Silicon carbon anode material is the development focus of lithium battery anode material

Lithium battery manufacturers predict that silicon-carbon cathode materials are the key to the development of lithium battery cathode materials. Lithium battery manufacturers speculate that silicon-carbon cathode materials are the key to opening lithium battery cathode materials. At present, the production of silicon and carbon materials in my country is basically in excess of self-use, and the prices are relatively stable and cost-effective. As a basic material, silicon-carbon material has entered people's daily life, and is gradually changing the communication and lifestyle of human society in the category of new energy. Lithium battery manufacturers speculate that silicon-carbon cathode materials are the key to opening up lithium battery cathode materials. Silicon-based anode materials have a high theoretical lithium storage capacity and will replace traditional graphite anode materials and become one of the most promising anode materials for next-generation lithium batteries. . As the cathode material, silicon is easily decomposed by the electrolyte due to its high volume expansion rate and low conductivity, and it is prone to high-frequency corrosion. These shortcomings limit its openness in commercial applications. Carbon has the advantages of high stability, good conductivity, low price, and a wide range of sources, but the theoretical storage capacity of lithium is relatively low, only about 1/10 of that of silicon. In order to solve the problems in silicon materials for lithium batteries, the first choice is to use silicon-carbon composite methods to prepare silicon-carbon composite cathode materials with high energy storage, good conductivity, and excellent cycle performance. At present, the total output of silicon-carbon cathode materials is less than 1% of lithium cathode materials. However, with the expansion of lithium battery manufacturers and the rise of new companies, it is expected that silicon carbon materials will officially enter the market in large numbers in recent years. Silicon is the highest lithium battery cathode material that mankind has now stopped discovering. The negative electrode material is one of the most potential. The theoretical specific capacity of silicon material is high. After silicon carbon is satisfied, it can advance more than 200%, and the energy density of portable power supply capacity is satisfied. Degree, and the satisfaction of hybrid electric vehicles, the demand for high-power lithium batteries. The difficulty in the research of silicon-carbon cathode materials is the cycle life and safety problems caused by volume expansion. In order to deal with these problems, new problems related to preparation and cost will appear. Silicon is a semiconductor, and its conductivity is much worse than that of graphite, which leads to a large degree of irreversibility in the process of lithium ion de-embedding, thereby reducing its initial Coulomb power. Its direct impact also makes the cycle life of lithium batteries worse. Therefore, the use of silicon carbon anode requires higher technical barriers. During the charging and discharging process, the volume of silicon will expand by 100%-300%, and the continuous shortening of the expansion will form silicon carbon cathode material powder, which will seriously affect the battery life. The expansion of silicon will cause a lot of stress inside the battery, which will cause the pole to knead, and then the pole will crack; it will also cause the internal porosity of the battery to decrease, promote the separation of metal lithium, and affect the safety of the battery. By controlling the carbon to guess the content of silicon and reducing the volume of silicon to nanometers, the problem of volume expansion can be solved. Or change the structure and shape of graphite to end the best match between carbon and silicon; maybe you can cover silicon with other materials to promote recovery after expansion; there are some ways to reduce a lot of expansion with silicon by choosing more suitable electrode materials Related questions. Although there is no perfect way to deal with the expansion of lithium embedded in silicon particles and consumption of lithium sources and electrolytes continue to break the rise of the SEI film, some nano-silicon-carbon anode materials have been used by core companies after years of hard work, domestic and foreign companies and Research institutes. The industrialization of domestic silicon-carbon anodes is still in its infancy, but the technological progress is very significant, and the development and processing of its silicon-carbon anodes has been at the leading domestic level. It is estimated that the market space of silicon carbon cathode materials in 2020 is about 5 billion, and the market concentration is extremely high. As a new type of lithium battery cathode material, silicon carbon cathode is more efficient than graphite anode in terms of energy density of advanced batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: OEM cooperation between lithium battery companies