Quantitative analysis of the structural evolution in Si anode via multi-scale image reconstruction

To probe the structure evolution of Si anode during cycling and explore its failing mechanism, a 3D image reconstruction technology is firstly employed to visualize Si anode in both electrode and particle levels. The FIB-SEM analysis results indicates that FEC additive leads to the formation of a stable SEI during early stage of cycling, resulting in effective suppression of free volume expansion and particle pulverization in Si anodes, and further improves the cycle life. This new technique could be further applied for the study of other electrode materials with similar volume expansion issues.