Silicon carbon composite material as a future negative electrode material, its theoretical gram capacity of about 4200 mAh/g or more, more than 10 times higher than the graphite negative electrode 372 mAh/g, its industrialization, will greatly enhance the capacity of the battery.

Now the main problems of silicon carbon composite materials are:

During charging and discharging, the volume expansion can reach 300%, which will cause the silicon material particles to powder, resulting in the loss of material capacity. At the same time, the liquid absorption capacity is poor.

Poor cycle life. At present, the above problems are solved by means of silicon powder nanocrystallization, silicon carbon coating and doping, and some enterprises have made some progress.

Related R & D enterprises:

At present, major material manufacturers are developing silicon carbon composite materials, such as BTR, Snow, Star City Graphite, Huzhou Chuangya, Shanghai Shanshan, Huawei, Samsung and so on. Domestic negative material enterprises research and development of silicon-based materials is: most of the material manufacturers are still in the research and development stage, at present only Shanghai Shanshan has entered the pilot production stage.