Silicon is the best candidate to replace graphite, the commercially used anode. The major motivation in using silicon as anode is because of its very large specific capacity of 4200 mAh g-1, compared to 372 mAh g-1 capacity of graphite. Besides that, it is the second most abundant element on earth, potentially cheap, and has relatively low redox potential. However, silicon can experience large volume expansion up to 420% when lithitiated. It generates stress that cause negative effects such as structural integrity deterioration and disconnection between electrode and current collector. Therefore, silicon is highly potential material for replacing graphite anode, but measures must be taken to minimize the expansion effect. Currently, the utilization silicon potential is using nanoscale fabrication methods and modification of compositions and hierarchical structure.
|Date||:||15 September 2020|