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Silicon carbon negative electrode material and its preparation method and application

A negative electrode material, silicon carbon technology, applied in battery electrodes, batteries, structural parts, etc., can solve the problems affecting the bonding stability of nano-silicon and graphene sheets, uneven distribution of silicon, agglomeration, etc., to suppress expansion and simplify operation. , the effect of good charge and discharge performance

Active Publication Date: 2021-11-19
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 the distribution of silicon in the carbon source is uneven, and agglomeration occurs. Therefore, during the charge and discharge process, the volume expansion of silicon will increase. Affect the combination stability of nano-silicon and graphene sheet
[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 its preparation method and application
  • Silicon carbon negative electrode material and its preparation method and application
  • Silicon carbon negative electrode material and its preparation method and application

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preparation example Construction

[0054] 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

[0061] 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

[0064] 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.

[0065] The silicon carbon negative ...

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Abstract

The invention discloses a silicon-carbon negative electrode material and its preparation method and application. The method comprises: adding silicon powder and a solid carbon source into a V-type mixer for mixing; adding a liquid carbon source into the V-type mixer in the form of spraying, After further mixing, the mixture is obtained; the mixture is sent to a high-speed crusher, and the liquid carbon source is drawn into a film and coated on the surface of the mixture of silicon powder and solid carbon source to obtain a mixture containing a coating layer; the mixture containing the coating layer Baking is carried out under an inert atmosphere, so as to obtain a silicon-carbon negative electrode material. This method can be used to prepare a silicon-carbon negative electrode material with uniform dispersion of silicon and carbon and a stable composite, and can inhibit the expansion of silicon during charge and discharge, and has better performance than the silicon-carbon negative electrode material prepared by the existing preparation process. Excellent charge and discharge performance, cycle performance and charge and discharge rate performance, and the preparation method is simple to operate, abandons the drying process of the traditional preparation process, is conducive to industrial production and reduces production costs.

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 Patents(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