SiO and Silicon Graphite Composite Anode Materials for Lithium-ion Batteries
Abstract
Lithium-ion batteries have been widely used in portable digital devices and electric vehicles. Silicon based anode materials including SiO and silicon graphite composites have attracted much attention due to their high volumetric capacity compared to conventionally used graphite. However, huge volume changes of Si-based materials can result in particle fracture and thick solid electrolyte interphase formation, leading to battery failure. One strategy of overcoming this is to utilize special binders that can maintain connection among electrode components and protect the active from side reactions. Another strategy is to design composite materials that include a Si component that is isolated from contacting the electrolyte. This thesis explores both these strategies.