Preparation process of silicon-carbon anode materials: comparison and application of mechanical bead

With the rapid development of the new energy industry, lithium-ion batteries, as their core components, have become the key to improving their performance.

Silicon-carbon anode materials have become a hot topic of current research due to their high specific capacity and good cycle performance.

As a pioneer in this field, Boyee provides two mainstream processes for preparing silicon-carbon anode materials: mechanical bead milling and CVD.

This article will analyze these two processes in depth and compare their advantages and disadvantages.

01

Mechanical bead milling process analysis

Mechanical bead milling is a traditional process for preparing silicon-carbon anode materials, the core of which lies in the preparation of nano-silicon.

The process includes steps such as feeding, mixing, wet grinding, spray drying, coating, sintering, crushing, demagnetization and packaging.

Among them, wet grinding is the key link. Through the grinding action of the sand mill, the silicon material is ground to the nano level, thereby achieving a uniform mixture of silicon and carbon.

The advantage of this method is that the process is relatively mature, the equipment investment is small, and it is suitable for large-scale production.

However, the mechanical bead milling method also has some shortcomings. Since silicon particles tend to agglomerate during the milling process, the material's cyclic performance is affected.

In addition, the utilization rate of silane in this method is relatively low, resulting in a certain waste of resources.

02

Analysis of CVD Process

CVD (CVD) is an advanced process for preparing silicon-carbon anode materials.

The process achieves efficient preparation of silicon-carbon materials through steps such as feeding, metering bin, CVD, coating in a coating furnace, cooling bin, demagnetization and packaging.

Among them, CVD is the core link. The gaseous silicon source is deposited on the substrate to form a nano-silicon layer, achieving a uniform composite of silicon and carbon.

Compared with mechanical bead milling, the CVD method has significant advantages. First of all, because the silicon crystal particles are small and there is no agglomeration problem, the prepared silicon carbon anode material has excellent cycle performance.

Secondly, this method has a higher utilization rate of silane and effectively reduces production costs.

In addition, the CVD method can also achieve precise control of silicon-carbon materials, providing strong support for the preparation of high-performance lithium-ion batteries.

03

Process comparison and application prospects

From the analysis of the above two processes, it can be seen that the mechanical bead milling method and the CVD method have their own characteristics.

The mechanical bead milling method is suitable for large-scale production and has low investment costs, but it has shortcomings in material performance and silane utilization.

Although the CVD method requires a large investment in equipment, the silicon-carbon anode material prepared by it has excellent performance, high silane utilization rate, and greater development potential.

With the continuous development of the new energy industry and the increasing requirements for the performance of lithium-ion batteries, the application prospects of CVD method in the preparation of silicon-carbon anode materials will be broader.

As a leading company in this field, Boyee will continue to delve deeper into the preparation process of silicon-carbon anode materials , provide customers with better-quality and more efficient solutions, and promote the sustainable development of the new energy industry.