In this Si-Carbon composite, the Si amount is controlled lower than 10% by weight. Si is an active component that contributes to the high lithium storage capacity at the same time the graphite/amorphous carbon matrix significantly buffers the volume expansion of Si, improves electronic conductivity, and stabilizes the SEI layers of the Si particles. This is a commercial product used in pouch cells and cylindrical cells.
With the increase of Si content in the composite, the capacity is increased while the cycling performance gets worse.
- 0.5%~2% CNT can be added to the negative electrode formula to improve the cycling performance
- Increasing the amount of electrolyte additive is helpful to improve the poor quality of SEI film on silicon anode
- The use of some special binder (such as PAA-based binder) can effectively improve the electrochemical performance of the material (such as cycling performance).