Shinkai Made a Breakthrough in New Silicon-carbon Anode Materials for Lithium Batteries

With the rise of smart electric cars, the research and development of battery technology has received increasing attention. Among them, the research of anode materials is particularly important, as it directly affects the performance and life of the battery. Currently, the most commonly used negative electrode material on the market is graphite, but with the popularity of electric vehicles, the performance of graphite can no longer meet the market demand. Therefore, people have started to research and develop new negative electrode materials, among which carbon and silicon materials are considered to be the most promising one.

Carbon and silicon anode material is a composite material composed of carbon and silicon, it has excellent electrochemical and mechanical properties, can significantly improve the energy density and cycle life of the battery, the advantages of carbon and silicon materials are mainly reflected in the following aspects.

1. High Energy Density

The theoretical specific capacity of silicon is more than 10 times that of graphite, and the composite material of silicon and carbon can make full use of the high capacity characteristics of silicon to achieve higher energy density.

2. Long Cycle Life

Carbon and silicon materials have better structural stability and capacity retention ability, which can achieve longer cycle life.

3. Fast Charging Performance

Carbon and silicon materials have excellent conductivity and ion transfer performance, which can achieve rapid charging and discharging.

4. Environmentally Sustainable

Carbon and silicon materials can be prepared through a variety of methods, with better controllability and scalability.

There are various methods for the preparation of silicon-carbon materials, including sol-gel method, high-temperature pyrolysis method, chemical vapour deposition (CVD) method and so on. Among the many silicon carbon anode material preparation methods, the silicon carbon anode material prepared by chemical vapour deposition (CVD) has received widespread attention because of its advantages of high charge/discharge efficiency, good cycle stability, low equipment requirements and suitability for industrial production.

At present, the core of the latest type of gas-phase deposition (CVD) silicon and carbon technology is to store silicon through the porous carbon structure, and the carbon particles with a porous structure similar to sponges are firstly manufactured with polymer materials, and then silane gas is passed into the pores of the porous carbon particles, so that the gas can be precipitated into silicon nanoparticles dispersed in the pores of the porous carbon through high-temperature pyrolysis.

The tail gas produced by silane deposition will entrain a part of carbon powder out of the fluidized bed, at this time, adding a high-temperature gas on-line blowback filter produced by Shinkai at the top of the fluidized bed can intercept 100% of the carbon powder in the tail gas to avoid product loss, at the same time, the purified tail gas can be reused, and what’s more, the Shinkai’s filter with large flux, low differential pressure, and good blowback effect can ensure that the pressure inside the fluidized bed is stable, which is important to ensure the stability of product quality and production efficiency. This is of great significance to ensure the stability of product quality and production efficiency. Through continuous optimization of product design, Shinkai has now become the preferred partner of China’s carbon and silicon anode enterprises. From small trial, pilot plant to large-scale device, Shinkai’s high temperature gas online blowback filters have been serving the customers with excellent performance and have won wide acclaim.