Anisotropic Swelling and Fracture of Silicon Nanowires during Lithiation
Citations Over TimeTop 1% of 2011 papers
Abstract
We report direct observation of an unexpected anisotropic swelling of Si nanowires during lithiation against either a solid electrolyte with a lithium counter-electrode or a liquid electrolyte with a LiCoO(2) counter-electrode. Such anisotropic expansion is attributed to the interfacial processes of accommodating large volumetric strains at the lithiation reaction front that depend sensitively on the crystallographic orientation. This anisotropic swelling results in lithiated Si nanowires with a remarkable dumbbell-shaped cross section, which develops due to plastic flow and an ensuing necking instability that is induced by the tensile hoop stress buildup in the lithiated shell. The plasticity-driven morphological instabilities often lead to fracture in lithiated nanowires, now captured in video. These results provide important insight into the battery degradation mechanisms.
Related Papers
- → On the dynamics of necking and fragmentation—II. Effect of material properties, geometrical constraints and absolute size(2008)101 cited
- → Non-linear necking behaviour of S275 to S960 structural steels under monotonic tension(2022)10 cited
- → Necking of Q&P steel during uniaxial tensile test with the aid of DIC technique(2013)14 cited
- → Shear Viscosity of Model Mixtures by Nonequilibrium Molecular Dynamics. IV. Effect of Molecular Shape(2001)2 cited
- Necking of Q&P Steel during Uniaxial Tensile Test with the Aid of DIC Technique(2013)