title: Exotic reaction front migration and stage structure in lithiated silicon nanowires.
abstract: Nanostructured silicon anodes, which possess extremely high energy density and accommodate large strain without pulverization, have been developed rapidly for high-power lithium ion batteries. Here, using in situ transmission electron microscopy, the lithiation behavior of silicon nanowires with diameters smaller than 60 nm was investigated. The study demonstrated a direct dependence of the self-limiting lithiation on the pristine diameter. A "punch-through" lithiation process at the core of nanowires with pristine diameters slightly larger than the self-limiting threshold is suggested to occur with the consequent formation of a stage structure. Our work demonstrates the crucial role of mechanical stress and local defects in determining the migration and geometry of the reaction front at the mesoscopic scale. This intriguing finding holds critical significance for the application of silicon nanostructures in high-power lithium ion batteries.
authors: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors: Lifen
authors: L
authors: Wang
authors: Donghua
authors: D
authors: Liu
authors: Shize
authors: S
authors: Yang
authors: Xuezeng
authors: X
authors: Tian
authors: Guangyu
authors: G
authors: Zhang
authors: Wenlong
authors: W
authors: Wang
authors: Enge
authors: E
authors: Wang
authors: Zhi
authors: Z
authors: Xu
authors: Xuedong
authors: X
authors: Bai