of the high-speed crusher 0.4mPa, the starch is drawn into a film and coated on the surface of the mixture of silicon powder, graphene and graphite flakes, and the mixture containing the coating layer is roasted in a nitrogen atmosphere, specifically, at a heating rate of 2°C / min The temperature was raised to 800° C. and kept at this temperature for 80 minutes to obtain a stable silicon-carbon negative electrode material.

[0066] The silicon carbon negative ...

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Abstract

The invention discloses a silicon-carbon negative electrode material and a preparation method and application thereof. The method comprises the steps of adding silicon powder and a solid carbon sourceinto a V-shaped mixer for mixing; adding a liquid carbon source into the V-shaped mixer in a spraying form, and further mixing to obtain a mixture; sending the mixture to a high-speed crusher, drawing a liquid carbon source into a film to coat the surface of the mixture of the silicon powder and the solid carbon source, and obtaining a mixture containing a coating layer ; and roasting the mixturecontaining the coating layer in an inert atmosphere to obtain the silicon-carbon negative electrode material. By adopting the method, the silicon-carbon negative electrode material with uniformly dispersed silicon and carbon and stable compounding can be prepared, and the expansion of silicon during charging and discharging processes can be suppressed. Compared with a silicon-carbon negative electrode material prepared by adopting an existing preparation process, the silicon-carbon negative electrode material prepared by adopting the preparation process has better charge-discharge performance, cycle performance and charge-discharge rate performance. The preparation method is simple to operate. A drying process of a traditional preparation process is abandoned. Industrial production is facilitated, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials and their applications. Specifically, the invention relates to silicon-carbon negative electrode materials and their preparation methods and applications. Background technique [0002] With the continuous development of automobiles and power storage products, lithium-ion batteries with high specific energy have become the primary research topic of various scientific research institutions. At present, the negative electrode of lithium-ion batteries is mostly graphite, and its actual discharge specific capacity is close to its theoretical value of 372mAh / g, and the layered structure of graphite is easy to peel off when the number of cycles is large, which limits the specific energy and specific energy of graphite as the negative electrode of lithium batteries. Further performance improvements. However, the positive electrode has diversified development, including lithium iron p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/366H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 陈玉成王俊美郝胐袁伟
Owner 内蒙古信敏惠纳米科技有限公司
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