Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation device and method of silicon composite material

A technology of silicon composite material and preparation device, applied in metal material coating process, electrode manufacturing, vapor deposition manufacturing, etc., can solve the problems of poor controllability of coating thickness, easy formation of bubbles, and different effects of fluidization quality improvement. , to achieve the effect of improving cycle performance and rate performance, and improving uniformity

Active Publication Date: 2022-06-21
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing coating methods are relatively complicated, the cost is high, and it is not easy to prepare on a large scale, and the electrochemical performance of the prepared silicon composite material needs to be further improved.
[0004] Using the fluidized bed chemical vapor deposition method, the highly fluidized nano-silicon material in the reactor and the efficient heat and mass transfer between the reaction gas and the silicon particles are all helpful to improve the uniformity of the coating layer and improve the silicon composite. However, during the reaction process, the silicon material particles are easy to agglomerate, and the reaction gas is easy to form bubbles in contact with the agglomerates, which affects the gas-solid contact efficiency and the coating effect of the silicon material particles, resulting in a controllable thickness of the coating layer. Poor, poor uniformity
The fluidization quality can be effectively improved by installing internal components in the fluidized bed reaction unit. However, internal components with different structures have different effects on the fluidization quality. How to further improve the fluidization quality and improve the coating uniformity of silicon materials is the key One of the problems that technical personnel in the field continue to pay attention to

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation device and method of silicon composite material
  • Preparation device and method of silicon composite material
  • Preparation device and method of silicon composite material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] The second aspect of the present invention provides a preparation method of a silicon composite material, which is carried out in any of the above-mentioned devices, and includes the following steps:

[0055] The silicon material is placed at the bottom of the reaction unit 2 near the gas inlet 1, and the gas is input from the gas inlet 1 into the reaction unit 2, and the gas entering the reaction unit 2 undergoes a cracking reaction, and promotes the fluidization of the silicon material, while the particle agglomerates and The bubbles formed by the gas are gradually broken by the crushing unit 3 to form a high-quality gas-solid fluid state. The high-quality fluidized silicon material particles react with the cracked elemental substance, and coat the surface of the silicon material to form a silicon composite material, while the The unreacted gas flows out from the gas outlet 6 after being separated by the separation baffle 4 and the cyclone 5, while the particulate matt...

Embodiment 1

[0061] This embodiment adopts the figure 1 The device shown is provided with 2 crushing units, each crushing unit includes 4 crushing members, and the included angle α=90° between the crushing member in the first crushing unit and the crushing member in the second crushing unit, and the crushing member has figure 2 The structure shown includes a first upper baffle and a first lower baffle that are connected to each other and a second upper baffle and a second lower baffle that are connected to each other. The first upper baffle and the second upper baffle are arranged in parallel, The angle between the first lower baffle and the second lower baffle is 60°; the guide tube has a heat exchange function, and the ratio of the total area of ​​the upper through hole 16 to the total area of ​​the first upper baffle and the second upper baffle is 6%; the ratio of the total area of ​​the lower through holes 15 to the total area of ​​the first lower baffle and the second lower baffle is...

Embodiment 2

[0066] The device used in this embodiment can refer to Embodiment 1, the difference is that: the ratio of the total area of ​​the upper through holes to the total area of ​​the first upper baffle and the second upper baffle is 8%; The ratio of the total area of ​​the first baffle and the second lower baffle was 2%. The vertical distance between the first upper baffle and the second upper baffle is 180mm; the height of the first upper baffle and the second upper baffle is 180mm.

[0067] The reaction temperature in the fluidized bed reaction device is 850°C, the reaction pressure (gauge pressure) is 0.02Mpa, the carbon source is a mixture of methane, ethylene and propylene, and nitrogen source and inert gas are introduced at the same time, and the average particle size of the silicon-based material is 100nm .

[0068] The content of nitrogen doping in the silicon composite material was detected. After testing, the nitrogen doping content was 2.08wt%, indicating that nitrogen w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation device and method of a silicon composite material. The invention provides a preparation device of a silicon composite material. The device comprises a reaction unit, a gas inlet formed in the bottom of the reaction unit and a gas outlet formed in the top of the reaction unit, at least one crushing unit is arranged in the reaction unit, each crushing unit comprises a plurality of crushing components which are arranged in parallel, and each crushing component comprises a first baffle, a second baffle and a flow guide pipe. The preparation device and method provided by the invention can effectively improve the uniformity degree of the coating layer on the surface of the silicon material, improve the cycle performance and rate capability of the lithium ion battery, and can be used for producing the silicon composite material.

Description

technical field [0001] The invention relates to a preparation device and method of a silicon composite material, and relates to the technical field of battery materials. Background technique [0002] In recent years, Li-ion batteries have been regarded as the most promising energy storage devices due to their high operating voltage and energy density, long cycle life, and good safety performance. With the rapid development of human society, portable chargers, electric vehicles and artificial intelligence have put forward higher requirements in terms of energy density, cycle life and safety performance. However, the low capacity of graphite, the anode material of traditional lithium-ion batteries, limits the improvement of the capacity of lithium-ion batteries. Compared with graphite, silicon exhibits more than 10 times the theoretical capacity, and the theoretical capacity is close to 4000mAh / g, making it a Candidate materials for improving the capacity of lithium-ion batte...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/38H01M4/62H01M10/0525C23C16/442C23C16/26
CPCH01M4/0428H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525C23C16/442C23C16/26C23C16/4417H01M2004/027Y02E60/10
Inventor 马新龙宋红梅高金森
Owner CHINA UNIV OF PETROLEUM (BEIJING)