Cracking resistance and electrochemical performance of silicon anode on binders with different mechanical characteristics

Abstract

Silicon anodes in lithium-ion batteries have attracted attention for their exceptionally high theoretical capacity. However, their practical application is hindered as the capacity fades quickly due to huge volume changes of silicon particles during the lithiation/delithiation process. In order to reduce volume changes, polyvinylidene fluoride, gellan gum, and pullulan modified gellan gum were introduced in the electrode as a binder. This work focuses on understanding the role of these binders on the mechanical behavior and cracking resistance of silicon electrodes during electrochemical cycling. A binder with moderate elasticity can be used to extend the capacity lifetime of a silicon anode.